Chris Lattner 6487854b3f Use cute tblgen tricks to make zap handling more powerful. Specifically, ... when the dag combiner simplifies an and mask, notice this and allow those bits to be missing from the zap mask. This compiles Alpha/zapnot4.ll into: sll $16,3,$0 zapnot $0,3,$0 ret $31,($26),1 instead of: ldah $0,1($31) lda $0,-8($0) sll $16,3,$1 and $1,$0,$0 ret $31,($26),1 It would be *really* nice to replace the hunk of code in the AlphaISelDAGToDAG.cpp file that matches (and (srl (x, C), c2) into (SRL (ZAPNOTi)) with a similar pattern, but I've spent enough time poking at alpha. Make andrew will do this. llvm-svn: 30875		2006-10-11 05:13:56 +00:00
llvm	Use cute tblgen tricks to make zap handling more powerful. Specifically,	2006-10-11 05:13:56 +00:00