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Date: Tue, 05 May 2009 18:03:00 -0000
Subject: [Bug target/40030]  New: vector float * vector float + vector float should produce only vmaddfp
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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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Take:
#define vector __vector

vector float f(vector float a, vector float b, vector float c)
{
  return a * b + c;
}
--- CUT ---
Currently for Powerpc (with -O2 -maltivec), we get:
        vspltisw 0,-1
        vslw 0,0,0
        vmaddfp 3,2,3,0
        vaddfp 2,3,4

But this should really just produce:
        vmaddfp 2,2,3,4


-- 
           Summary: vector float * vector float + vector float should
                    produce only vmaddfp
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: powerpc*-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40030