[Bug middle-end/47466] c++ __builtin_expect() regression

[guillaume at morinfr dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47466

--- Comment #1 from Guillaume Morin <guillaume at morinfr dot org> 2011-01-26 
18:26:34 UTC ---
A recent 4.6 snapshot shows the same issue

    .file    "foo.cpp"
    .text
    .p2align 4,,15
    .globl    test_expect(EnumStruct const&)
    .type    test_expect(EnumStruct const&), @function
test_expect(EnumStruct const&):
.LFB4:
    .cfi_startproc
    subq    $8, %rsp
    .cfi_def_cfa_offset 16
    movsbl    (%rdi), %edx
    xorl    %eax, %eax
    testl    %edx, %edx
    je    .L2
    cmpl    $1, %edx
    je    .L2
    call    unlikelyCall()
    movl    $1, %eax
.L2:
    addq    $8, %rsp
    .cfi_def_cfa_offset 8
    ret
    .cfi_endproc
.LFE4:
    .size    test_expect(EnumStruct const&), .-test_expect(EnumStruct const&)
    .p2align 4,,15
    .globl    test_expect2(EnumStruct const&)
    .type    test_expect2(EnumStruct const&), @function
test_expect2(EnumStruct const&):
.LFB5:
    .cfi_startproc
    subq    $8, %rsp
    .cfi_def_cfa_offset 16
    movsbl    (%rdi), %edx
    xorl    %eax, %eax
    testl    %edx, %edx
    jne    .L10
.L7:
    addq    $8, %rsp
    .cfi_remember_state
    .cfi_def_cfa_offset 8
    ret
.L10:
    .cfi_restore_state
    subl    $1, %edx
    je    .L7
    .p2align 4,,5
    call    unlikelyCall()
    movl    $1, %eax
    jmp    .L7
    .cfi_endproc
.LFE5:
    .size    test_expect2(EnumStruct const&), .-test_expect2(EnumStruct const&)
    .ident    "GCC: (Debian 20110116-1) 4.6.0 20110116 (experimental) [trunk
revision 168860]"
    .section    .note.GNU-stack,"",@progbits