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KanRobertKanRobert
authoredNov 1, 2023
[NFC][X86] Reorder the registers to reduce unnecessary iterations (#70222)
* Introduce field `PositionOrder` for class `Register` and `RegisterTuples` * If register A's `PositionOrder` < register B's `PositionOrder`, then A is placed before B in the enum in X86GenRegisterInfo.inc * The new order of registers in the enum for X86 will be 1. Registers before AVX512, 2. AVX512 registers (X/YMM16-31, ZMM0-31, K registers) 3. AMX registers (TMM) 4. APX registers (R16-R31) * Add a new target hook `getNumSupportedRegs()` to return the number of registers for the function (may overestimate). * Replace `getNumRegs()` with `getNumSupportedRegs()` in LiveVariables to eliminate iterations on unsupported registers This patch can reduce 0.3% instruction count regression for sqlite3 during compile-stage (O3) by not iterating on APX registers for #67702
·
llvmorg-21-initllvmorg-18.1.0-rc1
1 parent e2550b7 commit 860f9e5

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-60
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13 files changed

+166
-60
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‎llvm/include/llvm/CodeGen/LiveVariables.h

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -147,7 +147,7 @@ class LiveVariables : public MachineFunctionPass {
147147
bool HandlePhysRegKill(Register Reg, MachineInstr *MI);
148148

149149
/// HandleRegMask - Call HandlePhysRegKill for all registers clobbered by Mask.
150-
void HandleRegMask(const MachineOperand&);
150+
void HandleRegMask(const MachineOperand &, unsigned);
151151

152152
void HandlePhysRegUse(Register Reg, MachineInstr &MI);
153153
void HandlePhysRegDef(Register Reg, MachineInstr *MI,
@@ -170,7 +170,8 @@ class LiveVariables : public MachineFunctionPass {
170170
/// is coming from.
171171
void analyzePHINodes(const MachineFunction& Fn);
172172

173-
void runOnInstr(MachineInstr &MI, SmallVectorImpl<unsigned> &Defs);
173+
void runOnInstr(MachineInstr &MI, SmallVectorImpl<unsigned> &Defs,
174+
unsigned NumRegs);
174175

175176
void runOnBlock(MachineBasicBlock *MBB, unsigned NumRegs);
176177
public:

‎llvm/include/llvm/CodeGen/TargetRegisterInfo.h

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -266,6 +266,11 @@ class TargetRegisterInfo : public MCRegisterInfo {
266266
virtual ~TargetRegisterInfo();
267267

268268
public:
269+
/// Return the number of registers for the function. (may overestimate)
270+
virtual unsigned getNumSupportedRegs(const MachineFunction &) const {
271+
return getNumRegs();
272+
}
273+
269274
// Register numbers can represent physical registers, virtual registers, and
270275
// sometimes stack slots. The unsigned values are divided into these ranges:
271276
//

‎llvm/include/llvm/TableGen/Record.h

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2154,6 +2154,11 @@ struct LessRecordRegister {
21542154
};
21552155

21562156
bool operator()(const Record *Rec1, const Record *Rec2) const {
2157+
int64_t LHSPositionOrder = Rec1->getValueAsInt("PositionOrder");
2158+
int64_t RHSPositionOrder = Rec2->getValueAsInt("PositionOrder");
2159+
if (LHSPositionOrder != RHSPositionOrder)
2160+
return LHSPositionOrder < RHSPositionOrder;
2161+
21572162
RecordParts LHSParts(StringRef(Rec1->getName()));
21582163
RecordParts RHSParts(StringRef(Rec2->getName()));
21592164

‎llvm/include/llvm/Target/Target.td

Lines changed: 8 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -205,6 +205,10 @@ class Register<string n, list<string> altNames = []> {
205205
// isConstant - This register always holds a constant value (e.g. the zero
206206
// register in architectures such as MIPS)
207207
bit isConstant = false;
208+
209+
/// PositionOrder - Indicate tablegen to place the newly added register at a later
210+
/// position to avoid iterations on them on unsupported target.
211+
int PositionOrder = 0;
208212
}
209213

