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...y, TEST was always used for bits 0-31 and BT was always used for bits 32-63. Since the BT instruction is 16b smaller than TEST for the bits 8-31 case, 32b vs 48b, and not irredeemably slower, it makes sense to use BT in cases where size matters. Similar logic is possible for BTC and BTS. However, LowerToBTC and LowerToBTS would need to be written and used and that's a larger patch. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150124/9f79c1dc/attachment.html> -------------- next part -------------- A no...

...always used for bits 32-63. > > > > Since the BT instruction is 16b smaller than TEST for the bits 8-31 > case, 32b vs 48b, and not irredeemably slower, it makes sense to use BT in > cases where size matters. > > > > Similar logic is possible for BTC and BTS. However, LowerToBTC and > LowerToBTS would need to be written and used and that's a larger patch. > > <pat><tst64.c>_______________________________________________ > > llvm-commits mailing list > > llvm-commits at cs.uiuc.edu > > http://lists.cs.uiuc.edu/mailman/listinfo/llvm...