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ARM: Correctly align arguments after a byval struct is passed on the stack 

llvm-svn: 202985
This commit is contained in:
Oliver Stannard 2014-03-05 15:25:27 +00:00
parent 7590be3cfa
commit d55e115b58
8 changed files with 245 additions and 67 deletions
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5
llvm/include/llvm/CodeGen/CallingConvLower.h
View File

@ -404,6 +404,11 @@ public:
ByValRegs.clear();
}
// Rewind byval registers tracking info.
void rewindByValRegsInfo() {
InRegsParamsProceed = 0;
}
ParmContext getCallOrPrologue() const { return CallOrPrologue; }
private:

25
llvm/lib/Target/ARM/ARMFrameLowering.cpp
View File

@ -175,7 +175,7 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
if (MF.getFunction()->getCallingConv() == CallingConv::GHC)
return;
// Allocate the vararg register save area. This is not counted in NumBytes.
// Allocate the vararg register save area.
if (ArgRegsSaveSize) {
emitSPUpdate(isARM, MBB, MBBI, dl, TII, -ArgRegsSaveSize,
MachineInstr::FrameSetup);
@ -188,13 +188,13 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
}
if (!AFI->hasStackFrame()) {
if (NumBytes != 0) {
emitSPUpdate(isARM, MBB, MBBI, dl, TII, -NumBytes,
if (NumBytes - ArgRegsSaveSize != 0) {
emitSPUpdate(isARM, MBB, MBBI, dl, TII, -(NumBytes - ArgRegsSaveSize),
MachineInstr::FrameSetup);
MCSymbol *SPLabel = Context.CreateTempSymbol();
BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::PROLOG_LABEL))
.addSym(SPLabel);
CFAOffset -= NumBytes;
CFAOffset -= NumBytes - ArgRegsSaveSize;
MMI.addFrameInst(MCCFIInstruction::createDefCfaOffset(SPLabel,
CFAOffset));
}
@ -246,12 +246,14 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
// Determine starting offsets of spill areas.
bool HasFP = hasFP(MF);
unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
unsigned DPRCSOffset = NumBytes - (ArgRegsSaveSize + GPRCS1Size
+ GPRCS2Size + DPRCSSize);
unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
int FramePtrOffsetInPush = 0;
if (HasFP) {
FramePtrOffsetInPush = MFI->getObjectOffset(FramePtrSpillFI) + GPRCS1Size;
FramePtrOffsetInPush = MFI->getObjectOffset(FramePtrSpillFI)
+ GPRCS1Size + ArgRegsSaveSize;
AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) +
NumBytes);
}
@ -339,7 +341,7 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
case ARM::LR:
MMI.addFrameInst(MCCFIInstruction::createOffset(SPLabel,
MRI->getDwarfRegNum(Reg, true),
MFI->getObjectOffset(FI) - ArgRegsSaveSize));
MFI->getObjectOffset(FI)));
break;
}
}
@ -390,7 +392,7 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF) const {
case ARM::R12:
if (STI.isTargetMachO()) {
unsigned DwarfReg = MRI->getDwarfRegNum(Reg, true);
unsigned Offset = MFI->getObjectOffset(FI) - ArgRegsSaveSize;
unsigned Offset = MFI->getObjectOffset(FI);
MMI.addFrameInst(
MCCFIInstruction::createOffset(SPLabel, DwarfReg, Offset));
}
@ -536,8 +538,8 @@ void ARMFrameLowering::emitEpilogue(MachineFunction &MF,
return;
if (!AFI->hasStackFrame()) {
if (NumBytes != 0)
emitSPUpdate(isARM, MBB, MBBI, dl, TII, NumBytes);
if (NumBytes - ArgRegsSaveSize != 0)
emitSPUpdate(isARM, MBB, MBBI, dl, TII, NumBytes - ArgRegsSaveSize);
} else {
// Unwind MBBI to point to first LDR / VLDRD.
const uint16_t *CSRegs = RegInfo->getCalleeSavedRegs(&MF);
@ -550,7 +552,8 @@ void ARMFrameLowering::emitEpilogue(MachineFunction &MF,
}
// Move SP to start of FP callee save spill area.
NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
NumBytes -= (ArgRegsSaveSize +
AFI->getGPRCalleeSavedArea1Size() +
AFI->getGPRCalleeSavedArea2Size() +
AFI->getDPRCalleeSavedAreaSize());

