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| author | Meador Inge <meadori@codesourcery.com> | 2012-11-11 05:11:20 +0000 |
|---|---|---|
| committer | Meador Inge <meadori@codesourcery.com> | 2012-11-11 05:11:20 +0000 |
| commit | bb51ec8b62c2819882b82a2510bf4df6f459bd51 (patch) | |
| tree | df5b7dc662ea28fb25dd4030a6fec6ac8659af08 /test/Transforms/InstCombine/strncmp-1.ll | |
| parent | 6e1591a5d5fba3bde66e3ffd4dd73edd6b94cecf (diff) | |
| download | llvm-bb51ec8b62c2819882b82a2510bf4df6f459bd51.tar.gz llvm-bb51ec8b62c2819882b82a2510bf4df6f459bd51.tar.bz2 llvm-bb51ec8b62c2819882b82a2510bf4df6f459bd51.tar.xz | |
instcombine: Migrate memcmp optimizations
This patch migrates the memcmp optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167683 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/strncmp-1.ll')
| -rw-r--r-- | test/Transforms/InstCombine/strncmp-1.ll | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/test/Transforms/InstCombine/strncmp-1.ll b/test/Transforms/InstCombine/strncmp-1.ll index 48b26d1a5f..187c2fa50e 100644 --- a/test/Transforms/InstCombine/strncmp-1.ll +++ b/test/Transforms/InstCombine/strncmp-1.ll @@ -67,12 +67,14 @@ define i32 @test5() { } ; strncmp(x,y,1) -> memcmp(x,y,1) -; TODO: Once the memcmp simplifier gets moved into the instcombine pass -; the following memcmp will be folded into two loads and a subtract. define i32 @test6(i8* %str1, i8* %str2) { ; CHECK: @test6 -; CHECK: call i32 @memcmp -; CHECK: ret i32 %memcmp +; CHECK: [[LOAD1:%[a-z]+]] = load i8* %str1, align 1 +; CHECK: [[ZEXT1:%[a-z]+]] = zext i8 [[LOAD1]] to i32 +; CHECK: [[LOAD2:%[a-z]+]] = load i8* %str2, align 1 +; CHECK: [[ZEXT2:%[a-z]+]] = zext i8 [[LOAD2]] to i32 +; CHECK: [[RET:%[a-z]+]] = sub i32 [[ZEXT1]], [[ZEXT2]] +; CHECK: ret i32 [[RET]] %temp1 = call i32 @strncmp(i8* %str1, i8* %str2, i32 1) ret i32 %temp1 |