diff options
| author | Chris Lattner <sabre@nondot.org> | 2008-05-08 17:37:37 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-05-08 17:37:37 +0000 |
| commit | 0db40a6528d3a49485b5d718d028f528242caab1 (patch) | |
| tree | 4552fc266a066d3293bde3e93cb635b613cfb999 /test | |
| parent | 845042893d68533202874a00872ede4c410ecbed (diff) | |
| download | external_llvm-0db40a6528d3a49485b5d718d028f528242caab1.zip external_llvm-0db40a6528d3a49485b5d718d028f528242caab1.tar.gz external_llvm-0db40a6528d3a49485b5d718d028f528242caab1.tar.bz2 | |
More than just loads can read from memory: readonly calls like strlen
also need to be checked for memory modifying instructions before we
can sink them. THis fixes the second half of PR2297.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50860 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/InstCombine/2008-05-08-StrLenSink.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/2008-05-08-StrLenSink.ll b/test/Transforms/InstCombine/2008-05-08-StrLenSink.ll new file mode 100644 index 0000000..e81e828 --- /dev/null +++ b/test/Transforms/InstCombine/2008-05-08-StrLenSink.ll @@ -0,0 +1,28 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | %prcontext strlen 1 | not grep ret +; PR2297 +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" +target triple = "i386-apple-darwin8" + +define i32 @a() nounwind { +entry: + %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0] + %tmp1 = call i8* @malloc( i32 10 ) nounwind ; <i8*> [#uses=5] + %tmp3 = getelementptr i8* %tmp1, i32 1 ; <i8*> [#uses=1] + store i8 0, i8* %tmp3, align 1 + %tmp5 = getelementptr i8* %tmp1, i32 0 ; <i8*> [#uses=1] + store i8 1, i8* %tmp5, align 1 + %tmp7 = call i32 @strlen( i8* %tmp1 ) nounwind readonly ; <i32> [#uses=1] + %tmp9 = getelementptr i8* %tmp1, i32 0 ; <i8*> [#uses=1] + store i8 0, i8* %tmp9, align 1 + %tmp11 = call i32 (...)* @b( i8* %tmp1 ) nounwind ; <i32> [#uses=0] + br label %return + +return: ; preds = %entry + ret i32 %tmp7 +} + +declare i8* @malloc(i32) nounwind + +declare i32 @strlen(i8*) nounwind readonly + +declare i32 @b(...) |