210214
// RegisterWithSubRegs - This can be used to define instances of Register which
@@ -417,6 +421,10 @@ class RegisterTuples<list<SubRegIndex> Indices, list<dag> Regs,
417421

418422
// List of asm names for the generated tuple registers.
419423
list<string> RegAsmNames = RegNames;
424+
425+
// PositionOrder - Indicate tablegen to place the newly added register at a later
426+
// position to avoid iterations on them on unsupported target.
427+
int PositionOrder = 0;
420428
}
421429

422430
// RegisterCategory - This class is a list of RegisterClasses that belong to a

‎llvm/lib/CodeGen/LiveVariables.cpp

Lines changed: 10 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -406,11 +406,11 @@ bool LiveVariables::HandlePhysRegKill(Register Reg, MachineInstr *MI) {
406406
return true;
407407
}
408408

409-
void LiveVariables::HandleRegMask(const MachineOperand &MO) {
409+
void LiveVariables::HandleRegMask(const MachineOperand &MO, unsigned NumRegs) {
410410
// Call HandlePhysRegKill() for all live registers clobbered by Mask.
411411
// Clobbered registers are always dead, sp there is no need to use
412412
// HandlePhysRegDef().
413-
for (unsigned Reg = 1, NumRegs = TRI->getNumRegs(); Reg != NumRegs; ++Reg) {
413+
for (unsigned Reg = 1; Reg != NumRegs; ++Reg) {
414414
// Skip dead regs.
415415
if (!PhysRegDef[Reg] && !PhysRegUse[Reg])
416416
continue;
@@ -421,7 +421,8 @@ void LiveVariables::HandleRegMask(const MachineOperand &MO) {
421421
// This avoids needless implicit operands.
422422
unsigned Super = Reg;
423423
for (MCPhysReg SR : TRI->superregs(Reg))
424-
if ((PhysRegDef[SR] || PhysRegUse[SR]) && MO.clobbersPhysReg(SR))
424+
if (SR < NumRegs && (PhysRegDef[SR] || PhysRegUse[SR]) &&
425+
MO.clobbersPhysReg(SR))
425426
Super = SR;
426427
HandlePhysRegKill(Super, nullptr);
427428
}
@@ -478,7 +479,8 @@ void LiveVariables::UpdatePhysRegDefs(MachineInstr &MI,
478479
}
479480

480481
void LiveVariables::runOnInstr(MachineInstr &MI,
481-
SmallVectorImpl<unsigned> &Defs) {
482+
SmallVectorImpl<unsigned> &Defs,
483+
unsigned NumRegs) {
482484
assert(!MI.isDebugOrPseudoInstr());
483485
// Process all of the operands of the instruction...
484486
unsigned NumOperandsToProcess = MI.getNumOperands();
@@ -527,7 +529,7 @@ void LiveVariables::runOnInstr(MachineInstr &MI,
527529

528530
// Process all masked registers. (Call clobbers).
529531
for (unsigned Mask : RegMasks)
530-
HandleRegMask(MI.getOperand(Mask));
532+
HandleRegMask(MI.getOperand(Mask), NumRegs);
531533

532534
// Process all defs.
533535
for (unsigned MOReg : DefRegs) {
@@ -539,7 +541,7 @@ void LiveVariables::runOnInstr(MachineInstr &MI,
539541
UpdatePhysRegDefs(MI, Defs);
540542
}
541543

542-
void LiveVariables::runOnBlock(MachineBasicBlock *MBB, const unsigned NumRegs) {
544+
void LiveVariables::runOnBlock(MachineBasicBlock *MBB, unsigned NumRegs) {
543545
// Mark live-in registers as live-in.
544546
SmallVector<unsigned, 4> Defs;
545547
for (const auto &LI : MBB->liveins()) {
@@ -556,7 +558,7 @@ void LiveVariables::runOnBlock(MachineBasicBlock *MBB, const unsigned NumRegs) {
556558
continue;
557559
DistanceMap.insert(std::make_pair(&MI, Dist++));
558560

