[Bug target/19653] New: x87 reg allocated for constants for -mfpmath=sse

["uros at kss-loka dot si" <gcc-bugzilla at gcc dot gnu dot org>]

A self-contained testcase is attached to this bugreport. Please compile it with
-O2 -march=pentium4 -mfpmath=sse -ffast-math.

This part of the testcase:
  ...
  if ( fabs(fabs(NewRay->Direction[Z])- 1.) < .1 ) {
    /* too close to vertical for comfort, so use cross product with horizon */
    up[X] = 0.; up[Y] = 1.; up[Z] = 0.;
  }
  else
  {
    up[X] = 0.; up[Y] = 0.; up[Z] = 1.;
  }

  VCross(n2, NewRay->Direction, up);  VNormalizeEq(n2);
  VCross(n3, NewRay->Direction, n2);  VNormalizeEq(n3);
  ...

will generate:
	jae	.L2
	fldz
	fstl	-112(%ebp)
	movsd	-112(%ebp), %xmm2
	fld1
	fstpl	-112(%ebp)
	movsd	-112(%ebp), %xmm1
.L5:
	fldl	32(%ebx)
	fstpl	-96(%ebp)
	movsd	-96(%ebp), %xmm3
	mulsd	%xmm2, %xmm3
	movapd	%xmm5, %xmm0
	mulsd	%xmm1, %xmm0
	subsd	%xmm0, %xmm3
	fldl	24(%ebx)
	fstpl	-88(%ebp)
	mulsd	-88(%ebp), %xmm2
	xorpd	.LC5, %xmm2
	movsd	-88(%ebp), %xmm4
        ...
.L2:
	fld1
	fstpl	-112(%ebp)
	movsd	-112(%ebp), %xmm2
	fldz
	fstl	-112(%ebp)
	movsd	-112(%ebp), %xmm1
	jmp	.L5

Uros.

-- 
           Summary: x87 reg allocated for constants for -mfpmath=sse
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: uros at kss-loka dot si
                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=19653