[PATCH] D65497: [RISCV] Avoid generating AssertZext for RV64 when lowering floating Libcall

[Shiva Chen via Phabricator via llvm-commits]

shiva0217 updated this revision to Diff 212746.
shiva0217 retitled this revision from "[RISCV] Generate extensions for RV64 when lowering LibCall with i32 type" to "[RISCV] Avoid generating AssertZext for RV64 when lowering floating Libcall".
shiva0217 edited the summary of this revision.
shiva0217 added a comment.

Hi @eli.friedman,

Thanks for pointing me the right direction.
I added `shouldExtendTypeInLibCall` target hook to indicate the Libcall should do the extension or not.
The parameter IsCastFromFloat will be passed to TargetLowering::makeLibCall and shouldExtendTypeInLibCall.  So shouldExtendTypeInLibCall can identify the Type is casting by floating and disable the extensions.
Without generating AssertZext for the Libcall return value, `and` operation for clearing upper bits will be preserved.


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D65497/new/

https://reviews.llvm.org/D65497

Files:
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/RISCV/RISCVISelLowering.cpp
  lib/Target/RISCV/RISCVISelLowering.h
  test/CodeGen/RISCV/rv32i-rv64i-float-double.ll
  test/CodeGen/RISCV/rv64-complex-float.ll

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