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| author | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-05-05 01:54:42 +0000 |
|---|---|---|
| committer | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-05-05 01:54:42 +0000 |
| commit | a670a0a3aafba2ce41faffe070880807d69940d8 (patch) | |
| tree | 91af1839d664d2967c124075e7b97c66455c22e7 /llvm/test/Transforms/LoopVectorize | |
| parent | 010316ce34b857d415c9f30a79ef7d27f7beb866 (diff) | |
| download | bcm5719-llvm-a670a0a3aafba2ce41faffe070880807d69940d8.tar.gz bcm5719-llvm-a670a0a3aafba2ce41faffe070880807d69940d8.zip | |
LoopVectorize: We don't need an identity element for min/max reductions
We can just use the initial element that feeds the reduction.
max(max(x, y), z) == max(max(x,y), max(x,z))
radar://13723044
llvm-svn: 181141
Diffstat (limited to 'llvm/test/Transforms/LoopVectorize')
| -rw-r--r-- | llvm/test/Transforms/LoopVectorize/minmax_reduction.ll | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/test/Transforms/LoopVectorize/minmax_reduction.ll b/llvm/test/Transforms/LoopVectorize/minmax_reduction.ll index 99dd09386f5..36a8758e2cc 100644 --- a/llvm/test/Transforms/LoopVectorize/minmax_reduction.ll +++ b/llvm/test/Transforms/LoopVectorize/minmax_reduction.ll @@ -6,8 +6,11 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3 ; Signed tests. -; Turn this into a max reduction. +; Turn this into a max reduction. Make sure we use a splat to initialize the +; vector for the reduction. ; CHECK: @max_red +; CHECK: %[[VAR:.*]] = insertelement <2 x i32> undef, i32 %max, i32 0 +; CHECK: {{.*}} = shufflevector <2 x i32> %[[VAR]], <2 x i32> undef, <2 x i32> zeroinitializer ; CHECK: icmp sgt <2 x i32> ; CHECK: select <2 x i1> ; CHECK: middle.block |
