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692 lines
19 KiB
692 lines
19 KiB
; RUN: llc %s -o - -enable-shrink-wrap=true -ifcvt-fn-start=1 -ifcvt-fn-stop=0 -mtriple=thumb-macho \
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; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=ENABLE --check-prefix=ENABLE-V4T
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; RUN: llc %s -o - -enable-shrink-wrap=true -ifcvt-fn-start=1 -ifcvt-fn-stop=0 -mtriple=thumbv5-macho \
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; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=ENABLE --check-prefix=ENABLE-V5T
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; RUN: llc %s -o - -enable-shrink-wrap=false -ifcvt-fn-start=1 -ifcvt-fn-stop=0 -mtriple=thumb-macho \
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; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLE --check-prefix=DISABLE-V4T
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; RUN: llc %s -o - -enable-shrink-wrap=false -ifcvt-fn-start=1 -ifcvt-fn-stop=0 -mtriple=thumbv5-macho \
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; RUN: | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLE --check-prefix=DISABLE-V5T
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;
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; Note: Lots of tests use inline asm instead of regular calls.
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; This allows to have a better control on what the allocation will do.
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; Otherwise, we may have spill right in the entry block, defeating
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; shrink-wrapping. Moreover, some of the inline asm statements (nop)
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; are here to ensure that the related paths do not end up as critical
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; edges.
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; Also disable the late if-converter as it makes harder to reason on
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; the diffs.
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; Initial motivating example: Simple diamond with a call just on one side.
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; CHECK-LABEL: foo:
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;
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; Compare the arguments and jump to exit.
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; No prologue needed.
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; ENABLE: cmp r0, r1
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; ENABLE-NEXT: bge [[EXIT_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; CHECK: push {r7, lr}
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; CHECK: sub sp, #8
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;
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; Compare the arguments and jump to exit.
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; After the prologue is set.
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; DISABLE: cmp r0, r1
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; DISABLE-NEXT: bge [[EXIT_LABEL:LBB[0-9_]+]]
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;
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; Store %a in the alloca.
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; CHECK: str r0, [sp, #4]
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; Set the alloca address in the second argument.
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; Set the first argument to zero.
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; CHECK: movs r0, #0
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; CHECK-NEXT: add r1, sp, #4
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; CHECK-NEXT: bl
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;
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; With shrink-wrapping, epilogue is just after the call.
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; ENABLE-NEXT: add sp, #8
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; ENABLE-V5T-NEXT: pop {r7, pc}
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; ENABLE-V4T-NEXT: pop {r7}
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; ENABLE-V4T-NEXT: pop {r1}
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; ENABLE-V4T-NEXT: mov lr, r1
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;
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; CHECK: [[EXIT_LABEL]]:
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;
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; Without shrink-wrapping, epilogue is in the exit block.
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; Epilogue code. (What we pop does not matter.)
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; DISABLE: add sp, #8
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; DISABLE-V5T-NEXT: pop {r7, pc}
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; DISABLE-V4T-NEXT: pop {r7}
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; DISABLE-V4T-NEXT: pop {r1}
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; DISABLE-V4T-NEXT: bx r1
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;
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; ENABLE-NEXT: bx lr
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define i32 @foo(i32 %a, i32 %b) {
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%tmp = alloca i32, align 4
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%tmp2 = icmp slt i32 %a, %b
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br i1 %tmp2, label %true, label %false
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true:
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store i32 %a, i32* %tmp, align 4
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%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
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br label %false
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false:
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%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
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ret i32 %tmp.0
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}
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; Same, but the final BB is non-trivial, so we don't duplicate the return inst.
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; CHECK-LABEL: bar:
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;
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; With shrink-wrapping, epilogue is just after the call.
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; CHECK: bl
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; ENABLE-NEXT: add sp, #8
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; ENABLE-NEXT: pop {r7}
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; ENABLE-NEXT: pop {r0}
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; ENABLE-NEXT: mov lr, r0
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;
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; CHECK: movs r0, #42
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;
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; Without shrink-wrapping, epilogue is in the exit block.
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; Epilogue code. (What we pop does not matter.)