559-
runOnInstr(MI, Defs);
561+
runOnInstr(MI, Defs, NumRegs);
560562
}
561563

562564
// Handle any virtual assignments from PHI nodes which might be at the
@@ -597,7 +599,7 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &mf) {
597599
MRI = &mf.getRegInfo();
598600
TRI = MF->getSubtarget().getRegisterInfo();
599601

600-
const unsigned NumRegs = TRI->getNumRegs();
602+
const unsigned NumRegs = TRI->getNumSupportedRegs(mf);
601603
PhysRegDef.assign(NumRegs, nullptr);
602604
PhysRegUse.assign(NumRegs, nullptr);
603605
PHIVarInfo.resize(MF->getNumBlockIDs());

‎llvm/lib/Target/X86/AsmParser/X86Operand.h

Lines changed: 8 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -357,28 +357,28 @@ struct X86Operand final : public MCParsedAsmOperand {
357357
}
358358

359359
bool isMem64_RC128X() const {
360-
return isMem64() && isMemIndexReg(X86::XMM0, X86::XMM31);
360+
return isMem64() && X86II::isXMMReg(Mem.IndexReg);
361361
}
362362
bool isMem128_RC128X() const {
363-
return isMem128() && isMemIndexReg(X86::XMM0, X86::XMM31);
363+
return isMem128() && X86II::isXMMReg(Mem.IndexReg);
364364
}
365365
bool isMem128_RC256X() const {
366-
return isMem128() && isMemIndexReg(X86::YMM0, X86::YMM31);
366+
return isMem128() && X86II::isYMMReg(Mem.IndexReg);
367367
}
368368
bool isMem256_RC128X() const {
369-
return isMem256() && isMemIndexReg(X86::XMM0, X86::XMM31);
369+
return isMem256() && X86II::isXMMReg(Mem.IndexReg);
370370
}
371371
bool isMem256_RC256X() const {
372-
return isMem256() && isMemIndexReg(X86::YMM0, X86::YMM31);
372+
return isMem256() && X86II::isYMMReg(Mem.IndexReg);
373373
}
374374
bool isMem256_RC512() const {
375-
return isMem256() && isMemIndexReg(X86::ZMM0, X86::ZMM31);
375+
return isMem256() && X86II::isZMMReg(Mem.IndexReg);
376376
}
377377
bool isMem512_RC256X() const {
378-
return isMem512() && isMemIndexReg(X86::YMM0, X86::YMM31);
378+
return isMem512() && X86II::isYMMReg(Mem.IndexReg);
379379
}
380380
bool isMem512_RC512() const {
381-
return isMem512() && isMemIndexReg(X86::ZMM0, X86::ZMM31);
381+
return isMem512() && X86II::isZMMReg(Mem.IndexReg);
382382
}
383383
bool isMem512_GR16() const {
384384
if (!isMem512())

‎llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h

Lines changed: 30 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1182,11 +1182,39 @@ namespace X86II {
11821182
}
11831183
}
11841184

