6052 2005-02-07 13:07:21 +0300 suboptimal code 2010-11-04 23:25:37 +0300 1 1 4 Development Sisyphus gcc4.4 unstable all Linux CLOSED WORKSFORME P2 normal --- 1 voins glebfm glebfm qa-sisyphus oldest_to_newest 21713 0 voins 2005-02-07 13:07:21 +0300 $ cat > test.c extern int g(int); int f(int x) { return g(x); } $ gcc -S -O3 test.c -o - .file "test.c" .text .p2align 4,,15 .globl f .type f, @function f: pushl %ebp movl %esp, %ebp popl %ebp jmp g .size f, .-f .section .note.GNU-stack,"",@progbits .ident "GCC: (GNU) 3.4.3 20050104 (ALT Linux, build 3.4.3-alt2)" Obviously, pushl/movl/popl code does nothing and can be completely ommited. 37997 1 mike 2006-05-13 18:24:18 +0400 look at 4.1? 38348 2 ldv 2006-05-27 03:02:41 +0400 Same with gcc-4.1.1; maybe I should report it upstream? :) 114840 3 kas 2010-11-04 23:25:37 +0300 It seems fixed in gcc4.5: $ gcc -S -O3 test.c -o - .file "test.c" .text .p2align 4,,15 .globl f .type f, @function f: .LFB0: .cfi_startproc jmp g .cfi_endproc .LFE0: .size f, .-f .ident "GCC: (GNU) 4.5.1 20100924 (ALT Linux 4.5.1-alt1)" .section .note.GNU-stack,"",@progbits