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Mirror of https://github.com/RPCS3/llvm-mirror
e3a81b796c
'(shr (ctlz (sub Y, Z)), 5)'. The use of xor better exposes the operation to bit-twiddling logic in the dag combiner. For example, this: typedef struct { unsigned prefix : 4; unsigned code : 4; unsigned unsigned_p : 4; } tree_common; int foo(tree_common *a, tree_common *b) { return a->code == b->code; } Now compiles to: _foo: lwz r2, 0(r4) lwz r3, 0(r3) xor r2, r3, r2 rlwinm r2, r2, 28, 28, 31 cntlzw r2, r2 srwi r3, r2, 5 blr instead of: _foo: lbz r2, 3(r4) lbz r3, 3(r3) srwi r2, r2, 4 srwi r3, r3, 4 subf r2, r2, r3 cntlzw r2, r2 srwi r3, r2, 5 blr saving a cycle. llvm-svn: 31725 |
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include/llvm | ||
lib | ||
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Makefile.common | ||
Makefile.config.in | ||
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