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Date: Thu, 03 Nov 2005 16:21:00 -0000
Subject: [Bug tree-optimization/24659]  New: Conversions are not vectorized
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Message-ID: <bug-24659-1649@http.gcc.gnu.org/bugzilla/>
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From: "uros at kss-loka dot si" <gcc-bugzilla@gcc.gnu.org>
X-SW-Source: 2005-11/txt/msg00477.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

Following code should produce a cvtps2pd and cvtpi2pd instructions that operate
on vectors:

void test_fp (float *a, double *b)
{
  int i;

  for (i = 0; i < 4; i++)
    b[i] = (double) a[i];
}

void test_int (int *a, double *b)
{
  int i;

  for (i = 0; i < 4; i++)
    b[i] = (double) a[i];
}

Currently, gcc produces scalar instructions
(gcc -O2 -march=pentium4 -mfpmath=sse -ftree-vectorize):

.L2:
        movss   -4(%ecx,%eax,4), %xmm0
        cvtss2sd        %xmm0, %xmm0
        movsd   %xmm0, -8(%edx,%eax,8)
        addl    $1, %eax
        cmpl    $5, %eax
        jne     .L2

and
.L9:
        cvtsi2sd        -4(%ecx,%eax,4), %xmm0
        movsd   %xmm0, -8(%edx,%eax,8)
        addl    $1, %eax
        cmpl    $5, %eax
        jne     .L9

(BTW: There is also one movss too many in the first example.)


-- 
           Summary: Conversions are not vectorized
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: uros at kss-loka dot si


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24659