derek.holloway
7502bf64a4
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45 lines
1.4 KiB
LLVM
45 lines
1.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=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-LABEL: @test1(
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; CHECK-NEXT: [[A0:%.*]] = add nsw i32 [[A:%.*]], 1
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; CHECK-NEXT: [[M0:%.*]] = mul nsw i32 [[A]], 3
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; CHECK-NEXT: [[A1:%.*]] = add nsw i32 [[A0]], [[B:%.*]]
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; CHECK-NEXT: [[M1:%.*]] = mul nsw i32 [[M0]], [[B]]
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; CHECK-NEXT: call void @use(i32 [[A1]])
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; CHECK-NEXT: call void @use(i32 [[M1]])
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; CHECK-NEXT: ret void
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;
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%a0 = add nsw i32 %a, 1
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%m0 = mul nsw i32 3, %a
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%a1 = add nsw i32 %a0, %b
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%m1 = mul nsw i32 %b, %m0
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call void @use(i32 %a1)
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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-LABEL: @test2(
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; CHECK-NEXT: [[A0:%.*]] = add nsw i32 [[B:%.*]], [[A:%.*]]
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; CHECK-NEXT: [[A1:%.*]] = add i32 [[A0]], [[C:%.*]]
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; CHECK-NEXT: [[A2:%.*]] = add i32 [[A1]], [[D:%.*]]
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; CHECK-NEXT: call void @use(i32 [[A2]])
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; CHECK-NEXT: ret void
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;
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%a0 = add nsw i32 %b, %a
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%a1 = add nsw i32 %a0, %d
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%a2 = add nsw i32 %a1, %c
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call void @use(i32 %a2)
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ret void
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}
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