===================================================================
cis-lclient02:~/2012/intel64>more max.c
int max(int a, int b);
main () {
   int a, b;
   a = 5; b = 10;
   return max(a, b);
}
int max(int a, int b) {
   int x;
   x = a;
   if (b > a) x = b;
   return x;
}
===================================================================
cis-lclient02:~/2012/intel64>gcc -O0 -omax0.s -S max.c
cis-lclient02:~/2012/intel64>more max0.s
        .file   "max.c"
        .text
.globl main
        .type   main, @function
main:
        pushl   %ebp
        movl    %esp, %ebp
        andl    $-16, %esp
        subl    $32, %esp
        movl    $5, 24(%esp)
        movl    $10, 28(%esp)
        movl    28(%esp), %eax
        movl    %eax, 4(%esp)
        movl    24(%esp), %eax
        movl    %eax, (%esp)
        call    max
        leave
        ret
        .size   main, .-main
.globl max
        .type   max, @function
max:
        pushl   %ebp
        movl    %esp, %ebp
        subl    $16, %esp
        movl    8(%ebp), %eax
        movl    %eax, -4(%ebp)
        movl    12(%ebp), %eax
        cmpl    8(%ebp), %eax
        jle     .L4
        movl    12(%ebp), %eax
        movl    %eax, -4(%ebp)
.L4:
        movl    -4(%ebp), %eax
        leave
        ret
        .size   max, .-max
        .ident  "GCC: (GNU) 4.4.4 20100630 (Red Hat 4.4.4-10)"
        .section        .note.GNU-stack,"",@progbits
===================================================================
cis-lclient02:~/2012/intel64>gcc -O1 -omax1.s -S max.c
cis-lclient02:~/2012/intel64>more max1.s
        .file   "max.c"
        .text
.globl max
        .type   max, @function
max:
        pushl   %ebp
        movl    %esp, %ebp
        movl    8(%ebp), %eax
        movl    12(%ebp), %edx
        cmpl    %eax, %edx
        cmovge  %edx, %eax
        popl    %ebp
        ret
        .size   max, .-max
.globl main
        .type   main, @function
main:
        pushl   %ebp
        movl    %esp, %ebp
        subl    $8, %esp
        movl    $10, 4(%esp)
        movl    $5, (%esp)
        call    max
        leave
        ret
        .size   main, .-main
        .ident  "GCC: (GNU) 4.4.4 20100630 (Red Hat 4.4.4-10)"
        .section        .note.GNU-stack,"",@progbits
===================================================================
cis-lclient02:~/2012/intel64>more max2.s
        .file   "max.c"
        .text
        .p2align 4,,15
.globl main
        .type   main, @function
main:
        pushl   %ebp
        movl    $10, %eax
        movl    %esp, %ebp
        popl    %ebp
        ret
        .size   main, .-main
        .p2align 4,,15
.globl max
        .type   max, @function
max:
        pushl   %ebp
        movl    %esp, %ebp
        movl    8(%ebp), %eax
        movl    12(%ebp), %edx
        popl    %ebp
        cmpl    %eax, %edx
        cmovge  %edx, %eax
        ret
        .size   max, .-max
        .ident  "GCC: (GNU) 4.4.4 20100630 (Red Hat 4.4.4-10)"
        .section        .note.GNU-stack,"",@progbits
cis-lclient02:~/2012/intel64>
===================================================================
cis-lclient02:~/2012/intel64>gcc -O3 -omax3.s -S max.c
cis-lclient02:~/2012/intel64>more max3.s
        .file   "max.c"
        .text
        .p2align 4,,15
.globl main
        .type   main, @function
main:
        pushl   %ebp
        movl    $10, %eax
        movl    %esp, %ebp
        popl    %ebp
        ret
        .size   main, .-main
        .p2align 4,,15
.globl max
        .type   max, @function
max:
        pushl   %ebp
        movl    %esp, %ebp
        movl    8(%ebp), %eax
        movl    12(%ebp), %edx
        popl    %ebp
        cmpl    %eax, %edx
        cmovge  %edx, %eax
        ret
        .size   max, .-max
        .ident  "GCC: (GNU) 4.4.4 20100630 (Red Hat 4.4.4-10)"
        .section        .note.GNU-stack,"",@progbits
cis-lclient02:~/2012/intel64>
===================================================================