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Diffstat (limited to 'test/Transforms/InstCombine/pr20059.ll')
| -rw-r--r-- | test/Transforms/InstCombine/pr20059.ll | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/pr20059.ll b/test/Transforms/InstCombine/pr20059.ll new file mode 100644 index 0000000..0ef3159 --- /dev/null +++ b/test/Transforms/InstCombine/pr20059.ll @@ -0,0 +1,16 @@ +; RUN: opt -S -instcombine < %s | FileCheck %s + +; In PR20059 ( http://llvm.org/pr20059 ), shufflevector operations are reordered/removed +; for an srem operation. This is not a valid optimization because it may cause a trap +; on div-by-zero. + +; CHECK-LABEL: @do_not_reorder +; CHECK: %splat1 = shufflevector <4 x i32> %p1, <4 x i32> undef, <4 x i32> zeroinitializer +; CHECK-NEXT: %splat2 = shufflevector <4 x i32> %p2, <4 x i32> undef, <4 x i32> zeroinitializer +; CHECK-NEXT: %retval = srem <4 x i32> %splat1, %splat2 +define <4 x i32> @do_not_reorder(<4 x i32> %p1, <4 x i32> %p2) { + %splat1 = shufflevector <4 x i32> %p1, <4 x i32> undef, <4 x i32> zeroinitializer + %splat2 = shufflevector <4 x i32> %p2, <4 x i32> undef, <4 x i32> zeroinitializer + %retval = srem <4 x i32> %splat1, %splat2 + ret <4 x i32> %retval +} |