1185+
/// \returns true if the register is a XMM.
1186+
inline bool isXMMReg(unsigned RegNo) {
1187+
assert(X86::XMM15 - X86::XMM0 == 15 &&
1188+
"XMM0-15 registers are not continuous");
1189+
assert(X86::XMM31 - X86::XMM16 == 15 &&
1190+
"XMM16-31 registers are not continuous");
1191+
return (RegNo >= X86::XMM0 && RegNo <= X86::XMM15) ||
1192+
(RegNo >= X86::XMM16 && RegNo <= X86::XMM31);
1193+
}
1194+
1195+
/// \returns true if the register is a YMM.
1196+
inline bool isYMMReg(unsigned RegNo) {
1197+
assert(X86::YMM15 - X86::YMM0 == 15 &&
1198+
"YMM0-15 registers are not continuous");
1199+
assert(X86::YMM31 - X86::YMM16 == 15 &&
1200+
"YMM16-31 registers are not continuous");
1201+
return (RegNo >= X86::YMM0 && RegNo <= X86::YMM15) ||
1202+
(RegNo >= X86::YMM16 && RegNo <= X86::YMM31);
1203+
}
1204+
1205+
/// \returns true if the register is a ZMM.
1206+
inline bool isZMMReg(unsigned RegNo) {
1207+
assert(X86::ZMM31 - X86::ZMM0 == 31 && "ZMM registers are not continuous");
1208+
return RegNo >= X86::ZMM0 && RegNo <= X86::ZMM31;
1209+
}
1210+
11851211
/// \returns true if the MachineOperand is a x86-64 extended (r8 or
11861212
/// higher) register, e.g. r8, xmm8, xmm13, etc.
11871213
inline bool isX86_64ExtendedReg(unsigned RegNo) {
1188-
if ((RegNo >= X86::XMM8 && RegNo <= X86::XMM31) ||
1189-
(RegNo >= X86::YMM8 && RegNo <= X86::YMM31) ||
1214+
if ((RegNo >= X86::XMM8 && RegNo <= X86::XMM15) ||
1215+
(RegNo >= X86::XMM16 && RegNo <= X86::XMM31) ||
1216+
(RegNo >= X86::YMM8 && RegNo <= X86::YMM15) ||
1217+
(RegNo >= X86::YMM16 && RegNo <= X86::YMM31) ||
11901218
(RegNo >= X86::ZMM8 && RegNo <= X86::ZMM31))
11911219
return true;
11921220

‎llvm/lib/Target/X86/MCTargetDesc/X86InstComments.cpp

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -234,11 +234,11 @@ using namespace llvm;
234234
CASE_AVX_INS_COMMON(Inst##SS4, , mr_Int)
235235

236236
static unsigned getVectorRegSize(unsigned RegNo) {
237-
if (X86::ZMM0 <= RegNo && RegNo <= X86::ZMM31)
237+
if (X86II::isZMMReg(RegNo))
238238
return 512;
239-
if (X86::YMM0 <= RegNo && RegNo <= X86::YMM31)
239+
if (X86II::isYMMReg(RegNo))
240240
return 256;
241-
if (X86::XMM0 <= RegNo && RegNo <= X86::XMM31)
241+
if (X86II::isXMMReg(RegNo))
242242
return 128;
243243
if (X86::MM0 <= RegNo && RegNo <= X86::MM7)
244244
return 64;

‎llvm/lib/Target/X86/X86RegisterInfo.cpp

Lines changed: 23 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -604,8 +604,9 @@ BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
604604
}
605605
}
606606
if (!Is64Bit || !MF.getSubtarget<X86Subtarget>().hasAVX512()) {
607-
for (unsigned n = 16; n != 32; ++n) {
608-
for (MCRegAliasIterator AI(X86::XMM0 + n, this, true); AI.isValid(); ++AI)
607+
for (unsigned n = 0; n != 16; ++n) {
608+
for (MCRegAliasIterator AI(X86::XMM16 + n, this, true); AI.isValid();
609+
++AI)
609610
Reserved.set(*AI);
610611
}
611612
}
@@ -616,6 +617,26 @@ BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
616617
return Reserved;
617618
}
618619

620+
unsigned X86RegisterInfo::getNumSupportedRegs(const MachineFunction &MF) const {
621+
// All existing Intel CPUs that support AMX support AVX512 and all existing
622+
// Intel CPUs that support APX support AMX. AVX512 implies AVX.
623+
//
624+
// We enumerate the registers in X86GenRegisterInfo.inc in this order:
625+
//
626+
// Registers before AVX512,
627+
// AVX512 registers (X/YMM16-31, ZMM0-31, K registers)
628+
// AMX registers (TMM)
629+
// APX registers (R16-R31)
630+
//
631+
// and try to return the minimum number of registers supported by the target.
632+
633+
assert((X86::R15WH + 1 == X86 ::YMM0) && (X86::YMM15 + 1 == X86::K0) &&
634+
(X86::K6_K7 + 1 == X86::TMMCFG) &&
635+
(X86::TMM7 + 1 == X86::NUM_TARGET_REGS) &&
636+
"Register number may be incorrect");
637+
return X86::NUM_TARGET_REGS;
638+
}
639+
619640
bool X86RegisterInfo::isArgumentRegister(const MachineFunction &MF,
620641
MCRegister Reg) const {
621642
const X86Subtarget &ST = MF.getSubtarget<X86Subtarget>();

