最近アセンブラを弄ってて、気がついたのでメモメモ
アライメントは実行時でなくて、コンパイルで起きるみたい
- コンパイル前
int sub01(char i, char j) { i += j; return i; } void main() { char i = 10; char j = 20; i = sub01(i, j); }
- コンパイルしたところ。
8bitのデータも32bitのデータとしてコンパイルされてます。
つまり、32bitコンパイラではcharを使っても意味が無い。?
.file "test.c" .text .globl sub01 .type sub01, @function sub01: pushl %ebp movl %esp, %ebp subl $8, %esp movl 8(%ebp), %edx movl 12(%ebp), %eax movb %dl, -4(%ebp) movb %al, -8(%ebp) movzbl -4(%ebp), %edx movzbl -8(%ebp), %eax leal (%edx,%eax), %eax movb %al, -4(%ebp) movsbl -4(%ebp),%eax leave ret .size sub01, .-sub01 .globl main .type main, @function main: pushl %ebp movl %esp, %ebp subl $24, %esp movb $10, -1(%ebp) movb $20, -2(%ebp) movsbl -2(%ebp),%edx movsbl -1(%ebp),%eax movl %edx, 4(%esp) movl %eax, (%esp) call sub01 movb %al, -1(%ebp) leave ret .size main, .-main .ident "GCC: (Ubuntu 4.4.1-4ubuntu9) 4.4.1" .section .note.GNU-stack,"",@progbits
コンパイラはGCCです。
間違っていたらスイマセンm。。
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