Kewen Lin 44ace92596 [PowerPC] Exploit power9 new instruction setb ...

Check the expected pattens feeding to SELECT_CC like:
   (select_cc lhs, rhs,  1, (sext (setcc [lr]hs, [lr]hs, cc2)), cc1)
   (select_cc lhs, rhs, -1, (zext (setcc [lr]hs, [lr]hs, cc2)), cc1)
   (select_cc lhs, rhs,  0, (select_cc [lr]hs, [lr]hs,  1, -1, cc2), seteq)
   (select_cc lhs, rhs,  0, (select_cc [lr]hs, [lr]hs, -1,  1, cc2), seteq)
Further transform the sequence to comparison + setb if hits.

Differential Revision: https://reviews.llvm.org/D53275

llvm-svn: 349445

2018-12-18 07:53:26 +00:00

137 KiB

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