‎llvm/lib/Target/X86/X86RegisterInfo.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -51,6 +51,9 @@ class X86RegisterInfo final : public X86GenRegisterInfo {
5151
public:
5252
explicit X86RegisterInfo(const Triple &TT);
5353

54+
/// Return the number of registers for the function.
55+
unsigned getNumSupportedRegs(const MachineFunction &MF) const override;
56+
5457
// FIXME: This should be tablegen'd like getDwarfRegNum is
5558
int getSEHRegNum(unsigned i) const;
5659

‎llvm/lib/Target/X86/X86RegisterInfo.td

Lines changed: 31 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -223,6 +223,8 @@ def XMM13: X86Reg<"xmm13", 13>, DwarfRegNum<[30, -2, -2]>;
223223
def XMM14: X86Reg<"xmm14", 14>, DwarfRegNum<[31, -2, -2]>;
224224
def XMM15: X86Reg<"xmm15", 15>, DwarfRegNum<[32, -2, -2]>;
225225

226+
let PositionOrder = 2 in {
227+
// XMM16-31 registers, used by AVX-512 instructions.
226228
def XMM16: X86Reg<"xmm16", 16>, DwarfRegNum<[67, -2, -2]>;
227229
def XMM17: X86Reg<"xmm17", 17>, DwarfRegNum<[68, -2, -2]>;
228230
def XMM18: X86Reg<"xmm18", 18>, DwarfRegNum<[69, -2, -2]>;
@@ -239,27 +241,51 @@ def XMM28: X86Reg<"xmm28", 28>, DwarfRegNum<[79, -2, -2]>;
239241
def XMM29: X86Reg<"xmm29", 29>, DwarfRegNum<[80, -2, -2]>;
240242
def XMM30: X86Reg<"xmm30", 30>, DwarfRegNum<[81, -2, -2]>;
241243
def XMM31: X86Reg<"xmm31", 31>, DwarfRegNum<[82, -2, -2]>;
244+
}
242245

243246
// YMM0-15 registers, used by AVX instructions and
244247
// YMM16-31 registers, used by AVX-512 instructions.
245-
let SubRegIndices = [sub_xmm] in {
246-
foreach Index = 0-31 in {
248+
let SubRegIndices = [sub_xmm], PositionOrder = 1 in {
249+
foreach Index = 0-15 in {
250+
def YMM#Index : X86Reg<"ymm"#Index, Index, [!cast<X86Reg>("XMM"#Index)]>,
251+
DwarfRegAlias<!cast<X86Reg>("XMM"#Index)>;
252+
}
253+
}
254+
let SubRegIndices = [sub_xmm], PositionOrder = 2 in {
255+
foreach Index = 16-31 in {
247256
def YMM#Index : X86Reg<"ymm"#Index, Index, [!cast<X86Reg>("XMM"#Index)]>,
248257
DwarfRegAlias<!cast<X86Reg>("XMM"#Index)>;
249258
}
250259
}
251260

261+
252262
// ZMM Registers, used by AVX-512 instructions.
253-
let SubRegIndices = [sub_ymm] in {
263+
let SubRegIndices = [sub_ymm], PositionOrder = 2 in {
254264
foreach Index = 0-31 in {
255265
def ZMM#Index : X86Reg<"zmm"#Index, Index, [!cast<X86Reg>("YMM"#Index)]>,
256266
DwarfRegAlias<!cast<X86Reg>("XMM"#Index)>;
257267
}
258268
}
259269

