[PATCH] D131819: [RISCV] Enable isTruncateFree in SDAG for i64->i32 on rv64.

[Craig Topper via Phabricator via llvm-commits]

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We have a good selection of W instructions, so promoting a truncated
value back to i64 is often free.

This appears to be a net code size reduction on SPECINT2006.

This has been split from D130397 <https://reviews.llvm.org/D130397> as one of the patches needed to
complete that.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131819

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-masked-scatter.ll
  llvm/test/CodeGen/RISCV/trunc-free.ll

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