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| author | Dan Gohman <gohman@apple.com> | 2010-12-09 02:52:17 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-12-09 02:52:17 +0000 |
| commit | d8e0c0438ab1ec86b2bd42da7a439caa7f0a61eb (patch) | |
| tree | e40cb8e64fcdfcf9e8d257ff9cea52b233d2af89 /test/Transforms | |
| parent | 1a48c032bd7c240fc4c52aee6dad57f8043a77d9 (diff) | |
| download | llvm-d8e0c0438ab1ec86b2bd42da7a439caa7f0a61eb.tar.gz llvm-d8e0c0438ab1ec86b2bd42da7a439caa7f0a61eb.tar.bz2 llvm-d8e0c0438ab1ec86b2bd42da7a439caa7f0a61eb.tar.xz | |
Really check that the bits that will become zero are actually already zero
before eliminating the operation that zeros them. This fixes rdar://8739316.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121353 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/InstCombine/2010-11-01-lshr-mask.ll | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/test/Transforms/InstCombine/2010-11-01-lshr-mask.ll b/test/Transforms/InstCombine/2010-11-01-lshr-mask.ll index d74c70e4f7..34b165bcbe 100644 --- a/test/Transforms/InstCombine/2010-11-01-lshr-mask.ll +++ b/test/Transforms/InstCombine/2010-11-01-lshr-mask.ll @@ -1,6 +1,7 @@ ; RUN: opt -instcombine -S < %s | FileCheck %s -; <rdar://problem/8606771> +; <rdar://problem/8606771> +; CHECK: @main define i32 @main(i32 %argc) nounwind ssp { entry: %tmp3151 = trunc i32 %argc to i8 @@ -18,3 +19,26 @@ entry: ; CHECK: ret i32 ret i32 %tmp4086 } + +; rdar://8739316 +; CHECK: @foo +define i8 @foo(i8 %arg, i8 %arg1) nounwind { +bb: + %tmp = shl i8 %arg, 7 + %tmp2 = and i8 %arg1, 84 + %tmp3 = and i8 %arg1, -118 + %tmp4 = and i8 %arg1, 33 + %tmp5 = sub i8 -88, %tmp2 + %tmp6 = and i8 %tmp5, 84 + %tmp7 = or i8 %tmp4, %tmp6 + %tmp8 = xor i8 %tmp, %tmp3 + %tmp9 = or i8 %tmp7, %tmp8 + %tmp10 = lshr i8 %tmp8, 7 + %tmp11 = shl i8 %tmp10, 5 + +; CHECK: %0 = lshr i8 %tmp8, 2 +; CHECK: %tmp11 = and i8 %0, 32 + + %tmp12 = xor i8 %tmp11, %tmp9 + ret i8 %tmp12 +} |