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; DISABLE: add sp, #8
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; DISABLE-V5T-NEXT: pop {r7, pc}
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; DISABLE-V4T-NEXT: pop {r7}
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; DISABLE-V4T-NEXT: pop {r1}
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; DISABLE-V4T-NEXT: bx r1
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;
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; ENABLE-NEXT: bx lr
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define i32 @bar(i32 %a, i32 %b) {
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%tmp = alloca i32, align 4
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%tmp2 = icmp slt i32 %a, %b
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br i1 %tmp2, label %true, label %false
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true:
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store i32 %a, i32* %tmp, align 4
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%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
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br label %false
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false:
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ret i32 42
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}
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; Function Attrs: optsize
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declare i32 @doSomething(i32, i32*)
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; Check that we do not perform the restore inside the loop whereas the save
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; is outside.
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; CHECK-LABEL: freqSaveAndRestoreOutsideLoop:
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;
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; Shrink-wrapping allows to skip the prologue in the else case.
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; ENABLE: cmp r0, #0
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; ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4, lr}
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;
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; DISABLE: cmp r0, #0
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; DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; SUM is in r0 because it is coalesced with the second
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; argument on the else path.
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; CHECK: movs [[SUM:r0]], #0
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; CHECK-NEXT: movs [[IV:r[0-9]+]], #10
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;
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; Next BB.
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; CHECK: [[LOOP:LBB[0-9_]+]]: @ %for.body
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; CHECK: movs [[TMP:r[0-9]+]], #1
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; CHECK: adds [[SUM]], [[TMP]], [[SUM]]
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; CHECK-NEXT: subs [[IV]], [[IV]], #1
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; CHECK-NEXT: cmp [[IV]], #0
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; CHECK-NEXT: bne [[LOOP]]
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;
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; Next BB.
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; SUM << 3.
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; CHECK: lsls [[SUM]], [[SUM]], #3
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;
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; Duplicated epilogue.
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; DISABLE-V5T: pop {r4, pc}
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; DISABLE-V4T: b [[END_LABEL:LBB[0-9_]+]]
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;
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; CHECK: [[ELSE_LABEL]]: @ %if.else
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; Shift second argument by one and store into returned register.
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; CHECK: lsls r0, r1, #1
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; DISABLE-V5T-NEXT: pop {r4, pc}
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; DISABLE-V4T-NEXT: [[END_LABEL]]: @ %if.end
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; DISABLE-V4T-NEXT: pop {r4}
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; DISABLE-V4T-NEXT: pop {r1}
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; DISABLE-V4T-NEXT: bx r1
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;
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; ENABLE-V5T-NEXT: {{LBB[0-9_]+}}: @ %if.end
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; ENABLE-NEXT: bx lr
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define i32 @freqSaveAndRestoreOutsideLoop(i32 %cond, i32 %N) {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %if.else, label %for.preheader
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for.preheader:
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tail call void asm "nop", ""()
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
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%sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
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%call = tail call i32 asm sideeffect "movs $0, #1", "=r,~{r4}"()
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%add = add nsw i32 %call, %sum.04
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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%shl = shl i32 %add, 3
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br label %if.end
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if.else: ; preds = %entry
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%mul = shl nsw i32 %N, 1
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br label %if.end
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if.end: ; preds = %if.else, %for.end
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%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
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ret i32 %sum.1
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}
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declare i32 @something(...)
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; Check that we do not perform the shrink-wrapping inside the loop even
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; though that would be legal. The cost model must prevent that.
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; CHECK-LABEL: freqSaveAndRestoreOutsideLoop2:
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4
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; This is the nop.
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; CHECK: mov r8, r8
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; CHECK: movs [[SUM:r0]], #0
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; CHECK-NEXT: movs [[IV:r[0-9]+]], #10
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; Next BB.
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; CHECK: [[LOOP_LABEL:LBB[0-9_]+]]: @ %for.body
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; CHECK: movs [[TMP:r[0-9]+]], #1
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; CHECK: adds [[SUM]], [[TMP]], [[SUM]]
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; CHECK-NEXT: subs [[IV]], [[IV]], #1
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; CHECK-NEXT: cmp [[IV]], #0
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; CHECK-NEXT: bne [[LOOP_LABEL]]
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; Next BB.