270+
let PositionOrder = 2 in {
271+
// Mask Registers, used by AVX-512 instructions.
272+
def K0 : X86Reg<"k0", 0>, DwarfRegNum<[118, 93, 93]>;
273+
def K1 : X86Reg<"k1", 1>, DwarfRegNum<[119, 94, 94]>;
274+
def K2 : X86Reg<"k2", 2>, DwarfRegNum<[120, 95, 95]>;
275+
def K3 : X86Reg<"k3", 3>, DwarfRegNum<[121, 96, 96]>;
276+
def K4 : X86Reg<"k4", 4>, DwarfRegNum<[122, 97, 97]>;
277+
def K5 : X86Reg<"k5", 5>, DwarfRegNum<[123, 98, 98]>;
278+
def K6 : X86Reg<"k6", 6>, DwarfRegNum<[124, 99, 99]>;
279+
def K7 : X86Reg<"k7", 7>, DwarfRegNum<[125, 100, 100]>;
280+
// Mask register pairs
281+
def KPAIRS : RegisterTuples<[sub_mask_0, sub_mask_1],
282+
[(add K0, K2, K4, K6), (add K1, K3, K5, K7)]>;
283+
}
284+
285+
// TMM registers, used by AMX instructions.
286+
let PositionOrder = 3 in {
260287
// Tile config registers.
261288
def TMMCFG: X86Reg<"tmmcfg", 0>;
262-
263289
// Tile "registers".
264290
def TMM0: X86Reg<"tmm0", 0>;
265291
def TMM1: X86Reg<"tmm1", 1>;
@@ -269,16 +295,7 @@ def TMM4: X86Reg<"tmm4", 4>;
269295
def TMM5: X86Reg<"tmm5", 5>;
270296
def TMM6: X86Reg<"tmm6", 6>;
271297
def TMM7: X86Reg<"tmm7", 7>;
272-
273-
// Mask Registers, used by AVX-512 instructions.
274-
def K0 : X86Reg<"k0", 0>, DwarfRegNum<[118, 93, 93]>;
275-
def K1 : X86Reg<"k1", 1>, DwarfRegNum<[119, 94, 94]>;
276-
def K2 : X86Reg<"k2", 2>, DwarfRegNum<[120, 95, 95]>;
277-
def K3 : X86Reg<"k3", 3>, DwarfRegNum<[121, 96, 96]>;
278-
def K4 : X86Reg<"k4", 4>, DwarfRegNum<[122, 97, 97]>;
279-
def K5 : X86Reg<"k5", 5>, DwarfRegNum<[123, 98, 98]>;
280-
def K6 : X86Reg<"k6", 6>, DwarfRegNum<[124, 99, 99]>;
281-
def K7 : X86Reg<"k7", 7>, DwarfRegNum<[125, 100, 100]>;
298+
}
282299

283300
// Floating point stack registers. These don't map one-to-one to the FP
284301
// pseudo registers, but we still mark them as aliasing FP registers. That
@@ -627,10 +644,6 @@ def VK16 : RegisterClass<"X86", [v16i1], 16, (add VK8)> {let Size = 16;}
627644
def VK32 : RegisterClass<"X86", [v32i1], 32, (add VK16)> {let Size = 32;}
628645
def VK64 : RegisterClass<"X86", [v64i1], 64, (add VK32)> {let Size = 64;}
629646

630-
// Mask register pairs
631-
def KPAIRS : RegisterTuples<[sub_mask_0, sub_mask_1],
632-
[(add K0, K2, K4, K6), (add K1, K3, K5, K7)]>;
633-
634647
def VK1PAIR : RegisterClass<"X86", [untyped], 16, (add KPAIRS)> {let Size = 32;}
635648
def VK2PAIR : RegisterClass<"X86", [untyped], 16, (add KPAIRS)> {let Size = 32;}
636649
def VK4PAIR : RegisterClass<"X86", [untyped], 16, (add KPAIRS)> {let Size = 32;}

