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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2007-09-28 12:53:01 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2007-09-28 12:53:01 +0000 |
| commit | f12f3a92c9aa66290b5151c11d9fcd61f83eadb7 (patch) | |
| tree | abef4520cbf512c1700dd55b6fa0632e57cce83c /test/CodeGen/X86/memcpy.ll | |
| parent | e4f1f57b1de012f8429aa9d3b64f68f33702caaa (diff) | |
| download | external_llvm-f12f3a92c9aa66290b5151c11d9fcd61f83eadb7.zip external_llvm-f12f3a92c9aa66290b5151c11d9fcd61f83eadb7.tar.gz external_llvm-f12f3a92c9aa66290b5151c11d9fcd61f83eadb7.tar.bz2 | |
Refactor the memcpy lowering for the x86 target.
The only generated code difference is that now we call memcpy when
the size of the array is unknown. This matches GCC behavior and is
better since the run time value can be arbitrarily large.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42433 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/memcpy.ll')
| -rw-r--r-- | test/CodeGen/X86/memcpy.ll | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/test/CodeGen/X86/memcpy.ll b/test/CodeGen/X86/memcpy.ll new file mode 100644 index 0000000..97a2dd5 --- /dev/null +++ b/test/CodeGen/X86/memcpy.ll @@ -0,0 +1,17 @@ +; RUN: llvm-as < %s | llc -march=x86-64 | grep call.*memcpy | count 2 + +declare void @llvm.memcpy.i64(i8*, i8*, i64, i32) + +define i8* @my_memcpy(i8* %a, i8* %b, i64 %n) { +entry: + tail call void @llvm.memcpy.i64( i8* %a, i8* %b, i64 %n, i32 1 ) + ret i8* %a +} + +define i8* @my_memcpy2(i64* %a, i64* %b, i64 %n) { +entry: + %tmp14 = bitcast i64* %a to i8* + %tmp25 = bitcast i64* %b to i8* + tail call void @llvm.memcpy.i64(i8* %tmp14, i8* %tmp25, i64 %n, i32 8 ) + ret i8* %tmp14 +} |