llvm /
llvm /
b5612d0a25ac7497e1000c965126a43640afcf5e [InstCombine] Prune fshl/fshr with masked operands
If a constant shift amount is used, then only some of the LHS/RHS
operand bits are demanded and we may be able to simplify based on
that. InstCombineSimplifyDemanded already had the necessary support
for that, we just weren't calling it with fshl/fshr as root.
In particular, this allows us to relax some masked funnel shifts
into simple shifts, as shown in the tests.
Patch by Shawn Landden.
Differential Revision: https://reviews.llvm.org/D60660
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358515 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed
