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da8ee8e7dc
This combiner breaks debug experience and should not be run when optimizations are disabled.
For example:
int main() {
int j = 0;
j += 2;
if (j == 2)
return 0;
return 5;
}
When debugging this code compiled in /O0, it should be valid to break at line "j+=2;" and edit the value of j. It should change the return value of the function.
Differential Revision: https://reviews.llvm.org/D19268
llvm-svn: 284014
42 lines
1.4 KiB
LLVM
42 lines
1.4 KiB
LLVM
; RUN: llc < %s -mtriple=arm-eabi -mattr=+v4t -O0 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK_O0
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; RUN: llc < %s -mtriple=arm-eabi -mattr=+v4t -O1 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK_O1
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; In /O0, the addition must not be eliminated. This happens when the load
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; and store are folded by the DAGCombiner. In /O1 and above, the optimization
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; must be executed.
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; CHECK-LABEL: {{^}}main
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; CHECK: mov [[TMP:r[0-9]+]], #0
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; CHECK-NEXT: str [[TMP]], [sp, #4]
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; CHECK-NEXT: str [[TMP]], [sp]
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; CHECK_O0: ldr [[TMP:r[0-9]+]], [sp]
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; CHECK_O0-NEXT: add [[TMP]], [[TMP]], #2
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; CHECK_O1-NOT: ldr [[TMP:r[0-9]+]], [sp]
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; CHECK_O1-NOT: add [[TMP]], [[TMP]], #2
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define i32 @main() {
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bb:
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%tmp = alloca i32, align 4
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%tmp1 = alloca i32, align 4
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store i32 0, i32* %tmp, align 4
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store i32 0, i32* %tmp1, align 4
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%tmp2 = load i32, i32* %tmp1, align 4
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%tmp3 = add nsw i32 %tmp2, 2
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store i32 %tmp3, i32* %tmp1, align 4
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%tmp4 = load i32, i32* %tmp1, align 4
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%tmp5 = icmp eq i32 %tmp4, 2
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br i1 %tmp5, label %bb6, label %bb7
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bb6: ; preds = %bb
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store i32 0, i32* %tmp, align 4
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br label %bb8
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bb7: ; preds = %bb
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store i32 5, i32* %tmp, align 4
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br label %bb8
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bb8: ; preds = %bb7, %bb6
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%tmp9 = load i32, i32* %tmp, align 4
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ret i32 %tmp9
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}
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