[PATCH] D75904: [ARM][CodeGen] Fixing stack alignment of HFA arguments on AArch32 PCS

[Lucas Prates via Phabricator via cfe-commits]

pratlucas created this revision.
Herald added subscribers: llvm-commits, cfe-commits, danielkiss, hiraditya, kristof.beyls.
Herald added projects: clang, LLVM.
pratlucas added a parent revision: D75903: [AArch64][CodeGen] Fixing stack alignment of HFA arguments on AArch64 PCS.
pratlucas added reviewers: t.p.northover, olista01, rnk, asl.

Properly complying with AArch32 PCS on the handling of over-aligned HFA
arguments when those are placed on the stack. AAPCS specifies that the
stacked argument address should be adjusted upwards until correctly
aligned for the argument before copying it to memory.

This patch fixes the alignment of these arguments by makign use of the
stack alignment propagated through the `alignstack` IR argument
attribute during the calling convention lowering for ARM targets.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D75904

Files:
  clang/lib/CodeGen/TargetInfo.cpp
  clang/test/CodeGen/arm-aapcs-vfp.c
  llvm/lib/Target/ARM/ARMCallingConv.cpp
  llvm/test/CodeGen/ARM/aapcs-hfa-code.ll

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