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; CHECK: @ %for.exit
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; This is the nop.
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; CHECK: mov r8, r8
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; CHECK: pop {r4
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define i32 @freqSaveAndRestoreOutsideLoop2(i32 %cond) {
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entry:
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br label %for.preheader
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for.preheader:
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tail call void asm "nop", ""()
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%i.04 = phi i32 [ 0, %for.preheader ], [ %inc, %for.body ]
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%sum.03 = phi i32 [ 0, %for.preheader ], [ %add, %for.body ]
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%call = tail call i32 asm sideeffect "movs $0, #1", "=r,~{r4}"()
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%add = add nsw i32 %call, %sum.03
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%inc = add nuw nsw i32 %i.04, 1
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %for.exit, label %for.body
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for.exit:
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tail call void asm "nop", ""()
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br label %for.end
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for.end: ; preds = %for.body
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ret i32 %add
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}
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; Check with a more complex case that we do not have save within the loop and
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; restore outside.
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; CHECK-LABEL: loopInfoSaveOutsideLoop:
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;
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; ENABLE: cmp r0, #0
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; ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4, lr}
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;
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; DISABLE: cmp r0, #0
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; DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; SUM is in r0 because it is coalesced with the second
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; argument on the else path.
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; CHECK: movs [[SUM:r0]], #0
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; CHECK-NEXT: movs [[IV:r[0-9]+]], #10
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;
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; Next BB.
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; CHECK: [[LOOP:LBB[0-9_]+]]: @ %for.body
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; CHECK: movs [[TMP:r[0-9]+]], #1
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; CHECK: adds [[SUM]], [[TMP]], [[SUM]]
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; CHECK-NEXT: subs [[IV]], [[IV]], #1
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; CHECK-NEXT: cmp [[IV]], #0
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; CHECK-NEXT: bne [[LOOP]]
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;
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; Next BB.
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; SUM << 3.
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; CHECK: lsls [[SUM]], [[SUM]], #3
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; ENABLE-V5T-NEXT: pop {r4, pc}
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; ENABLE-V4T-NEXT: pop {r4}
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; ENABLE-V4T-NEXT: pop {r1}
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; ENABLE-V4T-NEXT: bx r1
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;
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; Duplicated epilogue.
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; DISABLE-V5T: pop {r4, pc}
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; DISABLE-V4T: b [[END_LABEL:LBB[0-9_]+]]
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;
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; CHECK: [[ELSE_LABEL]]: @ %if.else
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; Shift second argument by one and store into returned register.
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; CHECK: lsls r0, r1, #1
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; DISABLE-V5T-NEXT: pop {r4, pc}
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; DISABLE-V4T-NEXT: [[END_LABEL]]: @ %if.end
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; DISABLE-V4T-NEXT: pop {r4}
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; DISABLE-V4T-NEXT: pop {r1}
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; DISABLE-V4T-NEXT: bx r1
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;
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; ENABLE-V5T-NEXT: {{LBB[0-9_]+}}: @ %if.end
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; ENABLE-NEXT: bx lr
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define i32 @loopInfoSaveOutsideLoop(i32 %cond, i32 %N) {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %if.else, label %for.preheader
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for.preheader:
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tail call void asm "nop", ""()
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br label %for.body
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for.body: ; preds = %entry, %for.body
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%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
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%sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
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%call = tail call i32 asm sideeffect "movs $0, #1", "=r,~{r4}"()
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%add = add nsw i32 %call, %sum.04
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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tail call void asm "nop", "~{r4}"()
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%shl = shl i32 %add, 3
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br label %if.end
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if.else: ; preds = %entry
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%mul = shl nsw i32 %N, 1
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br label %if.end
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if.end: ; preds = %if.else, %for.end
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%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
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ret i32 %sum.1
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}
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declare void @somethingElse(...)
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; Check with a more complex case that we do not have restore within the loop and
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; save outside.
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; CHECK-LABEL: loopInfoRestoreOutsideLoop:
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;
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; ENABLE: cmp r0, #0
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; ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; Make sure we save the CSR used in the inline asm: r4.
