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SubjectRe: [PATCH 3/3] kmemtrace: Use tracepoints instead of markers.
On Mon, Jan 05, 2009 at 11:05:34AM -0500, Mathieu Desnoyers wrote:
> Hopefully it does, especially when there are no side-effects. Can you
> also try with -Os ?
>
> Mathieu

Here's the disassembled code when using -Os. It seems it's optimised, as
with -O2. My GCC's version is 4.3.2 (Gentoo Linux).

If you want to test yourself, the output was generated with 'objdump -d
-S -a'.

What do you think?

static void print_that(unsigned long num)
{
printf("input << 5 == %lu\n", num);
40062d: 48 c1 e6 05 shl $0x5,%rsi
400631: bf 5e 07 40 00 mov $0x40075e,%edi
400636: 31 c0 xor %eax,%eax
400638: e8 6b fe ff ff callq 4004a8 <printf@plt>
sscanf(argv[2], "%lu", &in);

call_do_something(in);

return 0;
}
40063d: 5a pop %rdx
40063e: 59 pop %rcx
40063f: 31 c0 xor %eax,%eax
400641: 5b pop %rbx
400642: c3 retq


Eduard



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