129
llvm/lib/Target/ARM/ARMISelLowering.cpp
View File

@ -1826,22 +1826,6 @@ ARMTargetLowering::HandleByVal(
State->getCallOrPrologue() == Call) &&
"unhandled ParmContext");
// For in-prologue parameters handling, we also introduce stack offset
// for byval registers: see CallingConvLower.cpp, CCState::HandleByVal.
// This behaviour outsides AAPCS rules (5.5 Parameters Passing) of how
// NSAA should be evaluted (NSAA means "next stacked argument address").
// So: NextStackOffset = NSAAOffset + SizeOfByValParamsStoredInRegs.
// Then: NSAAOffset = NextStackOffset - SizeOfByValParamsStoredInRegs.
unsigned NSAAOffset = State->getNextStackOffset();
if (State->getCallOrPrologue() != Call) {
for (unsigned i = 0, e = State->getInRegsParamsCount(); i != e; ++i) {
unsigned RB, RE;
State->getInRegsParamInfo(i, RB, RE);
assert(NSAAOffset >= (RE-RB)*4 &&
"Stack offset for byval regs doesn't introduced anymore?");
NSAAOffset -= (RE-RB)*4;
}
}
if ((ARM::R0 <= reg) && (reg <= ARM::R3)) {
if (Subtarget->isAAPCS_ABI() && Align > 4) {
unsigned AlignInRegs = Align / 4;
@ -1856,6 +1840,7 @@ ARMTargetLowering::HandleByVal(
// all remained GPR regs. In that case we can't split parameter, we must
// send it to stack. We also must set NCRN to R4, so waste all
// remained registers.
const unsigned NSAAOffset = State->getNextStackOffset();
if (Subtarget->isAAPCS_ABI() && NSAAOffset != 0 && size > excess) {
while (State->AllocateReg(GPRArgRegs, 4))
;
@ -1875,18 +1860,14 @@ ARMTargetLowering::HandleByVal(
// allocate remained amount of registers we need.
for (unsigned i = reg+1; i != ByValRegEnd; ++i)
State->AllocateReg(GPRArgRegs, 4);
// At a call site, a byval parameter that is split between
// registers and memory needs its size truncated here. In a
// function prologue, such byval parameters are reassembled in
// memory, and are not truncated.
if (State->getCallOrPrologue() == Call) {
// Make remained size equal to 0 in case, when
// the whole structure may be stored into registers.
if (size < excess)
size = 0;
else
size -= excess;
}
// A byval parameter that is split between registers and memory needs its
// size truncated here.
// In the case where the entire structure fits in registers, we set the
// size in memory to zero.
if (size < excess)
size = 0;
else
size -= excess;
}
}
}
@ -2794,7 +2775,9 @@ ARMTargetLowering::StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG,
unsigned OffsetFromOrigArg,
unsigned ArgOffset,
unsigned ArgSize,
bool ForceMutable) const {
bool ForceMutable,
unsigned ByValStoreOffset,
unsigned TotalArgRegsSaveSize) const {
// Currently, two use-cases possible:
// Case #1. Non-var-args function, and we meet first byval parameter.
@ -2831,7 +2814,6 @@ ARMTargetLowering::StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG,
// Note: once stack area for byval/varargs registers
// was initialized, it can't be initialized again.
if (ArgRegsSaveSize) {
unsigned Padding = ArgRegsSaveSize - ArgRegsSize;
if (Padding) {
@ -2840,11 +2822,18 @@ ARMTargetLowering::StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG,
AFI->setStoredByValParamsPadding(Padding);
}
int FrameIndex = MFI->CreateFixedObject(
ArgRegsSaveSize,
Padding + ArgOffset,
false);
int FrameIndex = MFI->CreateFixedObject(ArgRegsSaveSize,
Padding +
ByValStoreOffset -
(int64_t)TotalArgRegsSaveSize,
false);
SDValue FIN = DAG.getFrameIndex(FrameIndex, getPointerTy());
if (Padding) {
MFI->CreateFixedObject(Padding,
ArgOffset + ByValStoreOffset -
(int64_t)ArgRegsSaveSize,
false);
}
SmallVector<SDValue, 4> MemOps;
for (unsigned i = 0; firstRegToSaveIndex < lastRegToSaveIndex;
@ -2872,10 +2861,16 @@ ARMTargetLowering::StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG,
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOps[0], MemOps.size());
return FrameIndex;
} else
} else {
if (ArgSize == 0) {
// We cannot allocate a zero-byte object for the first variadic argument,
// so just make up a size.
