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Diffstat (limited to 'test/Transforms/Reassociate/wrap-flags.ll')
| -rw-r--r-- | test/Transforms/Reassociate/wrap-flags.ll | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/test/Transforms/Reassociate/wrap-flags.ll b/test/Transforms/Reassociate/wrap-flags.ll new file mode 100644 index 0000000..e3304b6 --- /dev/null +++ b/test/Transforms/Reassociate/wrap-flags.ll @@ -0,0 +1,34 @@ +; RUN: opt < %s -reassociate -dce -S | FileCheck %s +; PR12985 + +; Verify the nsw flags are preserved when converting shl to mul. + +; CHECK-LABEL: @shl_to_mul_nsw( +; CHECK: %mul = mul i32 %i, -2147483648 +; CHECK: add i32 %mul, 1 +define i32 @shl_to_mul_nsw(i32 %i) { +entry: + %mul = shl nsw i32 %i, 31 + %mul2 = add i32 %mul, 1 + ret i32 %mul2 +} + +; CHECK-LABEL: @shl_to_mul_nuw( +; CHECK: %mul = mul nuw i32 %i, 4 +; CHECK: add i32 %mul, 1 +define i32 @shl_to_mul_nuw(i32 %i) { +entry: + %mul = shl nuw i32 %i, 2 + %mul2 = add i32 %mul, 1 + ret i32 %mul2 +} + +; CHECK-LABEL: @shl_to_mul_nuw_nsw( +; CHECK: %mul = mul nuw nsw i32 %i, 4 +; CHECK: add i32 %mul, 1 +define i32 @shl_to_mul_nuw_nsw(i32 %i) { +entry: + %mul = shl nuw nsw i32 %i, 2 + %mul2 = add i32 %mul, 1 + ret i32 %mul2 +} |