llvm-project

7e878aaf - [PatternMatch] Add support for capture-and-match (NFC) (#149825)

[PatternMatch] Add support for capture-and-match (NFC) (#149825) When using PatternMatch, there is a common problem where we want to both match something against a pattern, but also capture the value/instruction for various reasons (e.g. to access flags). Currently the two ways to do that is to either capture using m_Value/m_Instruction and do a separate match on the result, or to use the somewhat awkward `m_CombineAnd(m_XYZ, m_Value(V))` pattern. This PR introduces to add a variant of `m_Value`/`m_Instruction` which does both a capture and a match. `m_Value(V, m_XYZ)` is basically equivalent to `m_CombineAnd(m_XYZ, m_Value(V))`. I've ported two InstCombine files to this pattern as a sample.