Article: Nehalem Performance Preview
By: iz (i.delete@this.z.x), April 12, 2009 2:59 am
Room: Moderated Discussions
Paul (no@thanks.com) on 4/12/09 wrote:
---------------------------
>I think that omit-frame-pointer pointer has been part of -O for GCC for a while,
>a lot of work was put in to make debugging possible on x86 without the frame pointer.
Only for x86_64, but 32 bits x86 with gcc 4.3.2:
$ diff -u O2.s O2-omit-frame-pointer.s
--- O2.s 2009-04-12 12:48:27.000000000 +0200
+++ O2-omit-frame-pointer.s 2009-04-12 12:48:37.000000000 +0200
@@ -7,9 +7,7 @@
.globl bla
.type bla, @function
bla:
- pushl %ebp
- movl %esp, %ebp
- subl $8, %esp
+ subl $12, %esp
movl $.LC0, (%esp)
call puts
movl $1, (%esp)
---------------------------
>I think that omit-frame-pointer pointer has been part of -O for GCC for a while,
>a lot of work was put in to make debugging possible on x86 without the frame pointer.
Only for x86_64, but 32 bits x86 with gcc 4.3.2:
$ diff -u O2.s O2-omit-frame-pointer.s
--- O2.s 2009-04-12 12:48:27.000000000 +0200
+++ O2-omit-frame-pointer.s 2009-04-12 12:48:37.000000000 +0200
@@ -7,9 +7,7 @@
.globl bla
.type bla, @function
bla:
- pushl %ebp
- movl %esp, %ebp
- subl $8, %esp
+ subl $12, %esp
movl $.LC0, (%esp)
call puts
movl $1, (%esp)
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