llvm-project

eaaea4c0 - [DAGCombiner][GlobalISel] Extract isFusedOp lambda, add FMA contraction test, fix missing isFPExtFoldable check

[DAGCombiner][GlobalISel] Extract isFusedOp lambda, add FMA contraction test, fix missing isFPExtFoldable check Extract the duplicated isFusedOp lambda in visitFADDForFMACombine and visitFSUBForFMACombine into a shared static template function. Add fma-multiple-uses-contraction.ll test file with baseline CHECK lines for testing FMA contraction behavior when fmul has multiple uses. This test will be updated in subsequent patches as contraction prevention logic is added. Fix a missing isFPExtFoldable check in GISel's matchCombineFSubFpExtFMulToFMadOrFMA which could incorrectly fold fsub(fpext(fmul)) into fma on targets where the fpext is not actually foldable (e.g., gfx9-generic). This makes GISel consistent with SDAG, which already checks isFPExtFoldable at all fpext fold sites. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Made-with: Cursor