ArgSize = 4;
}
// This will point to the next argument passed via stack.
return MFI->CreateFixedObject(
4, AFI->getStoredByValParamsPadding() + ArgOffset, !ForceMutable);
ArgSize, ArgOffset, !ForceMutable);
}
}
// Setup stack frame, the va_list pointer will start from.
@ -2883,6 +2878,7 @@ void
ARMTargetLowering::VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
SDLoc dl, SDValue &Chain,
unsigned ArgOffset,
unsigned TotalArgRegsSaveSize,
bool ForceMutable) const {
MachineFunction &MF = DAG.getMachineFunction();
ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
@ -2894,7 +2890,7 @@ ARMTargetLowering::VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
// argument passed via stack.
int FrameIndex =
StoreByValRegs(CCInfo, DAG, dl, Chain, 0, CCInfo.getInRegsParamsCount(),
0, ArgOffset, 0, ForceMutable);
0, ArgOffset, 0, ForceMutable, 0, TotalArgRegsSaveSize);
AFI->setVarArgsFrameIndex(FrameIndex);
}
@ -2931,6 +2927,51 @@ ARMTargetLowering::LowerFormalArguments(SDValue Chain,
// We also increase this value in case of varargs function.
AFI->setArgRegsSaveSize(0);
unsigned ByValStoreOffset = 0;
unsigned TotalArgRegsSaveSize = 0;
unsigned ArgRegsSaveSizeMaxAlign = 4;
// Calculate the amount of stack space that we need to allocate to store
// byval and variadic arguments that are passed in registers.
// We need to know this before we allocate the first byval or variadic
// argument, as they will be allocated a stack slot below the CFA (Canonical
// Frame Address, the stack pointer at entry to the function).
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
if (VA.isMemLoc()) {
int index = VA.getValNo();
if (index != lastInsIndex) {
ISD::ArgFlagsTy Flags = Ins[index].Flags;
if (Flags.isByVal()) {
unsigned ExtraArgRegsSize;
unsigned ExtraArgRegsSaveSize;
computeRegArea(CCInfo, MF, CCInfo.getInRegsParamsProceed(),
Flags.getByValSize(),
ExtraArgRegsSize, ExtraArgRegsSaveSize);
TotalArgRegsSaveSize += ExtraArgRegsSaveSize;
if (Flags.getByValAlign() > ArgRegsSaveSizeMaxAlign)
ArgRegsSaveSizeMaxAlign = Flags.getByValAlign();
CCInfo.nextInRegsParam();
}
lastInsIndex = index;
}
}
}
CCInfo.rewindByValRegsInfo();
lastInsIndex = -1;
if (isVarArg) {
unsigned ExtraArgRegsSize;
unsigned ExtraArgRegsSaveSize;
computeRegArea(CCInfo, MF, CCInfo.getInRegsParamsCount(), 0,
ExtraArgRegsSize, ExtraArgRegsSaveSize);
TotalArgRegsSaveSize += ExtraArgRegsSaveSize;
}
// If the arg regs save area contains N-byte aligned values, the
// bottom of it must be at least N-byte aligned.
TotalArgRegsSaveSize = RoundUpToAlignment(TotalArgRegsSaveSize, ArgRegsSaveSizeMaxAlign);
TotalArgRegsSaveSize = std::min(TotalArgRegsSaveSize, 16U);
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
std::advance(CurOrigArg, Ins[VA.getValNo()].OrigArgIndex - CurArgIdx);
@ -3029,18 +3070,23 @@ ARMTargetLowering::LowerFormalArguments(SDValue Chain,
// a tail call.
if (Flags.isByVal()) {
unsigned CurByValIndex = CCInfo.getInRegsParamsProceed();
ByValStoreOffset = RoundUpToAlignment(ByValStoreOffset, Flags.getByValAlign());
int FrameIndex = StoreByValRegs(
CCInfo, DAG, dl, Chain, CurOrigArg,
CurByValIndex,
Ins[VA.getValNo()].PartOffset,
VA.getLocMemOffset(),
Flags.getByValSize(),
true /*force mutable frames*/);
true /*force mutable frames*/,
ByValStoreOffset,
TotalArgRegsSaveSize);
ByValStoreOffset += Flags.getByValSize();
ByValStoreOffset = std::min(ByValStoreOffset, 16U);
InVals.push_back(DAG.getFrameIndex(FrameIndex, getPointerTy()));
CCInfo.nextInRegsParam();
} else {
unsigned FIOffset = VA.getLocMemOffset() +
AFI->getStoredByValParamsPadding();
unsigned FIOffset = VA.getLocMemOffset();
int FI = MFI->CreateFixedObject(VA.getLocVT().getSizeInBits()/8,
FIOffset, true);
@ -3058,7 +3104,8 @@ ARMTargetLowering::LowerFormalArguments(SDValue Chain,
// varargs
if (isVarArg)
VarArgStyleRegisters(CCInfo, DAG, dl, Chain,
CCInfo.getNextStackOffset());
CCInfo.getNextStackOffset(),
TotalArgRegsSaveSize);
return Chain;
}

