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154 lines
6.6 KiB
154 lines
6.6 KiB
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -mtriple=thumbv8.1m.main -run-pass=arm-low-overhead-loops -verify-machineinstrs %s -o - | FileCheck %s
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# Check that subs isn't used during the revert because there's a def after LoopDec.
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--- |
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define i32 @do_copy(i32 %n, i32* nocapture %p, i32* nocapture readonly %q) {
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entry:
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%scevgep = getelementptr i32, i32* %q, i32 -1
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%scevgep3 = getelementptr i32, i32* %p, i32 -1
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%start = call i32 @llvm.start.loop.iterations.i32(i32 %n)
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%limit = lshr i32 %n, 1
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br label %while.body
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while.body: ; preds = %while.body, %entry
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%lsr.iv4 = phi i32* [ %scevgep5, %while.body ], [ %scevgep3, %entry ]
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%lsr.iv = phi i32* [ %scevgep1, %while.body ], [ %scevgep, %entry ]
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%tmp = phi i32 [ %start, %entry ], [ %tmp2, %while.body ]
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%scevgep7 = getelementptr i32, i32* %lsr.iv, i32 1
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%scevgep4 = getelementptr i32, i32* %lsr.iv4, i32 1
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%tmp1 = load i32, i32* %scevgep7, align 4
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%tmp2 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %tmp, i32 1)
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%half = lshr i32 %tmp1, 1
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%cmp = icmp ult i32 %tmp, %limit
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%res = select i1 %cmp, i32 %tmp1, i32 %half
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store i32 %res, i32* %scevgep4, align 4
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%scevgep1 = getelementptr i32, i32* %lsr.iv, i32 1
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%scevgep5 = getelementptr i32, i32* %lsr.iv4, i32 1
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%tmp3 = icmp ne i32 %tmp2, 0
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br i1 %tmp3, label %while.body, label %while.end
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while.end: ; preds = %while.body
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ret i32 0
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}
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; Function Attrs: noduplicate nounwind
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declare i32 @llvm.start.loop.iterations.i32(i32) #0
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; Function Attrs: noduplicate nounwind
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declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #0
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; Function Attrs: nounwind
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declare void @llvm.stackprotector(i8*, i8**) #1
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attributes #0 = { noduplicate nounwind }
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attributes #1 = { nounwind }
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...
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---
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name: do_copy
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alignment: 2
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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registers: []
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liveins:
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- { reg: '$r0', virtual-reg: '' }
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- { reg: '$r1', virtual-reg: '' }
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- { reg: '$r2', virtual-reg: '' }
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 8
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offsetAdjustment: 0
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maxAlignment: 4
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adjustsStack: false
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hasCalls: false
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stackProtector: ''
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maxCallFrameSize: 0
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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localFrameSize: 0
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savePoint: ''
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restorePoint: ''
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fixedStack: []
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stack:
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- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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callSites: []
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constants: []
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machineFunctionInfo: {}
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body: |
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; CHECK-LABEL: name: do_copy
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; CHECK: bb.0.entry:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: liveins: $r0, $r1, $r2, $r7, $lr
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; CHECK: frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
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; CHECK: frame-setup CFI_INSTRUCTION def_cfa_offset 8
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; CHECK: frame-setup CFI_INSTRUCTION offset $lr, -4
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; CHECK: frame-setup CFI_INSTRUCTION offset $r7, -8
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; CHECK: $lr = tMOVr killed $r0, 14 /* CC::al */, $noreg
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; CHECK: renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 4, 14 /* CC::al */, $noreg
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; CHECK: renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14 /* CC::al */, $noreg
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; CHECK: renamable $r2 = t2LSRri renamable $lr, 1, 14 /* CC::al */, $noreg, $noreg
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; CHECK: bb.1.while.body:
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; CHECK: successors: %bb.1(0x7c000000), %bb.2(0x04000000)
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; CHECK: liveins: $lr, $r0, $r1, $r2
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; CHECK: renamable $r3, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14 /* CC::al */, $noreg :: (load 4 from %ir.scevgep7)
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; CHECK: tCMPhir renamable $lr, renamable $r2, 14 /* CC::al */, $noreg, implicit-def $cpsr
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; CHECK: $lr = t2SUBri killed renamable $lr, 1, 14 /* CC::al */, $noreg, $noreg
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; CHECK: t2IT 2, 8, implicit-def $itstate
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; CHECK: renamable $r3 = tLSRri $noreg, killed renamable $r3, 1, 2 /* CC::hs */, killed $cpsr, implicit renamable $r3, implicit killed $itstate
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; CHECK: early-clobber renamable $r0 = t2STR_PRE killed renamable $r3, killed renamable $r0, 4, 14 /* CC::al */, $noreg :: (store 4 into %ir.scevgep4)
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; CHECK: t2CMPri renamable $lr, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
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; CHECK: tBcc %bb.1, 4 /* CC::mi */, killed $cpsr
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; CHECK: tB %bb.2, 14 /* CC::al */, $noreg
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; CHECK: bb.2.while.end:
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; CHECK: $r0, dead $cpsr = tMOVi8 0, 14 /* CC::al */, $noreg
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; CHECK: tPOP_RET 14 /* CC::al */, $noreg, def $r7, def $pc, implicit killed $r0
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bb.0.entry:
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successors: %bb.1(0x80000000)
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liveins: $r0, $r1, $r2, $r7, $lr
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frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
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frame-setup CFI_INSTRUCTION def_cfa_offset 8
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frame-setup CFI_INSTRUCTION offset $lr, -4
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frame-setup CFI_INSTRUCTION offset $r7, -8
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$lr = tMOVr killed $r0, 14, $noreg
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renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 4, 14, $noreg
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renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14, $noreg
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renamable $r2 = t2LSRri renamable $lr, 1, 14, $noreg, $noreg
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$lr = t2DoLoopStart renamable $lr
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bb.1.while.body:
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successors: %bb.1(0x7c000000), %bb.2(0x04000000)
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liveins: $lr, $r0, $r1, $r2
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renamable $r3, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14, $noreg :: (load 4 from %ir.scevgep7)
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tCMPhir renamable $lr, renamable $r2, 14, $noreg, implicit-def $cpsr
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renamable $lr = t2LoopDec killed renamable $lr, 1
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t2IT 2, 8, implicit-def $itstate
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renamable $r3 = tLSRri $noreg, killed renamable $r3, 1, 2, killed $cpsr, implicit renamable $r3, implicit killed $itstate
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early-clobber renamable $r0 = t2STR_PRE killed renamable $r3, killed renamable $r0, 4, 14, $noreg :: (store 4 into %ir.scevgep4)
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t2CMPri renamable $lr, 0, 14, $noreg, implicit-def $cpsr
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tBcc %bb.1, 4, killed $cpsr
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tB %bb.2, 14, $noreg
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bb.2.while.end:
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$r0, dead $cpsr = tMOVi8 0, 14, $noreg
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tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0
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...
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