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; CHECK: push {r4, lr}
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;
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; DISABLE-NEXT: cmp r0, #0
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; DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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;
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; SUM is in r0 because it is coalesced with the second
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; argument on the else path.
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; CHECK: movs [[SUM:r0]], #0
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; CHECK-NEXT: movs [[IV:r[0-9]+]], #10
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;
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; Next BB.
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; CHECK: [[LOOP:LBB[0-9_]+]]: @ %for.body
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; CHECK: movs [[TMP:r[0-9]+]], #1
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; CHECK: adds [[SUM]], [[TMP]], [[SUM]]
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; CHECK-NEXT: subs [[IV]], [[IV]], #1
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; CHECK-NEXT: cmp [[IV]], #0
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; CHECK-NEXT: bne [[LOOP]]
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;
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; Next BB.
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; SUM << 3.
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; CHECK: lsls [[SUM]], [[SUM]], #3
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; ENABLE-V5T-NEXT: pop {r4, pc}
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; ENABLE-V4T-NEXT: pop {r4}
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; ENABLE-V4T-NEXT: pop {r1}
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; ENABLE-V4T-NEXT: bx r1
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;
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; Duplicated epilogue.
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; DISABLE-V5T: pop {r4, pc}
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; DISABLE-V4T: b [[END_LABEL:LBB[0-9_]+]]
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;
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; CHECK: [[ELSE_LABEL]]: @ %if.else
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; Shift second argument by one and store into returned register.
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; CHECK: lsls r0, r1, #1
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; DISABLE-V5T-NEXT: pop {r4, pc}
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; DISABLE-V4T-NEXT: [[END_LABEL]]: @ %if.end
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; DISABLE-V4T-NEXT: pop {r4}
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; DISABLE-V4T-NEXT: pop {r1}
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; DISABLE-V4T-NEXT: bx r1
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;
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; ENABLE-V5T-NEXT: {{LBB[0-9_]+}}: @ %if.end
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; ENABLE-NEXT: bx lr
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define i32 @loopInfoRestoreOutsideLoop(i32 %cond, i32 %N) #0 {
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entry:
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%tobool = icmp eq i32 %cond, 0
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br i1 %tobool, label %if.else, label %if.then
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if.then: ; preds = %entry
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tail call void asm "nop", "~{r4}"()
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br label %for.body
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for.body: ; preds = %for.body, %if.then
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%i.05 = phi i32 [ 0, %if.then ], [ %inc, %for.body ]
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%sum.04 = phi i32 [ 0, %if.then ], [ %add, %for.body ]
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%call = tail call i32 asm sideeffect "movs $0, #1", "=r,~{r4}"()
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%add = add nsw i32 %call, %sum.04
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%inc = add nuw nsw i32 %i.05, 1
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%exitcond = icmp eq i32 %inc, 10
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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%shl = shl i32 %add, 3
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br label %if.end
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if.else: ; preds = %entry
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%mul = shl nsw i32 %N, 1
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br label %if.end
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if.end: ; preds = %if.else, %for.end
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%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
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ret i32 %sum.1
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}
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; Check that we handle function with no frame information correctly.
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; CHECK-LABEL: emptyFrame:
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; CHECK: @ %entry
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; CHECK-NEXT: movs r0, #0
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; CHECK-NEXT: bx lr
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define i32 @emptyFrame() {
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entry:
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ret i32 0
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}
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; Check that we handle inline asm correctly.
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; CHECK-LABEL: inlineAsm:
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;
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; ENABLE: cmp r0, #0
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; ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
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|
;
|
|
; Prologue code.
|
|
; Make sure we save the CSR used in the inline asm: r4.
|
|
; CHECK: push {r4, lr}
|
|
;
|
|
; DISABLE: cmp r0, #0
|
|
; DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
|
|
;
|
|
; CHECK: movs [[IV:r[0-9]+]], #10
|
|
;
|
|
; Next BB.
|
|
; CHECK: [[LOOP:LBB[0-9_]+]]: @ %for.body
|
|
; CHECK: movs r4, #1
|
|
; CHECK: subs [[IV]], [[IV]], #1
|
|
; CHECK-NEXT: cmp [[IV]], #0
|
|
; CHECK-NEXT: bne [[LOOP]]
|
|
;
|
|
; Next BB.
