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Author SHA1 Message Date
Layton Kifer
385e9a2a04 [DAGCombiner] Improve shift by select of constant 
Clean up a TODO, to support folding a shift of a constant by a
select of constants, on targets with different shift operand sizes.

Reviewed By: RKSimon, lebedev.ri

Differential Revision: https://reviews.llvm.org/D90349
 2020-12-18 02:21:42 +00:00
Layton Kifer
ac522f8700 [DAGCombiner] Fold (sext (not i1 x)) -> (add (zext i1 x), -1) 
Move fold of (sext (not i1 x)) -> (add (zext i1 x), -1) from X86 to DAGCombiner to improve codegen on other targets.

Differential Revision: https://reviews.llvm.org/D91589
 2020-12-06 11:52:10 -05:00
Sanjay Patel
781c49de9c [AArch64] add tests for (v)select-of-constants; NFC 
These are copied from existing test files in x86/PPC.

llvm-svn: 374568
 2019-10-11 16:10:23 +00:00