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a0e08bf0d4
then it doesn't alter the instructions composing it, however it would continue to move the instructions to just before the expression root. Ensure it doesn't move them either, so now it really does nothing if there is nothing to do. That commit also ensured that nsw etc flags weren't cleared if the expression was not being changed. Tweak this a bit so that it doesn't clear flags on the initial part of a computation either if that part didn't change but later bits did. llvm-svn: 157518
39 lines
1.1 KiB
LLVM
39 lines
1.1 KiB
LLVM
; RUN: opt < %s -reassociate -S | FileCheck %s
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; When there is nothing to do, or not much to do, check that reassociate leaves
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; things alone.
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declare void @use(i32)
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define void @test1(i32 %a, i32 %b) {
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; Shouldn't change or move any of the add instructions. Should commute but
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; otherwise not change or move any of the mul instructions.
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; CHECK: @test1
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%a0 = add nsw i32 %a, 1
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; CHECK-NEXT: %a0 = add nsw i32 %a, 1
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%m0 = mul nsw i32 3, %a
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; CHECK-NEXT: %m0 = mul nsw i32 %a, 3
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%a1 = add nsw i32 %a0, %b
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; CHECK-NEXT: %a1 = add nsw i32 %a0, %b
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%m1 = mul nsw i32 %b, %m0
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; CHECK-NEXT: %m1 = mul nsw i32 %m0, %b
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call void @use(i32 %a1)
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; CHECK-NEXT: call void @use
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call void @use(i32 %m1)
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ret void
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}
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define void @test2(i32 %a, i32 %b, i32 %c, i32 %d) {
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; The initial add doesn't change so should not lose the nsw flag.
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; CHECK: @test2
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%a0 = add nsw i32 %b, %a
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; CHECK-NEXT: %a0 = add nsw i32 %b, %a
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%a1 = add nsw i32 %a0, %d
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; CHECK-NEXT: %a1 = add i32 %a0, %c
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%a2 = add nsw i32 %a1, %c
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; CHECK-NEXT: %a2 = add i32 %a1, %d
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call void @use(i32 %a2)
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; CHECK-NEXT: call void @use
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ret void
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}
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