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Author SHA1 Message Date
Eli Friedman 37a8197b61 Add a small transform: transform -(X<<Y) to (-X<<Y) when the shift has a single 
use and X is free to negate.

llvm-svn: 94941
 2010-01-31 02:30:23 +00:00
Bill Wendling ad7a5b07a7 When the visitSub method was split into visitSub and visitFSub, this xform was 
added to the FSub version. However, the original version of this xform guarded
against doing this for floating point (!Op0->getType()->isFPOrFPVector()).

This is causing LLVM to perform incorrect xforms for code like:

void func(double *rhi, double *rlo, double xh, double xl, double yh, double yl){
  double mh, ml;
  double c = 134217729.0;
  double up, u1, u2, vp, v1, v2;
        
  up = xh*c;
  u1 = (xh - up) + up;
  u2 = xh - u1;
        
  vp = yh*c;
  v1 = (yh - vp) + vp;
  v2 = yh - v1;
        
  mh = xh*yh;
  ml = (((u1*v1 - mh) + (u1*v2)) + (u2*v1)) + (u2*v2);
  ml += xh*yl + xl*yh;
        
  *rhi = mh + ml;
  *rlo = (mh - (*rhi)) + ml;
}

The last line was optimized away, but rl is intended to be the difference
between the infinitely precise result of mh + ml and after it has been rounded
to double precision.

llvm-svn: 93369
 2010-01-13 23:23:17 +00:00
Chris Lattner dec6847bf6 reduce indentation 
llvm-svn: 92766
 2010-01-05 20:56:24 +00:00
Benjamin Kramer a81a6dff0d Convert a ton of simple integer type equality tests to the new predicate. 
llvm-svn: 92760
 2010-01-05 20:07:06 +00:00
Chris Lattner 82aa888e8c split add/sub out to its own file. Eliminate use of 
dyn_castNotVal in the X+~X transform.  dyn_castNotVal is
dramatic overkill for what the xform needed.

llvm-svn: 92704
 2010-01-05 07:18:46 +00:00