maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

[AIX] Return the correct set of callee saved regs 

Summary:
r13 isn't reserved on 32-bit AIX, which is reflected in our calling
convention but not callee saved regs.

Reviewers: sfertile, ZarkoCA, cebowleratibm, jasonliu

Reviewed By: sfertile

Subscribers: lei, wuzish, nemanjai, hiraditya, kbarton, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77101
This commit is contained in:
David Tenty 2020-04-17 13:06:08 -04:00
parent 871beba234
commit 6c881bf1fe
2 changed files with 21 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
View File

@ -142,6 +142,8 @@ const MCPhysReg*
PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
const PPCSubtarget &Subtarget = MF->getSubtarget<PPCSubtarget>();
if (MF->getFunction().getCallingConv() == CallingConv::AnyReg) {
if (!TM.isPPC64() && Subtarget.isAIXABI())
report_fatal_error("AnyReg unimplemented on 32-bit AIX.");
if (Subtarget.hasVSX())
return CSR_64_AllRegs_VSX_SaveList;
if (Subtarget.hasAltivec())
@ -149,8 +151,11 @@ PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
return CSR_64_AllRegs_SaveList;
}
if (TM.isPPC64() && MF->getInfo<PPCFunctionInfo>()->isSplitCSR())
if (TM.isPPC64() && MF->getInfo<PPCFunctionInfo>()->isSplitCSR()) {
if (Subtarget.isAIXABI())
report_fatal_error("SplitCSR unimplemented on AIX.");
return CSR_SRV464_TLS_PE_SaveList;
}
// On PPC64, we might need to save r2 (but only if it is not reserved).
// We do not need to treat R2 as callee-saved when using PC-Relative calls
@ -164,6 +169,8 @@ PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
// Cold calling convention CSRs.
if (MF->getFunction().getCallingConv() == CallingConv::Cold) {
if (Subtarget.isAIXABI())
report_fatal_error("Cold calling unimplemented on AIX.");
if (TM.isPPC64()) {
if (Subtarget.hasAltivec())
return SaveR2 ? CSR_SVR64_ColdCC_R2_Altivec_SaveList
@ -186,6 +193,8 @@ PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
return SaveR2 ? CSR_PPC64_R2_SaveList : CSR_PPC64_SaveList;
}
// 32-bit targets.
if (Subtarget.isAIXABI())
return CSR_AIX32_SaveList;
if (Subtarget.hasAltivec())
return CSR_SVR432_Altivec_SaveList;
else if (Subtarget.hasSPE())

11
llvm/test/CodeGen/PowerPC/aix-calleesavedregs.ll Normal file
View File

@ -0,0 +1,11 @@
; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec \
; RUN: -mtriple powerpc-ibm-aix-xcoff -O0 < %s | \
; RUN: FileCheck --check-prefixes=CHECK %s
define void @usethirteen() {
call void asm "nop", "~{r13}"()
ret void
}
; CHECK: stw 13, -4(1)
; CHECK: lwz 13, -4(1)