[PATCH] D63615: [WebAssembly] Omit wrap on i64x2.{shl, shr*} ISel when possible

[Thomas Lively via Phabricator via llvm-commits]

tlively created this revision.
tlively added reviewers: dschuff, aheejin.
Herald added subscribers: llvm-commits, sunfish, hiraditya, jgravelle-google, sbc100.
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Since the WebAssembly SIMD shift instructions take i32 operands, we
truncate the i64 operand to <2 x i64> shifts during ISel. When the i64
operand is sign extended from i32, this CL makes it so the sign
extension is dropped instead of a wrap instruction added.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D63615

Files:
  llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
  llvm/test/CodeGen/WebAssembly/simd-arith.ll

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