[PATCH] D59227: [GlobalISel][Utils] Teach getConstantVRegVal how to look through trunc and z|sext
Quentin Colombet via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Mar 11 12:15:37 PDT 2019
qcolombet created this revision.
qcolombet added reviewers: aditya_nandakumar, volkan.
Herald added subscribers: jdoerfert, Petar.Avramovic, kristof.beyls, rovka.
Herald added a project: LLVM.
getConstantVRegVal used to only look for G_CONSTANT when looking at
unboxing the value of a vreg. However, constants are sometimes not
directly used and are hidden behind trunc or s|zext chain of computation.
In particular this may be introduced by the legalization process that
doesn't want simplify these patterns because it can lead to infine loop
when legalizing a constant.
Repository:
rL LLVM
https://reviews.llvm.org/D59227
Files:
lib/CodeGen/GlobalISel/Utils.cpp
test/CodeGen/X86/GlobalISel/ashr-scalar.ll
test/CodeGen/X86/GlobalISel/lshr-scalar.ll
test/CodeGen/X86/GlobalISel/shl-scalar.ll
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