[all-commits] [llvm/llvm-project] 1ba5c5: [DAG] Improve folding (sext_in_reg (*_extend_vecto...
Simon Pilgrim via All-commits
all-commits at lists.llvm.org
Thu Mar 18 08:35:31 PDT 2021
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 1ba5c550d418e12a5bdbb884d2f7d94e0efc64ee
https://github.com/llvm/llvm-project/commit/1ba5c550d418e12a5bdbb884d2f7d94e0efc64ee
Author: Simon Pilgrim <llvm-dev at redking.me.uk>
Date: 2021-03-18 (Thu, 18 Mar 2021)
Changed paths:
M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
M llvm/test/CodeGen/X86/vec_saddo.ll
M llvm/test/CodeGen/X86/vec_smulo.ll
M llvm/test/CodeGen/X86/vec_ssubo.ll
M llvm/test/CodeGen/X86/vec_uaddo.ll
M llvm/test/CodeGen/X86/vec_umulo.ll
M llvm/test/CodeGen/X86/vec_usubo.ll
M llvm/test/CodeGen/X86/vsplit-and.ll
Log Message:
-----------
[DAG] Improve folding (sext_in_reg (*_extend_vector_inreg x)) -> (sext_vector_inreg x)
Extend this to support ComputeNumSignBits of the (used) source vector elements so that we can handle more than just the case where we're sext_in_reg from the source element signbit.
Noticed while investigating the poor codegen in D98587.
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