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[X86][VARARG] Assign MMO earlier to avoid prolog insert point been sunk across VASTART_SAVE_XMM_REGS

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The changes in D80163 defered the assignment of MachineMemOperand (MMO)
until the X86ExpandPseudo pass. This will result in crash due to prolog
insert point been sunk across the pseudo instruction VASTART_SAVE_XMM_REGS.

Moving the assignment to the creation of the node can avoid the problem.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D112859
This commit is contained in:
Phoebe Wang 2021-11-03 09:29:52 +08:00 committed by Tom Stellard
parent 41c85bbb43
commit 19b8368225
6 changed files with 33 additions and 43 deletions
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33
llvm/lib/Target/X86/X86ExpandPseudo.cpp
View File

@ -657,35 +657,24 @@ void X86ExpandPseudo::ExpandVastartSaveXmmRegs(
EntryBlk->end());
TailBlk->transferSuccessorsAndUpdatePHIs(EntryBlk);
int64_t FrameIndex = VAStartPseudoInstr->getOperand(1).getImm();
Register BaseReg;
uint64_t FrameOffset =
X86FL->getFrameIndexReference(*Func, FrameIndex, BaseReg).getFixed();
uint64_t VarArgsRegsOffset = VAStartPseudoInstr->getOperand(2).getImm();
uint64_t FrameOffset = VAStartPseudoInstr->getOperand(4).getImm();
uint64_t VarArgsRegsOffset = VAStartPseudoInstr->getOperand(6).getImm();
// TODO: add support for YMM and ZMM here.
unsigned MOVOpc = STI->hasAVX() ? X86::VMOVAPSmr : X86::MOVAPSmr;
// In the XMM save block, save all the XMM argument registers.
for (int64_t OpndIdx = 3, RegIdx = 0;
for (int64_t OpndIdx = 7, RegIdx = 0;
OpndIdx < VAStartPseudoInstr->getNumOperands() - 1;
OpndIdx++, RegIdx++) {
int64_t Offset = FrameOffset + VarArgsRegsOffset + RegIdx * 16;
MachineMemOperand *MMO = Func->getMachineMemOperand(
MachinePointerInfo::getFixedStack(*Func, FrameIndex, Offset),
MachineMemOperand::MOStore,
/*Size=*/16, Align(16));
BuildMI(GuardedRegsBlk, DL, TII->get(MOVOpc))
.addReg(BaseReg)
.addImm(/*Scale=*/1)
.addReg(/*IndexReg=*/0)
.addImm(/*Disp=*/Offset)
.addReg(/*Segment=*/0)
.addReg(VAStartPseudoInstr->getOperand(OpndIdx).getReg())
.addMemOperand(MMO);
auto NewMI = BuildMI(GuardedRegsBlk, DL, TII->get(MOVOpc));
for (int i = 0; i < X86::AddrNumOperands; ++i) {
if (i == X86::AddrDisp)
NewMI.addImm(FrameOffset + VarArgsRegsOffset + RegIdx * 16);
else
NewMI.add(VAStartPseudoInstr->getOperand(i + 1));
}
NewMI.addReg(VAStartPseudoInstr->getOperand(OpndIdx).getReg());
assert(Register::isPhysicalRegister(
VAStartPseudoInstr->getOperand(OpndIdx).getReg()));
}

14
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -3533,13 +3533,19 @@ void VarArgsLoweringHelper::createVarArgAreaAndStoreRegisters(
SmallVector<SDValue, 12> SaveXMMOps;
SaveXMMOps.push_back(Chain);
SaveXMMOps.push_back(ALVal);
SaveXMMOps.push_back(
DAG.getTargetConstant(FuncInfo->getRegSaveFrameIndex(), DL, MVT::i32));
SaveXMMOps.push_back(RSFIN);
SaveXMMOps.push_back(
DAG.getTargetConstant(FuncInfo->getVarArgsFPOffset(), DL, MVT::i32));
llvm::append_range(SaveXMMOps, LiveXMMRegs);
MemOps.push_back(DAG.getNode(X86ISD::VASTART_SAVE_XMM_REGS, DL,
MVT::Other, SaveXMMOps));
MachineMemOperand *StoreMMO =
DAG.getMachineFunction().getMachineMemOperand(
MachinePointerInfo::getFixedStack(
DAG.getMachineFunction(), FuncInfo->getRegSaveFrameIndex(),
Offset),
MachineMemOperand::MOStore, 128, Align(16));
MemOps.push_back(DAG.getMemIntrinsicNode(X86ISD::VASTART_SAVE_XMM_REGS,
DL, DAG.getVTList(MVT::Other),
SaveXMMOps, MVT::i8, StoreMMO));
}
if (!MemOps.empty())

