On Thu, 2002-01-24 at 16:55, Richard B. Johnson wrote:
> Don't you wish!
> [snip]
> cmpl $0,8(%ebp) <-------------- Compare against zero.
Ah, but you compiled without optimization. Using your example program,
`gcc -Wall -S example.c' gives me the same output as you. But with -O2
I get:
foo:
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %edx
xorl %eax, %eax
testl %edx, %edx
sete %al
popl %ebp
ret
Which is the XOR and self-test with no constant Oliver described.
Robert Love
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This archive was generated by hypermail 2b29 : Thu Jan 31 2002 - 21:00:25 EST