Comments (2)
We have some AMDGPU widening at CodeGenPrepare time already. I found this while trying to emulate atomicrmw expansion (also in IR)
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FWIW, the optimization is incorrect because widening may end up reading poison bytes.
But the counterexample is wrong; it should complain about tgt being poison, not UB.
We support this transformation in assembly mode; I didn't realize it was being done in an IR optimization already.
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Related Issues (20)
- Source function always being UB warning may be missing HOT 3
- undesirable poison in return value HOT 1
- target-side padding for non-byte-sized loads/stores HOT 1
- missed alarm? HOT 2
- add support for range attribute in args and ret val
- Unknown command line argument '-tv' HOT 7
- Add support for poison-generating flags `nuw`/`nsw` to `trunc`
- False positive and different refined value of `zext undef` HOT 3
- Errors about unsupported instruction `invoke` HOT 4
- byval arg & memory(argmem) don't work together
- Consider the new 2-phase memory model HOT 2
- Add support for pointers larger than 64 bits HOT 5
- Add support for gep's nuw nusw attributes HOT 2
- bug relating to too-big store? HOT 1
- Add a flag to disable counterexamples with type punning through memory HOT 1
- Issue that cannot see SMT query. HOT 12
- False negative with the sign bit of nans HOT 1
- Incorrect handling of poison values HOT 1
- Incorrect handling of undef values HOT 1
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