|
|
; CHECK: movs r0, #0
|
|
; ENABLE-V5T-NEXT: pop {r4, pc}
|
|
; ENABLE-V4T-NEXT: pop {r4}
|
|
; ENABLE-V4T-NEXT: pop {r1}
|
|
; ENABLE-V4T-NEXT: bx r1
|
|
;
|
|
; Duplicated epilogue.
|
|
; DISABLE-V5T-NEXT: pop {r4, pc}
|
|
; DISABLE-V4T-NEXT: b [[END_LABEL:LBB[0-9_]+]]
|
|
;
|
|
; CHECK: [[ELSE_LABEL]]: @ %if.else
|
|
; Shift second argument by one and store into returned register.
|
|
; CHECK: lsls r0, r1, #1
|
|
; DISABLE-V5T-NEXT: pop {r4, pc}
|
|
; DISABLE-V4T-NEXT: [[END_LABEL]]: @ %if.end
|
|
; DISABLE-V4T-NEXT: pop {r4}
|
|
; DISABLE-V4T-NEXT: pop {r1}
|
|
; DISABLE-V4T-NEXT: bx r1
|
|
;
|
|
; ENABLE-V5T-NEXT: {{LBB[0-9_]+}}: @ %if.end
|
|
; ENABLE-NEXT: bx lr
|
|
define i32 @inlineAsm(i32 %cond, i32 %N) {
|
|
entry:
|
|
%tobool = icmp eq i32 %cond, 0
|
|
br i1 %tobool, label %if.else, label %for.preheader
|
|
|
|
for.preheader:
|
|
tail call void asm "nop", ""()
|
|
br label %for.body
|
|
|
|
for.body: ; preds = %entry, %for.body
|
|
%i.03 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
|
|
tail call void asm sideeffect "movs r4, #1", "~{r4}"()
|
|
%inc = add nuw nsw i32 %i.03, 1
|
|
%exitcond = icmp eq i32 %inc, 10
|
|
br i1 %exitcond, label %for.exit, label %for.body
|
|
|
|
for.exit:
|
|
tail call void asm "nop", ""()
|
|
br label %if.end
|
|
|
|
if.else: ; preds = %entry
|
|
%mul = shl nsw i32 %N, 1
|
|
br label %if.end
|
|
|
|
if.end: ; preds = %for.body, %if.else
|
|
%sum.0 = phi i32 [ %mul, %if.else ], [ 0, %for.exit ]
|
|
ret i32 %sum.0
|
|
}
|
|
|
|
; Check that we handle calls to variadic functions correctly.
|
|
; CHECK-LABEL: callVariadicFunc:
|
|
;
|
|
; ENABLE: cmp r0, #0
|
|
; ENABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
|
|
;
|
|
; Prologue code.
|
|
; CHECK: push {[[TMP:r[0-9]+]], lr}
|
|
; CHECK: sub sp, #16
|
|
;
|
|
; DISABLE: cmp r0, #0
|
|
; DISABLE-NEXT: beq [[ELSE_LABEL:LBB[0-9_]+]]
|
|
;
|
|
; Setup of the varags.
|
|
; CHECK: mov [[TMP_SP:r[0-9]+]], sp
|
|
; CHECK-NEXT: str r1, {{\[}}[[TMP_SP]]]
|
|
; CHECK-NEXT: str r1, {{\[}}[[TMP_SP]], #4]
|
|
; CHECK-NEXT: str r1, {{\[}}[[TMP_SP]], #8]
|
|
; Thumb has quite a strange way for moving stuff
|
|
; in around. Oh well, match the current sequence.
