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Date: Fri, 23 Apr 2004 15:09:00 -0000
From: "ahu at ds9a dot nl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20040423142416.15101.ahu@ds9a.nl>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug optimization/15101] New: Trying to use diouble precision SIMD vector causes: internal compiler error: in extract_bit_field, at expmed.c:1152
X-Bugzilla-Reason: CC
X-SW-Source: 2004-04/txt/msg02172.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

The documentation claims that gcc can write out double precision floating point
arithmetic if the hardware can't do it SIMD. 

When compiling with -O3, this results in the ICE above, when compiling without
-O, it produces bogus results.

Compiled with:
gcc -Wall -ggdb -march=pentium3 -msse simd.c -o simd -O3

Code:
typedef int v4df __attribute__ ((mode(V4DF)));
typedef int v4sf __attribute__ ((mode(V4SF)));

union dvector4
{
  v4df vect;
  double e[4];
};

union fvector4
{
  v4sf vect;
  float e[4];
};


int main()
{
  int n;
  union dvector4 a, b;

  a.e[0]=0;
  a.e[1]=10;
  a.e[2]=20;
  a.e[3]=30;

  b.e[0]=0;
  b.e[1]=0;
  b.e[2]=0;
  b.e[3]=0;
    
    
  for(n=0;n<1000;++n) {
    b.vect = b.vect + a.vect;

    /*
    b.e[0] = b.e[0] + a.e[0];
    b.e[1] = b.e[1] + a.e[1];
    b.e[2] = b.e[2] + a.e[2];
    b.e[3] = b.e[3] + a.e[3];
    */
    
  }

  //  printf("%f, %f, %f, %f\n", c.e[0], c.e[1], c.e[2], c.e[3]);
  return 0;
}

-- 
           Summary: Trying to use diouble precision SIMD vector causes:
                    internal compiler error: in extract_bit_field, at
                    expmed.c:1152
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ahu at ds9a dot nl
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15101