5
llvm/lib/Target/ARM/ARMISelLowering.h
View File

@ -492,11 +492,14 @@ namespace llvm {
unsigned OffsetFromOrigArg,
unsigned ArgOffset,
unsigned ArgSize,
bool ForceMutable) const;
bool ForceMutable,
unsigned ByValStoreOffset,
unsigned TotalArgRegsSaveSize) const;
void VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
SDLoc dl, SDValue &Chain,
unsigned ArgOffset,
unsigned TotalArgRegsSaveSize,
bool ForceMutable = false) const;
void computeRegArea(CCState &CCInfo, MachineFunction &MF,

24
llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
View File

@ -94,6 +94,8 @@ void Thumb1FrameLowering::emitPrologue(MachineFunction &MF) const {
unsigned Align = MF.getTarget().getFrameLowering()->getStackAlignment();
unsigned ArgRegsSaveSize = AFI->getArgRegsSaveSize(Align);
unsigned NumBytes = MFI->getStackSize();
assert(NumBytes >= ArgRegsSaveSize &&
"ArgRegsSaveSize is included in NumBytes");
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
@ -121,13 +123,13 @@ void Thumb1FrameLowering::emitPrologue(MachineFunction &MF) const {
}
if (!AFI->hasStackFrame()) {
if (NumBytes != 0) {
emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -NumBytes,
if (NumBytes - ArgRegsSaveSize != 0) {
emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, -(NumBytes - ArgRegsSaveSize),
MachineInstr::FrameSetup);
MCSymbol *SPLabel = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::PROLOG_LABEL))
.addSym(SPLabel);
CFAOffset -= NumBytes;
CFAOffset -= NumBytes - ArgRegsSaveSize;
MMI.addFrameInst(
MCCFIInstruction::createDefCfaOffset(SPLabel, CFAOffset));
}
@ -168,7 +170,7 @@ void Thumb1FrameLowering::emitPrologue(MachineFunction &MF) const {
}
// Determine starting offsets of spill areas.
unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
unsigned DPRCSOffset = NumBytes - ArgRegsSaveSize - (GPRCS1Size + GPRCS2Size + DPRCSSize);
unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
bool HasFP = hasFP(MF);
@ -219,7 +221,7 @@ void Thumb1FrameLowering::emitPrologue(MachineFunction &MF) const {
case ARM::LR:
MMI.addFrameInst(MCCFIInstruction::createOffset(SPLabel,
MRI->getDwarfRegNum(Reg, true),
MFI->getObjectOffset(FI) - ArgRegsSaveSize));
MFI->getObjectOffset(FI)));
break;
}
}
@ -227,7 +229,8 @@ void Thumb1FrameLowering::emitPrologue(MachineFunction &MF) const {
// Adjust FP so it point to the stack slot that contains the previous FP.
