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4 Commits

Author SHA1 Message Date
Richard Osborne
0dcde97cbc Add dag combine to simplify lmul(x, 0, a, b) 
llvm-svn: 98258
 2010-03-11 16:26:35 +00:00
Richard Osborne
d400202a43 Fold add(add(mul(x,y),a),b) -> lmul(x,y,a,b) if the intermediate 
results are unused elsewhere.

llvm-svn: 98157
 2010-03-10 16:19:31 +00:00
Richard Osborne
c19c2bd177 Prefer LMUL to MACCU as LMUL has no tied operands. 
llvm-svn: 98153
 2010-03-10 13:27:10 +00:00
Richard Osborne
43210638f1 Custom lower (S|U)MUL_LOHI -> MACC(S|U) 
llvm-svn: 98152
 2010-03-10 13:20:07 +00:00