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| author | Craig Topper <craig.topper@sifive.com> | 2022-08-04 11:16:27 -0700 |
|---|---|---|
| committer | Craig Topper <craig.topper@sifive.com> | 2022-08-04 11:25:08 -0700 |
| commit | a2de12c987339f228f7fa412222f7e7746e220ed (patch) | |
| tree | ae0f0a2b115003465087326e6e9bde3d84424b0e /clang/lib/Frontend/CompilerInvocation.cpp | |
| parent | befa77e59a7760d8c4fdd177b234e4a59500f61c (diff) | |
| download | llvm-a2de12c987339f228f7fa412222f7e7746e220ed.zip llvm-a2de12c987339f228f7fa412222f7e7746e220ed.tar.gz llvm-a2de12c987339f228f7fa412222f7e7746e220ed.tar.bz2 | |
[RISCV] Relax a one use restriction performSRACombine
When folding (sra (add (shl X, 32), C1), 32 - C) -> (shl (sext_inreg (add X, C1), C)
ignore the use count on the (shl X, 32).
The sext_inreg after the transform is free. So we're only making
2 new instructions, the add and the shl. So we only need to be
concerned with replacing the original sra+add. The original shl
can have other uses. This helps if there are multiple different
constants being added to the same shl.
Diffstat (limited to 'clang/lib/Frontend/CompilerInvocation.cpp')
0 files changed, 0 insertions, 0 deletions