35 lines
1.2 KiB
LLVM
35 lines
1.2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt < %s -passes=reassociate -S | FileCheck %s
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; We cannot preserve nuw flags for mul
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define i4 @nuw_preserve_negative(i4 %a, i4 %b, i4 %c) {
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; CHECK-LABEL: define i4 @nuw_preserve_negative(
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; CHECK-SAME: i4 [[A:%.*]], i4 [[B:%.*]], i4 [[C:%.*]]) {
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; CHECK-NEXT: [[V0:%.*]] = mul i4 [[B]], [[A]]
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; CHECK-NEXT: [[V1:%.*]] = mul i4 [[V0]], [[C]]
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; CHECK-NEXT: ret i4 [[V1]]
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;
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%v0 = mul nuw i4 %a, %c
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%v1 = mul nuw i4 %v0, %b
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ret i4 %v1
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}
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; TODO: we can add nuw flags if we know all operands are non-zero.
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define i4 @nuw_preserve_non_zero(i4 %a, i4 %b, i4 %c) {
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; CHECK-LABEL: define i4 @nuw_preserve_non_zero(
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; CHECK-SAME: i4 [[A:%.*]], i4 [[B:%.*]], i4 [[C:%.*]]) {
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; CHECK-NEXT: [[A0:%.*]] = add nuw i4 [[A]], 1
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; CHECK-NEXT: [[B0:%.*]] = add nuw i4 [[B]], 1
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; CHECK-NEXT: [[C0:%.*]] = add nuw i4 [[C]], 1
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; CHECK-NEXT: [[V0:%.*]] = mul i4 [[B0]], [[A0]]
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; CHECK-NEXT: [[V1:%.*]] = mul i4 [[V0]], [[C0]]
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; CHECK-NEXT: ret i4 [[V1]]
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;
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%a0 = add nuw i4 %a, 1
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%b0 = add nuw i4 %b, 1
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%c0 = add nuw i4 %c, 1
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%v0 = mul nuw i4 %a0, %c0
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%v1 = mul nuw i4 %v0, %b0
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ret i4 %v1
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}
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