8
llvm/lib/Target/X86/X86ISelLowering.h
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@ -627,10 +627,6 @@ namespace llvm {
// packed single precision.
DPBF16PS,
// Save xmm argument registers to the stack, according to %al. An operator
// is needed so that this can be expanded with control flow.
VASTART_SAVE_XMM_REGS,
// Windows's _chkstk call to do stack probing.
WIN_ALLOCA,
@ -848,6 +844,10 @@ namespace llvm {
AESENCWIDE256KL,
AESDECWIDE256KL,
// Save xmm argument registers to the stack, according to %al. An operator
// is needed so that this can be expanded with control flow.
VASTART_SAVE_XMM_REGS,
// WARNING: Do not add anything in the end unless you want the node to
// have memop! In fact, starting from FIRST_TARGET_MEMORY_OPCODE all
// opcodes will be thought as target memory ops!

12
llvm/lib/Target/X86/X86InstrCompiler.td
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@ -69,16 +69,12 @@ def : Pat<(X86callseq_start timm:$amt1, timm:$amt2),
let SchedRW = [WriteSystem] in {
// x86-64 va_start lowering magic.
let hasSideEffects = 1, Defs = [EFLAGS] in {
let hasSideEffects = 1, mayStore = 1, Defs = [EFLAGS] in {
def VASTART_SAVE_XMM_REGS : I<0, Pseudo,
(outs),
(ins GR8:$al,
i32imm:$regsavefi, i32imm:$offset,
variable_ops),
"#VASTART_SAVE_XMM_REGS $al, $regsavefi, $offset",
[(X86vastart_save_xmm_regs GR8:$al,
timm:$regsavefi,
timm:$offset),
(ins GR8:$al, i8mem:$regsavefi, variable_ops),
"#VASTART_SAVE_XMM_REGS $al, $regsavefi",
[(X86vastart_save_xmm_regs GR8:$al, addr:$regsavefi),
(implicit EFLAGS)]>;
}

5
llvm/lib/Target/X86/X86InstrInfo.td
View File

@ -91,8 +91,7 @@ def SDT_X86Call : SDTypeProfile<0, -1, [SDTCisVT<0, iPTR>]>;
def SDT_X86NtBrind : SDTypeProfile<0, -1, [SDTCisVT<0, iPTR>]>;
def SDT_X86VASTART_SAVE_XMM_REGS : SDTypeProfile<0, -1, [SDTCisVT<0, i8>,
SDTCisVT<1, iPTR>,
SDTCisVT<2, iPTR>]>;
SDTCisPtrTy<1>]>;
def SDT_X86VAARG : SDTypeProfile<1, -1, [SDTCisPtrTy<0>,
SDTCisPtrTy<1>,
@ -184,7 +183,7 @@ def X86iret : SDNode<"X86ISD::IRET", SDTX86Ret,
def X86vastart_save_xmm_regs :
SDNode<"X86ISD::VASTART_SAVE_XMM_REGS",
SDT_X86VASTART_SAVE_XMM_REGS,
[SDNPHasChain, SDNPVariadic]>;
[SDNPHasChain, SDNPMayStore, SDNPMemOperand, SDNPVariadic]>;
def X86vaarg64 :
SDNode<"X86ISD::VAARG_64", SDT_X86VAARG,
[SDNPHasChain, SDNPMayLoad, SDNPMayStore,

4
llvm/test/CodeGen/X86/vaargs-prolog-insert.ll
View File

@ -5,6 +5,7 @@
define void @reduce(i32, i32, i32, i32, i32, i32, ...) nounwind {
; CHECK-LABEL: reduce:
; CHECK: # %bb.0:
; CHECK-NEXT: subq $56, %rsp
; CHECK-NEXT: testb %al, %al
; CHECK-NEXT: je .LBB0_4
; CHECK-NEXT: # %bb.3:
@ -21,15 +22,14 @@ define void @reduce(i32, i32, i32, i32, i32, i32, ...) nounwind {
; CHECK-NEXT: testb %al, %al
; CHECK-NEXT: jne .LBB0_2
; CHECK-NEXT: # %bb.1:
; CHECK-NEXT: subq $56, %rsp
; CHECK-NEXT: leaq -{{[0-9]+}}(%rsp), %rax
; CHECK-NEXT: movq %rax, 16
; CHECK-NEXT: leaq {{[0-9]+}}(%rsp), %rax
; CHECK-NEXT: movq %rax, 8
; CHECK-NEXT: movl $48, 4
; CHECK-NEXT: movl $48, 0
; CHECK-NEXT: addq $56, %rsp
; CHECK-NEXT: .LBB0_2:
; CHECK-NEXT: addq $56, %rsp
; CHECK-NEXT: retq
br i1 undef, label %8, label %7