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2 Commits

Author SHA1 Message Date
Eli Friedman 23e60c7893 [AArch64] Add patterns for zext/sext of shift amount. 
Not sure this is the best fix, but it saves an instruction for certain
constructs involving variable shifts.

Differential Revision: https://reviews.llvm.org/D55572

llvm-svn: 351768
 2019-01-22 00:21:35 +00:00
Geoff Berry 98150e3a62 [AArch64] Take advantage of variable shift/rotate amount implicit mod operation. 
Summary:
Optimize code generated for variable shifts/rotates by taking advantage
of the implicit and/mod done on the variable shift amount register.

Resolves bug 27582 and bug 37421.

Reviewers: t.p.northover, qcolombet, MatzeB, javed.absar

Subscribers: rengolin, kristof.beyls, mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D46844

llvm-svn: 333214
 2018-05-24 18:29:42 +00:00