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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 | c1738fdadd1c969f13bbf09fe9c36fff56ccd709 (patch) | |
| tree | e97326bd2650fbd99f7751a113e1888449fc852f /test/Transforms | |
| parent | 5c332dbd30d9398ed25b30c3080506f7b8e92290 (diff) | |
| download | llvm-c1738fdadd1c969f13bbf09fe9c36fff56ccd709.tar.gz llvm-c1738fdadd1c969f13bbf09fe9c36fff56ccd709.tar.bz2 llvm-c1738fdadd1c969f13bbf09fe9c36fff56ccd709.tar.xz | |
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181141 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/LoopVectorize/minmax_reduction.ll | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/test/Transforms/LoopVectorize/minmax_reduction.ll b/test/Transforms/LoopVectorize/minmax_reduction.ll index 99dd09386f..36a8758e2c 100644 --- a/test/Transforms/LoopVectorize/minmax_reduction.ll +++ b/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 |