How to inline string.h function on linux?
- by tz1
I want to optimize some code such that all the functions in string.h will be inlined. I'm on x86_64.
I've tried -O3, -minline-all-stringops and when I do "nm a.out" it shows it is calling the glibc version.
Checking with gcc -S, I see the calls.
What am I missing? There are dozens of #ifdef _SOME_SETTING_ in string.h, and bits/string3.h shows the inline version, but I don't know how to get there.
for example:
$ cat test.c
include
main() {
char *a, b;
strcpy(b,a);
}
/
When compiled with:
gcc -minline-all-stringops -O6 -I. -S -o test.S test.c
.file "test.c"
.text
.p2align 4,,15
.globl main
.type main, @function
main:
.LFB12:
.cfi_startproc
subq $8, %rsp
.cfi_def_cfa_offset 16
xorl %esi, %esi
xorl %edi, %edi
call strcpy
addq $8, %rsp
.cfi_def_cfa_offset 8
ret
.cfi_endproc
.LFE12:
.size main, .-main
.ident "GCC: (GNU) 4.5.1 20100924 (Red Hat 4.5.1-4)"
.section .note.GNU-stack,"",@progbits
*/
