It seems that it's not just cwtl that gets used unnecessarily. The same
thing happens with out extension instructions, e.g., movzwl:
Disassembly of section .text:
00000000 <foo>:
#include <ctype.h>
int foo(int c) {
0: 55 push %ebp
1: 89 e5 mov %esp,%ebp
return isdigit(c);
3: 8b 45 08 mov 0x8(%ebp),%eax
6: 8b 15 00 00 00 00 mov 0x0,%edx
8: R_386_32 __ctype_b
c: 66 8b 04 42 mov (%edx,%eax,2),%ax
10: 25 00 08 00 00 and $0x800,%eax
15: 0f b7 c0 movzwl %ax,%eax
}
18: 5d pop %ebp
19: c3 ret
--
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Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]>
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