|
|
; CHECK: push {r1}
|
|
; CHECK-NEXT: pop {r0}
|
|
; CHECK: push {r1}
|
|
; CHECK-NEXT: pop {r2}
|
|
; CHECK: push {r1}
|
|
; CHECK-NEXT: pop {r3}
|
|
; CHECK-NEXT: bl
|
|
; CHECK-NEXT: lsls r0, r0, #3
|
|
;
|
|
; ENABLE-NEXT: add sp, #16
|
|
; ENABLE-V5T-NEXT: pop {[[TMP]], pc}
|
|
; ENABLE-V4T-NEXT: pop {[[TMP]]}
|
|
; ENABLE-V4T-NEXT: pop {r1}
|
|
; ENABLE-V4T-NEXT: bx r1
|
|
;
|
|
; Duplicated epilogue.
|
|
; DISABLE-V5T-NEXT: add sp, #16
|
|
; DISABLE-V5T-NEXT: pop {[[TMP]], pc}
|
|
; DISABLE-V4T-NEXT: b [[END_LABEL:LBB[0-9_]+]]
|
|
;
|
|
; CHECK: [[ELSE_LABEL]]: @ %if.else
|
|
; Shift second argument by one and store into returned register.
|
|
; CHECK: lsls r0, r1, #1
|
|
;
|
|
; Epilogue code.
|
|
; ENABLE-V5T-NEXT: {{LBB[0-9_]+}}: @ %if.end
|
|
; ENABLE-NEXT: bx lr
|
|
;
|
|
; DISABLE-V4T-NEXT: [[END_LABEL]]: @ %if.end
|
|
; DISABLE-NEXT: add sp, #16
|
|
; DISABLE-V5T-NEXT: pop {[[TMP]], pc}
|
|
; DISABLE-V4T-NEXT: pop {[[TMP]]}
|
|
; DISABLE-V4T-NEXT: pop {r1}
|
|
; DISABLE-V4T-NEXT: bx r1
|
|
define i32 @callVariadicFunc(i32 %cond, i32 %N) {
|
|
entry:
|
|
%tobool = icmp eq i32 %cond, 0
|
|
br i1 %tobool, label %if.else, label %if.then
|
|
|
|
if.then: ; preds = %entry
|
|
%call = tail call i32 (i32, ...) @someVariadicFunc(i32 %N, i32 %N, i32 %N, i32 %N, i32 %N, i32 %N, i32 %N)
|
|
%shl = shl i32 %call, 3
|
|
br label %if.end
|
|
|
|
if.else: ; preds = %entry
|
|
%mul = shl nsw i32 %N, 1
|
|
br label %if.end
|
|
|
|
if.end: ; preds = %if.else, %if.then
|
|
%sum.0 = phi i32 [ %shl, %if.then ], [ %mul, %if.else ]
|
|
ret i32 %sum.0
|
|
}
|
|
|
|
declare i32 @someVariadicFunc(i32, ...)
|
|
|
|
; Make sure we do not insert unreachable code after noreturn function.
|
|
; Although this is not incorrect to insert such code, it is useless
|
|
; and it hurts the binary size.
|
|
;
|
|
; CHECK-LABEL: noreturn:
|
|
; DISABLE: push
|
|
;
|
|
; CHECK: movs [[TMP:r[0-9]+]], #255
|
|
; CHECK-NEXT: tst r0, [[TMP]]
|
|
; CHECK-NEXT: bne [[ABORT:LBB[0-9_]+]]
|
|
;
|
|
; CHECK: movs r0, #42
|
|
;
|
|
; ENABLE-NEXT: bx lr
|
|
;
|
|
; DISABLE-NEXT: pop
|
|
;;
|
|
; CHECK: [[ABORT]]: @ %if.abort
|
|
;
|
|
; ENABLE: push
|
|
;
|
|
; CHECK: bl
|
|
; ENABLE-NOT: pop
|
|
define i32 @noreturn(i8 signext %bad_thing) {
|
|
entry:
|
|
%tobool = icmp eq i8 %bad_thing, 0
|
|
br i1 %tobool, label %if.end, label %if.abort
|
|
|
|
if.abort:
|
|
