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| author | Evan Cheng <evan.cheng@apple.com> | 2009-01-21 02:09:05 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-01-21 02:09:05 +0000 |
| commit | aaf414c92c0247025d6cf31f684895fad7b4c293 (patch) | |
| tree | d3407027ef95dfdb0c5c2f85de2c6c59d49d77d9 /test/CodeGen | |
| parent | 677eae3d964d6d9f2d676828aa2dc27542fbef2b (diff) | |
| download | external_llvm-aaf414c92c0247025d6cf31f684895fad7b4c293.zip external_llvm-aaf414c92c0247025d6cf31f684895fad7b4c293.tar.gz external_llvm-aaf414c92c0247025d6cf31f684895fad7b4c293.tar.bz2 | |
Favors generating "not" over "xor -1". For example.
unsigned test(unsigned a) {
return ~a;
}
llvm used to generate:
movl $4294967295, %eax
xorl 4(%esp), %eax
Now it generates:
movl 4(%esp), %eax
notl %eax
It's 3 bytes shorter.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62661 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
| -rw-r--r-- | test/CodeGen/X86/xor_not.ll | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/test/CodeGen/X86/xor_not.ll b/test/CodeGen/X86/xor_not.ll index 1e89ca8..0b1abdf 100644 --- a/test/CodeGen/X86/xor_not.ll +++ b/test/CodeGen/X86/xor_not.ll @@ -1,4 +1,4 @@ -; RUN: llvm-as < %s | llc -march=x86 | grep {not\[lwb\]} | count 3 +; RUN: llvm-as < %s | llc -march=x86 | grep {not\[lwb\]} | count 4 ; RUN: llvm-as < %s | llc -march=x86-64 | grep {not\[lwb\]} | count 4 define i32 @test(i32 %a, i32 %b) nounwind { entry: |