On Friday 26 September 2008, john wrote:
> Thanks Mihai DonÃu. Is there any compiler option where i can disable
> inlining for all the static functions of a program instead of doing that
> with __attribute__((noinline)) for each function inside the code. ?
I am not aware of such an option or attribute. Sorry.
> --- On Sat, 27/9/08, Mihai DonÈu <mihai.dontu@xxxxxxxxx> wrote:
> > From: Mihai DonÈu <mihai.dontu@xxxxxxxxx>
> > Subject: Re: how to avoid default inlining of static functions at O3 ?
> > To: gcc-help@xxxxxxxxxxx, fromu2john@xxxxxxxxx
> > Date: Saturday, 27 September, 2008, 12:46 AM
> >
> > On Friday 26 September 2008, john wrote:
> > > Hi,
> > > I am using gcc 3.4.6 (gcc version 3.4.6 20060404
> >
> > (Red Hat 3.4.6-3))
> >
> > > and trying a simple C program which was given at the
> >
> > end of this mail along
> >
> > > with its assembly code.
> > >
> > > I am compiling the program using -O3
> >
> > From gcc info page (function attributes):
> > `noinline': This function attribute prevents a
> > function from being
> > considered for inlining.
> >
> > __attribute__((noinline)) static void test2();
> >
> > > /usr/bin/gcc -c -pipe -m32 -D_REENTRANT -fPIC -W
> >
> > -Wall -Wextra -O -O3
> >
> > > -DSERVER -DMONITORS
> >
> > -DHA_KEY='"NONE"' test.c -S -o test.s
> >
> > > I see that at optimization level O3, the compiler is
> >
> > defaultly inlining my
> >
> > > static functions. Is there a way to avoid inlining
> >
> > static functions for C
> >
> > > programs ?
> > >
> > >
> > > -fno-inline may avoid inlining all functions. There is
> >
> > -fno-default-inline,
> >
> > > but that is for C++.
> > >
> > > Thanks for any help in advance,
> > > Regards
> > > --John
> > >
> > >
> > >
> > > #include<stdio.h>
> > > void test(int a, int b, int c)
> > > {
> > > int d;
> > > d=a*b*c;
> > > printf("%d * %d * %d is
> >
> > %d\n",a,b,c,d);
> >
> > > }
> > >
> > >
> > >
> > > static void test2(int a, int b, int c)
> > > {
> > > int d;
> > > d=a+b+c;
> > > printf("%d + %d + %d is
> >
> > %d\n",a,b,c,d);
> >
> > > }
> > >
> > > int main(int argc, char *argv[])
> > > {
> > > test(1,2,3);
> > > test2(4,5,6);
> > > }
> > >
> > >
> > >
> > > .file "test.c"
> > > .section
> >
> > .rodata.str1.1,"aMS",@
> >
> > > progbits,1
> > > ..LC0:
> > > .string "%d * %d * %d is %d\n"
> > > .text
> > > .p2align 2,,3
> > > ..globl test
> > > .type test, @function
> > > test:
> > > pushl %ebp
> > > movl %esp, %ebp
> > > pushl %esi
> > > movl 8(%ebp), %esi
> > > movl 12(%ebp), %ecx
> > > movl %esi, %eax
> > > pushl %ebx
> > > movl 16(%ebp), %edx
> > > imull %ecx, %eax
> > > subl $12, %esp
> > > imull %edx, %eax
> > > pushl %eax
> > > pushl %edx
> > > pushl %ecx
> > > call .L2
> > > ..L2:
> > > popl %ebx
> > > addl $_GLOBAL_OFFSET_TABLE_+[.-.L2] , %ebx
> > > pushl %esi
> > > leal .LC0@GOTOFF(%ebx), %eax
> > > pushl %eax
> > > call printf@PLT
> > > leal -8(%ebp), %esp
> > > popl %ebx
> > > popl %esi
> > > leave
> > > ret
> > > .size test, .-test
> > > .section .rodata.str1.1
> > > ..LC1:
> > > .string "%d + %d + %d is %d\n"
> > > .text
> > > .p2align 2,,3
> > > ..globl main
> > > .type main, @function
> > > main:
> > > pushl %ebp
> > > movl %esp, %ebp
> > > pushl %ebx
> > > pushl %eax
> > > andl $-16, %esp
> > > subl $20, %esp
> > > pushl $3
> > > pushl $2
> > > pushl $1
> > > call .L5
> > > ..L5:
> > > popl %ebx
> > > addl $_GLOBAL_OFFSET_TABLE_+[.-.L5] , %ebx
> > > call test@PLT
> > > movl $15, (%esp)
> > > pushl $6
> > > pushl $5
> > > pushl $4
> > > leal .LC1@GOTOFF(%ebx), %eax
> > > pushl %eax
> > > call printf@PLT
> > > addl $32, %esp
> > > movl -4(%ebp), %ebx
> > > leave
> > > ret
> > > .size main, .-main
> > > .section
> >
> > .note.GNU-stack,"",@progbits
> >
> > > .ident "GCC: (GNU) 3.4.6 20060404 (Red
> >
> > Hat 3.4.6-3)"
--
Mihai DonÈu