%call = tail call i32 asm sideeffect "movs $0, #1", "=r,~{r4}"()
|
|
tail call void @abort() #0
|
|
unreachable
|
|
|
|
if.end:
|
|
ret i32 42
|
|
}
|
|
|
|
declare void @abort() #0
|
|
|
|
define i32 @b_to_bx(i32 %value) {
|
|
; CHECK-LABEL: b_to_bx:
|
|
; DISABLE: push {r7, lr}
|
|
; CHECK: cmp r1, #49
|
|
; CHECK-NEXT: bgt [[ELSE_LABEL:LBB[0-9_]+]]
|
|
; ENABLE: push {r7, lr}
|
|
|
|
; CHECK: bl
|
|
; DISABLE-V5-NEXT: pop {r7, pc}
|
|
; DISABLE-V4T-NEXT: b [[END_LABEL:LBB[0-9_]+]]
|
|
|
|
; ENABLE-V5-NEXT: pop {r7, pc}
|
|
; ENABLE-V4-NEXT: pop {r7}
|
|
; ENABLE-V4-NEXT: pop {r1}
|
|
; ENABLE-V4-NEXT: bx r1
|
|
|
|
; CHECK: [[ELSE_LABEL]]: @ %if.else
|
|
; CHECK-NEXT: lsls r0, r1, #1
|
|
; DISABLE-V5-NEXT: pop {r7, pc}
|
|
; DISABLE-V4T-NEXT: [[END_LABEL]]: @ %if.end
|
|
; DISABLE-V4T-NEXT: pop {r7}
|
|
; DISABLE-V4T-NEXT: pop {r1}
|
|
; DISABLE-V4T-NEXT: bx r1
|
|
|
|
; ENABLE-V5T-NEXT: {{LBB[0-9_]+}}: @ %if.end
|
|
; ENABLE-NEXT: bx lr
|
|
|
|
entry:
|
|
%cmp = icmp slt i32 %value, 50
|
|
br i1 %cmp, label %if.then, label %if.else
|
|
|
|
if.then:
|
|
%div = sdiv i32 5000, %value
|
|
br label %if.end
|
|
|
|
if.else:
|
|
%mul = shl nsw i32 %value, 1
|
|
br label %if.end
|
|
|
|
if.end:
|
|
%value.addr.0 = phi i32 [ %div, %if.then ], [ %mul, %if.else ]
|
|
ret i32 %value.addr.0
|
|
}
|
|
|
|
define i1 @beq_to_bx(i32* %y, i32 %head) {
|
|
; CHECK-LABEL: beq_to_bx:
|
|
; DISABLE: push {r4, lr}
|
|
; CHECK: cmp r2, #0
|
|
; CHECK-NEXT: beq [[EXIT_LABEL:LBB[0-9_]+]]
|
|
; ENABLE: push {r4, lr}
|
|
|
|
; CHECK: tst r3, r4
|
|
; ENABLE-NEXT: pop {r4}
|
|
; ENABLE-NEXT: pop {r3}
|
|
; ENABLE-NEXT: mov lr, r3
|
|
; CHECK-NEXT: beq [[EXIT_LABEL]]
|
|
|
|
; CHECK: str r1, [r2]
|
|
; CHECK-NEXT: movs r0, #0
|
|
; CHECK-NEXT: [[EXIT_LABEL]]: @ %cleanup
|
|
; ENABLE-NEXT: bx lr
|
|
; DISABLE-V5-NEXT: pop {r4, pc}
|
|
; DISABLE-V4T-NEXT: pop {r4}
|
|
; DISABLE-V4T-NEXT: pop {r1}
|
|
; DISABLE-V4T-NEXT: bx r1
|
|
|
|
entry:
|
|
%cmp = icmp eq i32* %y, null
|
|
br i1 %cmp, label %cleanup, label %if.end
|
|
|
|
if.end:
|
|
%z = load i32, i32* %y, align 4
|
|
%and = and i32 %z, 2
|
|
%cmp2 = icmp eq i32 %and, 0
|
|
br i1 %cmp2, label %cleanup, label %if.end4
|
|
|
|
if.end4:
|
|
store i32 %head, i32* %y, align 4
|
|
br label %cleanup
|
|
|
|
cleanup:
|
|
%retval.0 = phi i1 [ 0, %if.end4 ], [ 1, %entry ], [ 1, %if.end ]
|
|
ret i1 %retval.0
|
|
}
|
|
|
|
attributes #0 = { noreturn nounwind }
|