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| author | Meador Inge <meadori@codesourcery.com> | 2012-10-13 16:45:32 +0000 |
|---|---|---|
| committer | Meador Inge <meadori@codesourcery.com> | 2012-10-13 16:45:32 +0000 |
| commit | 73d8a5864fe8c52be2b710c10ec155019738aad5 (patch) | |
| tree | 509c384925ba83c09c1e9e4c1a12d64f2e33ac40 /test/Transforms/InstCombine/strncat-1.ll | |
| parent | 5e8904576a5260cfd5b14596e338a4bb25b9817e (diff) | |
| download | llvm-73d8a5864fe8c52be2b710c10ec155019738aad5.tar.gz llvm-73d8a5864fe8c52be2b710c10ec155019738aad5.tar.bz2 llvm-73d8a5864fe8c52be2b710c10ec155019738aad5.tar.xz | |
instcombine: Migrate strcat and strncat optimizations
This patch migrates the strcat and strncat optimizations from the
simplify-libcalls pass into the instcombine library call simplifier.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165874 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/strncat-1.ll')
| -rw-r--r-- | test/Transforms/InstCombine/strncat-1.ll | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/strncat-1.ll b/test/Transforms/InstCombine/strncat-1.ll new file mode 100644 index 0000000000..ad2a18b146 --- /dev/null +++ b/test/Transforms/InstCombine/strncat-1.ll @@ -0,0 +1,37 @@ +; Test that the strncat libcall simplifier works correctly. +; +; RUN: opt < %s -instcombine -S | FileCheck %s + +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" + +@hello = constant [6 x i8] c"hello\00" +@null = constant [1 x i8] zeroinitializer +@null_hello = constant [7 x i8] c"\00hello\00" + +declare i8* @strncat(i8*, i8*, i32) +declare i32 @puts(i8*) + +define i32 @main() { +; CHECK: @main +; CHECK-NOT: call i8* @strncat +; CHECK: call i32 @puts + + %target = alloca [1024 x i8] + %arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 + store i8 0, i8* %arg1 + + ; rslt1 = strncat(target, "hello\00") + %arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 + %rslt1 = call i8* @strncat(i8* %arg1, i8* %arg2, i32 6) + + ; rslt2 = strncat(rslt1, "\00") + %arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 + %rslt2 = call i8* @strncat(i8* %rslt1, i8* %arg3, i32 42) + + ; rslt3 = strncat(rslt2, "\00hello\00") + %arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 + %rslt3 = call i8* @strncat(i8* %rslt2, i8* %arg4, i32 42) + + call i32 @puts(i8* %rslt3) + ret i32 0 +} |