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Subject: [Bug target/46295] New: Missing vzeroupper
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46295

           Summary: Missing vzeroupper
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com
                CC: ubizjak@gmail.com


[hjl@gnu-6 969]$ cat z.i 
typedef double VECTOR[3];
typedef double EXPRESS[5];
void Parse_Rel_Factor (EXPRESS Express,int *Terms);
void Parse_Vector (VECTOR Vector)
{
   EXPRESS Express;
   int Terms;
   for (Terms = 0; Terms < 5; Terms++)
     Express[Terms] = 0.0;
   Parse_Rel_Factor(Express,&Terms);
}
[hjl@gnu-6 969]$ make z.s
/export/build/gnu/gcc-avx256/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc-avx256/build-x86_64-linux/gcc/ -O3 -funroll-loops
-ffast-math -mavx   -S z.i
[hjl@gnu-6 969]$ cat z.s
    .file    "z.i"
    .text
    .p2align 4,,15
    .globl    Parse_Vector
    .type    Parse_Vector, @function
Parse_Vector:
.LFB0:
    .cfi_startproc
    pushq    %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    vxorpd    %xmm0, %xmm0, %xmm0
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    andq    $-32, %rsp
    subq    $64, %rsp
    leaq    60(%rsp), %rsi
    movq    %rsp, %rdi
    vmovapd    %ymm0, (%rsp)
    movq    $0, 32(%rsp)
    movl    $5, 60(%rsp)
    call    Parse_Rel_Factor
    leave
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE0:
    .size    Parse_Vector, .-Parse_Vector
    .ident    "GCC: (GNU) 4.6.0 20101103 (experimental)"
    .section    .note.GNU-stack,"",@progbits
[hjl@gnu-6 969]$