[all-commits] [llvm/llvm-project] 393710: Reland "[llvm][AArch64] Ensure stack alignment in ...

[Jon Roelofs via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 393710bbf74c4e7b92226603a18ead0bba70a8a0
      https://github.com/llvm/llvm-project/commit/393710bbf74c4e7b92226603a18ead0bba70a8a0
  Author: Jon Roelofs <jonathan_roelofs at apple.com>
  Date:   2026-09-11 (Fri, 11 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/arm64ec-varargs.ll
    A llvm/test/CodeGen/AArch64/sme-za-tailcall-fpdiff-align.ll

  Log Message:
  -----------
  Reland "[llvm][AArch64] Ensure stack alignment in non-sibcall tail calls with FPDiff" (#220406)

When a caller has a non-multiple of the minimum stack alignment more
argument stack space than the callee it is tail calling, we need to ensure that
the resulting FPDiff's magnitude has been rounded up to a multiple of the
platform's minimum stack alignment.

In this re-land there is a fixup to 234ce03692ede13ffd2fcb35570d801c1e332814,
which, because of the wrong order, wasn't actually moving NumBytes after
FPDiff had been re-aligned.

rdar://184474075



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