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| author | David Green <david.green@arm.com> | 2023-02-27 19:20:10 +0000 |
|---|---|---|
| committer | David Green <david.green@arm.com> | 2023-02-27 19:20:10 +0000 |
| commit | 06daa515b27029885826833a5626937355abc4a1 (patch) | |
| tree | d988d44477bdcc7fd30c4e6761d5a8e84d1e070f /llvm/lib/Bitcode/Writer/BitcodeWriter.cpp | |
| parent | e7b52c46bf31858ad3754a853977ea7da431577e (diff) | |
| download | llvm-06daa515b27029885826833a5626937355abc4a1.zip llvm-06daa515b27029885826833a5626937355abc4a1.tar.gz llvm-06daa515b27029885826833a5626937355abc4a1.tar.bz2 | |
[AArch64] Don't remove free sext_inreg(vector_extract(x)) if it leads to multiple extracts
If we have sext_inreg(vector_extract(x)) but the top bits are not used, DAG
will try to remove the sext_inreg, using vector_extract(x) directly. This can
lead to multiple uses of both sext_inreg(vector_extract(x)) and
vector_extract(x), leading to the generation of both umov and smov extracts.
This adds a target hook to prevent that under AArch64 where the sext_inreg can
be considered free if there are multiple uses of the sext and no uses of the
vector_extract. This helps fix a small regression from D144550.
Differential Revision: https://reviews.llvm.org/D144850
Diffstat (limited to 'llvm/lib/Bitcode/Writer/BitcodeWriter.cpp')
0 files changed, 0 insertions, 0 deletions