if (HasFP) {
FramePtrOffsetInBlock += MFI->getObjectOffset(FramePtrSpillFI) + GPRCS1Size;
FramePtrOffsetInBlock += MFI->getObjectOffset(FramePtrSpillFI)
+ GPRCS1Size + ArgRegsSaveSize;
AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tADDrSPi), FramePtr)
.addReg(ARM::SP).addImm(FramePtrOffsetInBlock / 4)
.setMIFlags(MachineInstr::FrameSetup));
@ -324,12 +327,14 @@ void Thumb1FrameLowering::emitEpilogue(MachineFunction &MF,
unsigned Align = MF.getTarget().getFrameLowering()->getStackAlignment();
unsigned ArgRegsSaveSize = AFI->getArgRegsSaveSize(Align);
int NumBytes = (int)MFI->getStackSize();
assert(NumBytes >= ArgRegsSaveSize &&
"ArgRegsSaveSize is included in NumBytes");
const uint16_t *CSRegs = RegInfo->getCalleeSavedRegs();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
if (!AFI->hasStackFrame()) {
if (NumBytes != 0)
emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, NumBytes);
if (NumBytes - ArgRegsSaveSize != 0)
emitSPUpdate(MBB, MBBI, TII, dl, *RegInfo, NumBytes - ArgRegsSaveSize);
} else {
// Unwind MBBI to point to first LDR / VLDRD.
if (MBBI != MBB.begin()) {
@ -343,7 +348,8 @@ void Thumb1FrameLowering::emitEpilogue(MachineFunction &MF,
// Move SP to start of FP callee save spill area.
NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
AFI->getGPRCalleeSavedArea2Size() +
AFI->getDPRCalleeSavedAreaSize());
AFI->getDPRCalleeSavedAreaSize() +
ArgRegsSaveSize);
if (AFI->shouldRestoreSPFromFP()) {
NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;

4
llvm/test/CodeGen/ARM/2013-04-05-Small-ByVal-Structs-PR15293.ll
View File

@ -4,8 +4,8 @@
;CHECK-LABEL: foo:
;CHECK: sub sp, sp, #8
;CHECK: push {r11, lr}
;CHECK: str r0, [sp, #8]
;CHECK: add r0, sp, #8
;CHECK: str r0, [sp, #12]
;CHECK: add r0, sp, #12
;CHECK: bl fooUseParam
;CHECK: pop {r11, lr}
;CHECK: add sp, sp, #8

6
llvm/test/CodeGen/ARM/2013-05-02-AAPCS-ByVal-Structs-C4-C5-VFP.ll
View File

@ -23,9 +23,9 @@ define void @foo(double %vfp0, ; --> D0, NSAA=SP
entry:
;CHECK: sub sp, #8
;CHECK: push.w {r11, lr}
;CHECK: add r0, sp, #16
;CHECK: str r2, [sp, #20]
;CHECK: str r1, [sp, #16]
;CHECK: add r0, sp, #8
;CHECK: str r2, [sp, #12]
;CHECK: str r1, [sp, #8]
;CHECK: bl fooUseStruct
call void @fooUseStruct(%st_t* %p1)
ret void

114
llvm/test/CodeGen/ARM/2014-02-21-byval-reg-split-alignment.ll Normal file
View File

