[all-commits] [llvm/llvm-project] 3764d0: [libc][setjmp] make x86_64 longjmp naked (#112581)

[Nick Desaulniers via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3764d0ff15ef281974879002e27857a041bd5b9c
      https://github.com/llvm/llvm-project/commit/3764d0ff15ef281974879002e27857a041bd5b9c
  Author: Nick Desaulniers <nickdesaulniers at users.noreply.github.com>
  Date:   2024-10-17 (Thu, 17 Oct 2024)

  Changed paths:
    M libc/src/setjmp/longjmp.h
    M libc/src/setjmp/x86_64/longjmp.cpp

  Log Message:
  -----------
  [libc][setjmp] make x86_64 longjmp naked (#112581)

The generated asm for x86_64's longjmp has a function prolog and epilog.
The
epilog in particular is unreachable. Convert longjmp to a naked function
to
avoid these spurious instructions in longjmp.

Link: https://github.com/llvm/llvm-project/pull/112437/files#r1802085511



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