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Date: Mon, 23 Apr 2007 14:27:00 -0000
Subject: [Bug tree-optimization/31667]  New: Integer externsions aren't vectorized
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From: "hjl at lucon dot org" <gcc-bugzilla@gcc.gnu.org>
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SSE4.1 has pmovzx and pmovsx. For code like:

[hjl@gnu-2 vect]$ cat pmovzxbw.c
typedef unsigned char vec_t;
typedef unsigned short vecx_t;

extern __attribute__((aligned(16))) vec_t x [64];
extern __attribute__((aligned(16))) vecx_t y [64];

void
foo ()
{
  int i;

  for (i = 0; i < 64; i++)
    y [i]  = x [i];
}

Icc generates

        pmovzxbw  x(%rip), %xmm0                                #13.14
        pmovzxbw  8+x(%rip), %xmm1                              #13.14
        pmovzxbw  16+x(%rip), %xmm2                             #13.14
        pmovzxbw  24+x(%rip), %xmm3                             #13.14
        pmovzxbw  32+x(%rip), %xmm4                             #13.14
        pmovzxbw  40+x(%rip), %xmm5                             #13.14
        pmovzxbw  48+x(%rip), %xmm6                             #13.14
        pmovzxbw  56+x(%rip), %xmm7                             #13.14
        movdqa    %xmm0, y(%rip)                                #13.5
        movdqa    %xmm1, 16+y(%rip)                             #13.5
        movdqa    %xmm2, 32+y(%rip)                             #13.5
        movdqa    %xmm3, 48+y(%rip)                             #13.5
        movdqa    %xmm4, 64+y(%rip)                             #13.5
        movdqa    %xmm5, 80+y(%rip)                             #13.5
        movdqa    %xmm6, 96+y(%rip)                             #13.5
        movdqa    %xmm7, 112+y(%rip)                            #13.5
        ret                                                     #14.1


-- 
           Summary: Integer externsions aren't vectorized
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl at lucon dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31667