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From: "andrew.n.senkevich at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/67215] -fno-plt needs improvements for x86
Date: Fri, 14 Aug 2015 15:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67215

--- Comment #4 from Andrew Senkevich <andrew.n.senkevich at gmail dot com> ---
-bash-4.2$ cat test.c
extern char* mem(int);
char* arr[32];

void proc(void)
{
  int i;

  for (i=0;i<32;i++)
    arr[i] = mem(128);
}

gcc -pie -fpie -fno-plt -O2  -S test.c -o test_32.S -m32
gcc -pie -fpie -fno-plt -O2  -S test.c -o test_64.S

-bash-4.2$ cat test_32.S
. . .
proc:
.LFB0:
        .cfi_startproc
        call    __x86.get_pc_thunk.ax
        addl    $_GLOBAL_OFFSET_TABLE_, %eax
        pushl   %edi
        .cfi_def_cfa_offset 8
        .cfi_offset 7, -8
        pushl   %esi
        .cfi_def_cfa_offset 12
        .cfi_offset 6, -12
        pushl   %ebx
        .cfi_def_cfa_offset 16
        .cfi_offset 3, -16
        movl    arr@GOT(%eax), %ebx
        movl    mem@GOT(%eax), %esi
        leal    128(%ebx), %edi
        .p2align 4,,10
        .p2align 3
.L2:
        subl    $12, %esp
        .cfi_def_cfa_offset 28
        addl    $4, %ebx
        pushl   $128
        .cfi_def_cfa_offset 32
        call    *%esi
        movl    %eax, -4(%ebx)
        addl    $16, %esp
        .cfi_def_cfa_offset 16
        cmpl    %edi, %ebx
        jne     .L2
        popl    %ebx
        .cfi_restore 3
        .cfi_def_cfa_offset 12
        popl    %esi
        .cfi_restore 6
        .cfi_def_cfa_offset 8
        popl    %edi
        .cfi_restore 7
        .cfi_def_cfa_offset 4
        ret
        .cfi_endproc
.LFE0:
        .size   proc, .-proc
. . .

-bash-4.2$ cat test_64.S
. . .
proc:
.LFB0:
        .cfi_startproc
        pushq   %r12
        .cfi_def_cfa_offset 16
        .cfi_offset 12, -16
        pushq   %rbp
        .cfi_def_cfa_offset 24
        .cfi_offset 6, -24
        pushq   %rbx
        .cfi_def_cfa_offset 32
        .cfi_offset 3, -32
        movq    arr@GOTPCREL(%rip), %rbx
        movq    mem@GOTPCREL(%rip), %rbp
        leaq    256(%rbx), %r12
        .p2align 4,,10
        .p2align 3
.L2:
        movl    $128, %edi
        addq    $8, %rbx
        call    *%rbp
        movq    %rax, -8(%rbx)
        cmpq    %r12, %rbx
        jne     .L2
        popq    %rbx
        .cfi_def_cfa_offset 24
        popq    %rbp
        .cfi_def_cfa_offset 16
        popq    %r12
        .cfi_def_cfa_offset 8
        ret
        .cfi_endproc
.LFE0:
        .size   proc, .-proc
. . .