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| author | Chen Zheng <shchenz@cn.ibm.com> | 2018-07-12 03:06:04 +0000 |
|---|---|---|
| committer | Chen Zheng <shchenz@cn.ibm.com> | 2018-07-12 03:06:04 +0000 |
| commit | fdf13ef342e29d22f96f64a82679609873229d92 (patch) | |
| tree | 1f97d7a6e459eb0081f2faf9ea1d5ca32c82d891 /llvm/test | |
| parent | 71f1ec7ea1108937251d3681fb91d882009f0a97 (diff) | |
| download | bcm5719-llvm-fdf13ef342e29d22f96f64a82679609873229d92.tar.gz bcm5719-llvm-fdf13ef342e29d22f96f64a82679609873229d92.zip | |
[InstSimplify] simplify add instruction if two operands are negative
Differential Revision: https://reviews.llvm.org/D49216
llvm-svn: 336881
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/Transforms/InstSimplify/add.ll | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/llvm/test/Transforms/InstSimplify/add.ll b/llvm/test/Transforms/InstSimplify/add.ll index d32b2551ab1..21cc905688b 100644 --- a/llvm/test/Transforms/InstSimplify/add.ll +++ b/llvm/test/Transforms/InstSimplify/add.ll @@ -30,10 +30,7 @@ define <2 x i32> @negated_operand_commute_vec(<2 x i32> %x) { define i8 @knownnegation(i8 %x, i8 %y) { ; CHECK-LABEL: @knownnegation( -; CHECK-NEXT: [[XY:%.*]] = sub i8 [[X:%.*]], [[Y:%.*]] -; CHECK-NEXT: [[YX:%.*]] = sub i8 [[Y]], [[X]] -; CHECK-NEXT: [[R:%.*]] = add i8 [[XY]], [[YX]] -; CHECK-NEXT: ret i8 [[R]] +; CHECK-NEXT: ret i8 0 ; %xy = sub i8 %x, %y %yx = sub i8 %y, %x @@ -43,10 +40,7 @@ define i8 @knownnegation(i8 %x, i8 %y) { define <2 x i8> @knownnegation_commute_vec(<2 x i8> %x, <2 x i8> %y) { ; CHECK-LABEL: @knownnegation_commute_vec( -; CHECK-NEXT: [[XY:%.*]] = sub <2 x i8> [[X:%.*]], [[Y:%.*]] -; CHECK-NEXT: [[YX:%.*]] = sub <2 x i8> [[Y]], [[X]] -; CHECK-NEXT: [[R:%.*]] = add <2 x i8> [[YX]], [[XY]] -; CHECK-NEXT: ret <2 x i8> [[R]] +; CHECK-NEXT: ret <2 x i8> zeroinitializer ; %xy = sub <2 x i8> %x, %y %yx = sub <2 x i8> %y, %x |
