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| author | Alex Bradbury <asb@lowrisc.org> | 2022-02-23 11:05:46 +0000 |
|---|---|---|
| committer | Alex Bradbury <asb@lowrisc.org> | 2022-02-23 11:05:46 +0000 |
| commit | c5bcfb983e47167a8a1826c1a64d7aa1849add06 (patch) | |
| tree | ee2fef4a1d949961c378b0bc79c850a428571f02 /llvm/lib/Bitcode/Reader/BitcodeReader.cpp | |
| parent | f84d732f8c1737940afab71824134f41f37a048b (diff) | |
[RISCV] Avoid infinite loop between DAGCombiner::visitMUL and RISCVISelLowering::transformAddImmMulImm
See https://github.com/llvm/llvm-project/issues/53831 for a full discussion.
The basic issue is that DAGCombiner::visitMUL and
RISCVISelLowering;:transformAddImmMullImm get stuck in a loop, as the
current checks in transformAddImmMulImm aren't sufficient to avoid all
cases where DAGCombiner::isMulAddWithConstProfitable might trigger a
transformation. This patch makes transformAddImmMulImm bail out if C0
(the constant used for multiplication) has more than one use.
Differential Revision: https://reviews.llvm.org/D120332
Diffstat (limited to 'llvm/lib/Bitcode/Reader/BitcodeReader.cpp')
0 files changed, 0 insertions, 0 deletions