@ -0,0 +1,114 @@
; RUN: llc -mtriple=arm-linux-gnueabihf < %s | FileCheck %s
%struct4bytes = type { i32 }
%struct8bytes8align = type { i64 }
%struct12bytes = type { i32, i32, i32 }
declare void @useIntPtr(%struct4bytes*)
declare void @useLong(i64)
declare void @usePtr(%struct8bytes8align*)
; a -> r0
; b -> r1..r3
; c -> sp+0..sp+7
define void @foo1(i32 %a, %struct12bytes* byval %b, i64 %c) {
; CHECK-LABEL: foo1
; CHECK: sub sp, sp, #16
; CHECK: push {r11, lr}
; CHECK: add [[SCRATCH:r[0-9]+]], sp, #12
; CHECK: stm [[SCRATCH]], {r1, r2, r3}
; CHECK: ldr r0, [sp, #24]
; CHECK: ldr r1, [sp, #28]
; CHECK: bl useLong
; CHECK: pop {r11, lr}
; CHECK: add sp, sp, #16
tail call void @useLong(i64 %c)
ret void
}
; a -> r0
; b -> r2..r3
define void @foo2(i32 %a, %struct8bytes8align* byval %b) {
; CHECK-LABEL: foo2
; CHECK: sub sp, sp, #8
; CHECK: push {r11, lr}
; CHECK: add r0, sp, #8
; CHECK: str r3, [sp, #12]
; CHECK: str r2, [sp, #8]
; CHECK: bl usePtr
; CHECK: pop {r11, lr}
; CHECK: add sp, sp, #8
tail call void @usePtr(%struct8bytes8align* %b)
ret void
}
; a -> r0..r1
; b -> r2
define void @foo3(%struct8bytes8align* byval %a, %struct4bytes* byval %b) {
; CHECK-LABEL: foo3
; CHECK: sub sp, sp, #16
; CHECK: push {r11, lr}
; CHECK: add [[SCRATCH:r[0-9]+]], sp, #8
; CHECK: stm [[SCRATCH]], {r0, r1, r2}
; CHECK: add r0, sp, #8
; CHECK: bl usePtr
; CHECK: pop {r11, lr}
; CHECK: add sp, sp, #16
tail call void @usePtr(%struct8bytes8align* %a)
ret void
}
; a -> r0
; b -> r2..r3
define void @foo4(%struct4bytes* byval %a, %struct8bytes8align* byval %b) {
; CHECK-LABEL: foo4
; CHECK: sub sp, sp, #16
; CHECK: push {r11, lr}
; CHECK: str r0, [sp, #8]
; CHECK: add r0, sp, #16
; CHECK: str r3, [sp, #20]
; CHECK: str r2, [sp, #16]
; CHECK: bl usePtr
; CHECK: pop {r11, lr}
; CHECK: add sp, sp, #16
; CHECK: mov pc, lr
tail call void @usePtr(%struct8bytes8align* %b)
ret void
}
; a -> r0..r1
; b -> r2
; c -> r3
define void @foo5(%struct8bytes8align* byval %a, %struct4bytes* byval %b, %struct4bytes* byval %c) {
; CHECK-LABEL: foo5
; CHECK: sub sp, sp, #16
; CHECK: push {r11, lr}
; CHECK: add [[SCRATCH:r[0-9]+]], sp, #8
; CHECK: stm [[SCRATCH]], {r0, r1, r2, r3}
; CHECK: add r0, sp, #8
; CHECK: bl usePtr
; CHECK: pop {r11, lr}
; CHECK: add sp, sp, #16
; CHECK: mov pc, lr
tail call void @usePtr(%struct8bytes8align* %a)
ret void
}
; a..c -> r0..r2
; d -> sp+0..sp+7
define void @foo6(i32 %a, i32 %b, i32 %c, %struct8bytes8align* byval %d) {
; CHECK-LABEL: foo6
; CHECK: push {r11, lr}
; CHECK: add r0, sp, #8
; CHECK: bl usePtr
; CHECK: pop {r11, lr}
; CHECK: mov pc, lr
tail call void @usePtr(%struct8bytes8align* %d)
ret void
}