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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130499 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-04-29 14:09:57 +00:00
parent e02a1501e7
commit ce3a022b8c
1 changed files with 0 additions and 20 deletions
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20
lib/Target/X86/README.txt
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@@ -1727,26 +1727,6 @@ are functionally identical.
//===---------------------------------------------------------------------===// //===---------------------------------------------------------------------===//
Take the following C code:
int x(int y) { return (y & 63) << 14; }
Code produced by gcc:
andl $63, %edi
sall $14, %edi
movl %edi, %eax
ret
Code produced by clang:
shll $14, %edi
movl %edi, %eax
andl $1032192, %eax
ret
The code produced by gcc is 3 bytes shorter. This sort of construct often
shows up with bitfields.
//===---------------------------------------------------------------------===//
Take the following C code: Take the following C code:
int f(int a, int b) { return (unsigned char)a == (unsigned char)b; } int f(int a, int b) { return (unsigned char)a == (unsigned char)b; }