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| author | Chris Lattner <sabre@nondot.org> | 2010-01-02 22:08:28 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-01-02 22:08:28 +0000 |
| commit | df3d63b896a5435c2d8c06e147e19b2a358d381d (patch) | |
| tree | c57df63a5e1436779525234e211522ecee36e08d /test/Transforms/InstCombine/load-cmp.ll | |
| parent | b4f82b4b4f5b9bb67f10375aa633302fddce82ce (diff) | |
| download | llvm-df3d63b896a5435c2d8c06e147e19b2a358d381d.tar.gz llvm-df3d63b896a5435c2d8c06e147e19b2a358d381d.tar.bz2 llvm-df3d63b896a5435c2d8c06e147e19b2a358d381d.tar.xz | |
teach instcombine to optimize idioms like A[i]&42 == 0. This
occurs in 403.gcc in mode_mask_array, in safe-ctype.c (which
is copied in multiple apps) in _sch_istable, etc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92427 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/load-cmp.ll')
| -rw-r--r-- | test/Transforms/InstCombine/load-cmp.ll | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/load-cmp.ll b/test/Transforms/InstCombine/load-cmp.ll index 69e13cb1d0..6ec5524094 100644 --- a/test/Transforms/InstCombine/load-cmp.ll +++ b/test/Transforms/InstCombine/load-cmp.ll @@ -80,3 +80,15 @@ define i1 @test7(i32 %X) { ; CHECK-NEXT: %R = icmp ugt i32 {{.*}}, 2 ; CHECK-NEXT: ret i1 %R } + +define i1 @test8(i32 %X) { + %P = getelementptr [10 x i16]* @G16, i32 0, i32 %X + %Q = load i16* %P + %R = and i16 %Q, 3 + %S = icmp eq i16 %R, 0 + ret i1 %S +; CHECK: @test8 +; CHECK-NEXT: add i32 %X, -8 +; CHECK-NEXT: %S = icmp ult i32 {{.*}}, 2 +; CHECK-NEXT: ret i1 %S +} |