You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
100 lines
2.7 KiB
100 lines
2.7 KiB
; RUN: opt -S -early-cse < %s | FileCheck %s
|
|
|
|
declare void @clobber_and_use(i32)
|
|
|
|
define void @f_0(i32* %ptr) {
|
|
; CHECK-LABEL: @f_0(
|
|
; CHECK: %val0 = load i32, i32* %ptr, !invariant.load !0
|
|
; CHECK: call void @clobber_and_use(i32 %val0)
|
|
; CHECK: call void @clobber_and_use(i32 %val0)
|
|
; CHECK: call void @clobber_and_use(i32 %val0)
|
|
; CHECK: ret void
|
|
|
|
%val0 = load i32, i32* %ptr, !invariant.load !{}
|
|
call void @clobber_and_use(i32 %val0)
|
|
%val1 = load i32, i32* %ptr, !invariant.load !{}
|
|
call void @clobber_and_use(i32 %val1)
|
|
%val2 = load i32, i32* %ptr, !invariant.load !{}
|
|
call void @clobber_and_use(i32 %val2)
|
|
ret void
|
|
}
|
|
|
|
define void @f_1(i32* %ptr) {
|
|
; We can forward invariant loads to non-invariant loads, since once an
|
|
; invariant load has executed, the location loaded from is known to be
|
|
; unchanging.
|
|
|
|
; CHECK-LABEL: @f_1(
|
|
; CHECK: %val0 = load i32, i32* %ptr, !invariant.load !0
|
|
; CHECK: call void @clobber_and_use(i32 %val0)
|
|
; CHECK: call void @clobber_and_use(i32 %val0)
|
|
|
|
%val0 = load i32, i32* %ptr, !invariant.load !{}
|
|
call void @clobber_and_use(i32 %val0)
|
|
%val1 = load i32, i32* %ptr
|
|
call void @clobber_and_use(i32 %val1)
|
|
ret void
|
|
}
|
|
|
|
define void @f_2(i32* %ptr) {
|
|
; Negative test -- we can't forward a non-invariant load into an
|
|
; invariant load.
|
|
|
|
; CHECK-LABEL: @f_2(
|
|
; CHECK: %val0 = load i32, i32* %ptr
|
|
; CHECK: call void @clobber_and_use(i32 %val0)
|
|
; CHECK: %val1 = load i32, i32* %ptr, !invariant.load !0
|
|
; CHECK: call void @clobber_and_use(i32 %val1)
|
|
|
|
%val0 = load i32, i32* %ptr
|
|
call void @clobber_and_use(i32 %val0)
|
|
%val1 = load i32, i32* %ptr, !invariant.load !{}
|
|
call void @clobber_and_use(i32 %val1)
|
|
ret void
|
|
}
|
|
|
|
define void @f_3(i1 %cond, i32* %ptr) {
|
|
; CHECK-LABEL: @f_3(
|
|
%val0 = load i32, i32* %ptr, !invariant.load !{}
|
|
call void @clobber_and_use(i32 %val0)
|
|
br i1 %cond, label %left, label %right
|
|
|
|
; CHECK: %val0 = load i32, i32* %ptr, !invariant.load !0
|
|
; CHECK: left:
|
|
; CHECK-NEXT: call void @clobber_and_use(i32 %val0)
|
|
|
|
left:
|
|
%val1 = load i32, i32* %ptr
|
|
call void @clobber_and_use(i32 %val1)
|
|
ret void
|
|
|
|
right:
|
|
ret void
|
|
}
|
|
|
|
define void @f_4(i1 %cond, i32* %ptr) {
|
|
; Negative test -- can't forward %val0 to %va1 because that'll break
|
|
; def-dominates-use.
|
|
|
|
; CHECK-LABEL: @f_4(
|
|
br i1 %cond, label %left, label %merge
|
|
|
|
left:
|
|
; CHECK: left:
|
|
; CHECK-NEXT: %val0 = load i32, i32* %ptr, !invariant.load !
|
|
; CHECK-NEXT: call void @clobber_and_use(i32 %val0)
|
|
|
|
%val0 = load i32, i32* %ptr, !invariant.load !{}
|
|
call void @clobber_and_use(i32 %val0)
|
|
br label %merge
|
|
|
|
merge:
|
|
; CHECK: merge:
|
|
; CHECK-NEXT: %val1 = load i32, i32* %ptr
|
|
; CHECK-NEXT: call void @clobber_and_use(i32 %val1)
|
|
|
|
%val1 = load i32, i32* %ptr
|
|
call void @clobber_and_use(i32 %val1)
|
|
ret void
|
|
}
|