[PATCH] D131034: [Backend][X86] Improved tail call optimization for functions marked as musttail

[William Junda Huang via Phabricator via llvm-commits]

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Now check if a function call marked as musttail also qualifies as a sibcall,
which means on-stack arguments are already in place before handling the
tail call function.

This also suppress a bug when a musttail call has struct arguments
passed on the stack, the output code results in return address
overwriting. See https://github.com/llvm/llvm-project/issues/56891


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131034

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/musttail-struct.ll
  llvm/test/CodeGen/X86/musttail-tailcc.ll

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