[PATCH] D99657: [AArch64][SVE] SVE functions should use the SVE calling convention for fast calls

[Bradley Smith via Phabricator via llvm-commits]

bsmith created this revision.
bsmith added reviewers: paulwalker-arm, joechrisellis, peterwaller-arm, david-arm.
Herald added subscribers: psnobl, hiraditya, kristof.beyls, tschuett.
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bsmith requested review of this revision.
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When an SVE function calls another SVE function using the C calling
convention we use the more efficient SVE VectorCall PCS.  However,
for the Fast calling convention we're incorrectly falling back to
the generic AArch64 PCS.

This patch adds the same "can use SVE vector calling convention"
detection used by CallingConv::C to CallingConv::Fast.

Co-authored-by: Paul Walker <paul.walker at arm.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D99657

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/sve-tailcall.ll

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