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ARM: improve WoA ABI conformance for frame register

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Windows on ARM uses R11 for the frame pointer even though the environment is a
pure Thumb-2, thumb-only environment.  Replicate this behaviour to improve
Windows ABI compatibility.  This register is used for fast stack walking, and
thus is part of the Windows ABI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209085 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool
2014-05-18 04:12:52 +00:00
parent 4da07c2038
commit bf3e78f572
3 changed files with 67 additions and 3 deletions
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22
test/CodeGen/ARM/Windows/frame-register.ll Normal file
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; RUN: llc -mtriple thumbv7-windows -disable-fp-elim -filetype asm -o - %s \
; RUN: | FileCheck %s
declare void @callee(i32)
define i32 @calleer(i32 %i) {
entry:
%i.addr = alloca i32, align 4
%j = alloca i32, align 4
store i32 %i, i32* %i.addr, align 4
%0 = load i32* %i.addr, align 4
%add = add nsw i32 %0, 1
store i32 %add, i32* %j, align 4
%1 = load i32* %j, align 4
call void @callee(i32 %1)
%2 = load i32* %j, align 4
%add1 = add nsw i32 %2, 1
ret i32 %add1
}
; CHECK: push.w {r11, lr}