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Target/X86: Save Win64 non-volatile registers in a Win64 ABI function.

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Summary:
This change causes us to actually save non-volatile registers in a Win64
ABI function that calls a System V ABI function, and vice-versa.

Reviewers: rnk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7919

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230714 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Charles Davis 2015-02-27 00:57:01 +00:00
parent a72314cd80
commit d51be017f0
2 changed files with 39 additions and 1 deletions
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12
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -220,6 +220,7 @@ const MCPhysReg *
X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
bool HasAVX = Subtarget.hasAVX();
bool HasAVX512 = Subtarget.hasAVX512();
bool CallsEHReturn = MF->getMMI().callsEHReturn();
assert(MF && "MachineFunction required");
switch (MF->getFunction()->getCallingConv()) {
@ -253,11 +254,16 @@ X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
if (Is64Bit)
return CSR_64_MostRegs_SaveList;
break;
case CallingConv::X86_64_Win64:
return CSR_Win64_SaveList;
case CallingConv::X86_64_SysV:
if (CallsEHReturn)
return CSR_64EHRet_SaveList;
return CSR_64_SaveList;
default:
break;
}
bool CallsEHReturn = MF->getMMI().callsEHReturn();
if (Is64Bit) {
if (IsWin64)
return CSR_Win64_SaveList;
@ -308,6 +314,10 @@ X86RegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
break;
default:
break;
case CallingConv::X86_64_Win64:
return CSR_Win64_RegMask;
case CallingConv::X86_64_SysV:
return CSR_64_RegMask;
}
// Unlike getCalleeSavedRegs(), we don't have MMI so we can't check

28
test/CodeGen/X86/win64_nonvol.ll Normal file
View File

@ -0,0 +1,28 @@
; RUN: llc < %s -mtriple=x86_64-pc-win32 | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-pc-linux | FileCheck %s
; Check that, if a Win64 ABI function calls a SysV ABI function, all the
; Win64 nonvolatile registers get saved.
; CHECK-LABEL: bar:
define x86_64_win64cc void @bar(i32 %a, i32 %b) {
; CHECK-DAG: pushq %rdi
; CHECK-DAG: pushq %rsi
; CHECK-DAG: movaps %xmm6,
; CHECK-DAG: movaps %xmm7,
; CHECK-DAG: movaps %xmm8,
; CHECK-DAG: movaps %xmm9,
; CHECK-DAG: movaps %xmm10,
; CHECK-DAG: movaps %xmm11,
; CHECK-DAG: movaps %xmm12,
; CHECK-DAG: movaps %xmm13,
; CHECK-DAG: movaps %xmm14,
; CHECK-DAG: movaps %xmm15,
; CHECK: callq foo
; CHECK: ret
call x86_64_sysvcc void @foo(i32 %a, i32 %b)
ret void
}
declare x86_64_sysvcc void @foo(i32 %a, i32 %b)