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b9c1ea6dcc
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 |
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