| Issue |
144520
|
| Summary |
[RISCV] Enable loop vectorizer register pressure VF pruning again
|
| Labels |
backend:RISC-V
|
| Assignees |
lukel97
|
| Reporter |
lukel97
|
After https://github.com/llvm/llvm-project/pull/132190 we fixed the issue with spilling on https://godbolt.org/z/WcbWGooa4 since we were now pruning VFs that had too high a register pressure, even if `TTI::shouldMaximizeVectorBandwidth` was false.
However this caused some regressions on AArch64 so it was reverted back to only pruning when vector bandwidth was maximized in #141736. This causes the above link to spill again.
We should find a way to enable this pruning again on RISC-V, which may just be a matter of enabling `TTI::shouldMaximizeVectorBandwidth`. We'll need to double check that it doesn't actually cause more spilling in practice.
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