Created
June 28, 2012 11:56
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Initialize variables using static functions instead of macros
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.file "test.c" | |
.text | |
.type a, @function | |
a: | |
.LFB0: | |
.cfi_startproc | |
pushq %rbp | |
.cfi_def_cfa_offset 16 | |
movq %rsp, %rbp | |
.cfi_offset 6, -16 | |
.cfi_def_cfa_register 6 | |
movq $10, -8(%rbp) | |
movq -8(%rbp), %rax | |
imulq $48879, %rax, %rax | |
movq %rax, -8(%rbp) | |
movq -8(%rbp), %rax | |
leave | |
ret | |
.cfi_endproc | |
.LFE0: | |
.size a, .-a | |
.type b, @function | |
b: | |
.LFB1: | |
.cfi_startproc | |
pushq %rbp | |
.cfi_def_cfa_offset 16 | |
movq %rsp, %rbp | |
.cfi_offset 6, -16 | |
.cfi_def_cfa_register 6 | |
subq $16, %rsp | |
call a | |
movq %rax, -8(%rbp) | |
movabsq $78288478382, %rax | |
addq %rax, -8(%rbp) | |
movq -8(%rbp), %rax | |
leave | |
ret | |
.cfi_endproc | |
.LFE1: | |
.size b, .-b | |
.type c, @function | |
c: | |
.LFB2: | |
.cfi_startproc | |
pushq %rbp | |
.cfi_def_cfa_offset 16 | |
movq %rsp, %rbp | |
.cfi_offset 6, -16 | |
.cfi_def_cfa_register 6 | |
subq $24, %rsp | |
call b | |
movq %rax, -8(%rbp) | |
salq $7, -8(%rbp) | |
movq -8(%rbp), %rax | |
movq %rax, -24(%rbp) | |
movabsq $-3689348814741910323, %rdx | |
movq -24(%rbp), %rax | |
mulq %rdx | |
movq %rdx, %rax | |
shrq $3, %rax | |
movq %rax, -8(%rbp) | |
movq -8(%rbp), %rax | |
leave | |
ret | |
.cfi_endproc | |
.LFE2: | |
.size c, .-c | |
.section .rodata | |
.LC0: | |
.string "%lu\n" | |
.text | |
.globl main | |
.type main, @function | |
main: | |
.LFB3: | |
.cfi_startproc | |
pushq %rbp | |
.cfi_def_cfa_offset 16 | |
movq %rsp, %rbp | |
.cfi_offset 6, -16 | |
.cfi_def_cfa_register 6 | |
subq $32, %rsp | |
movl %edi, -20(%rbp) | |
movq %rsi, -32(%rbp) | |
call c | |
movq %rax, -8(%rbp) | |
movl $.LC0, %eax | |
movq -8(%rbp), %rdx | |
movq %rdx, %rsi | |
movq %rax, %rdi | |
movl $0, %eax | |
call printf | |
movl $0, %eax | |
leave | |
ret | |
.cfi_endproc | |
.LFE3: | |
.size main, .-main | |
.ident "GCC: (Debian 4.4.5-8) 4.4.5" | |
.section .note.GNU-stack,"",@progbits |
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.file "test.c" | |
.section .rodata.str1.1,"aMS",@progbits,1 | |
.LC0: | |
.string "%lu\n" | |
.text | |
.p2align 4,,15 | |
.globl main | |
.type main, @function | |
main: | |
.LFB14: | |
.cfi_startproc | |
subq $8, %rsp | |
.cfi_def_cfa_offset 16 | |
movabsq $1002098779801, %rsi | |
movl $.LC0, %edi | |
xorl %eax, %eax | |
call printf | |
xorl %eax, %eax | |
addq $8, %rsp | |
ret | |
.cfi_endproc | |
.LFE14: | |
.size main, .-main | |
.ident "GCC: (Debian 4.4.5-8) 4.4.5" | |
.section .note.GNU-stack,"",@progbits |
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#include <stdio.h> | |
#include <stdlib.h> | |
#define __STDC_FORMAT_MACROS | |
#include <inttypes.h> | |
static uint64_t | |
a(void) | |
{ | |
uint64_t x = 10; | |
x *= 0xbeef; | |
return x; | |
} | |
static uint64_t | |
b(void) | |
{ | |
uint64_t x = a(); | |
x += 78288478382; | |
return x; | |
} | |
static uint64_t | |
c(void) | |
{ | |
uint64_t x = b(); | |
x <<= 7; | |
x /= 10; | |
return x; | |
} | |
int | |
main(int argc, char *argv[]) | |
{ | |
(void) argc; | |
(void) argv; | |
uint64_t x = c(); | |
printf("%" PRIu64 "\n", x); | |
return 0; | |
} |
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