‎llvm/test/CodeGen/X86/ipra-reg-usage.ll

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
target triple = "x86_64-unknown-unknown"
44
declare void @bar1()
55
define preserve_allcc void @foo()#0 {
6-
; CHECK: foo Clobbered Registers: $cs $df $ds $eflags $eip $eiz $es $esp $fpcw $fpsw $fs $fs_base $gs $gs_base $hip $hsp $ip $mxcsr $rflags $rip $riz $rsp $sp $sph $spl $ss $ssp $tmmcfg $_eflags $cr0 $cr1 $cr2 $cr3 $cr4 $cr5 $cr6 $cr7 $cr8 $cr9 $cr10 $cr11 $cr12 $cr13 $cr14 $cr15 $dr0 $dr1 $dr2 $dr3 $dr4 $dr5 $dr6 $dr7 $dr8 $dr9 $dr10 $dr11 $dr12 $dr13 $dr14 $dr15 $fp0 $fp1 $fp2 $fp3 $fp4 $fp5 $fp6 $fp7 $k0 $k1 $k2 $k3 $k4 $k5 $k6 $k7 $mm0 $mm1 $mm2 $mm3 $mm4 $mm5 $mm6 $mm7 $r11 $st0 $st1 $st2 $st3 $st4 $st5 $st6 $st7 $tmm0 $tmm1 $tmm2 $tmm3 $tmm4 $tmm5 $tmm6 $tmm7 $xmm16 $xmm17 $xmm18 $xmm19 $xmm20 $xmm21 $xmm22 $xmm23 $xmm24 $xmm25 $xmm26 $xmm27 $xmm28 $xmm29 $xmm30 $xmm31 $ymm0 $ymm1 $ymm2 $ymm3 $ymm4 $ymm5 $ymm6 $ymm7 $ymm8 $ymm9 $ymm10 $ymm11 $ymm12 $ymm13 $ymm14 $ymm15 $ymm16 $ymm17 $ymm18 $ymm19 $ymm20 $ymm21 $ymm22 $ymm23 $ymm24 $ymm25 $ymm26 $ymm27 $ymm28 $ymm29 $ymm30 $ymm31 $zmm0 $zmm1 $zmm2 $zmm3 $zmm4 $zmm5 $zmm6 $zmm7 $zmm8 $zmm9 $zmm10 $zmm11 $zmm12 $zmm13 $zmm14 $zmm15 $zmm16 $zmm17 $zmm18 $zmm19 $zmm20 $zmm21 $zmm22 $zmm23 $zmm24 $zmm25 $zmm26 $zmm27 $zmm28 $zmm29 $zmm30 $zmm31 $r11b $r11bh $r11d $r11w $r11wh $k0_k1 $k2_k3 $k4_k5 $k6_k7
6+
; CHECK: foo Clobbered Registers: $cs $df $ds $eflags $eip $eiz $es $esp $fpcw $fpsw $fs $fs_base $gs $gs_base $hip $hsp $ip $mxcsr $rflags $rip $riz $rsp $sp $sph $spl $ss $ssp $_eflags $cr0 $cr1 $cr2 $cr3 $cr4 $cr5 $cr6 $cr7 $cr8 $cr9 $cr10 $cr11 $cr12 $cr13 $cr14 $cr15 $dr0 $dr1 $dr2 $dr3 $dr4 $dr5 $dr6 $dr7 $dr8 $dr9 $dr10 $dr11 $dr12 $dr13 $dr14 $dr15 $fp0 $fp1 $fp2 $fp3 $fp4 $fp5 $fp6 $fp7 $mm0 $mm1 $mm2 $mm3 $mm4 $mm5 $mm6 $mm7 $r11 $st0 $st1 $st2 $st3 $st4 $st5 $st6 $st7 $r11b $r11bh $r11d $r11w $r11wh $ymm0 $ymm1 $ymm2 $ymm3 $ymm4 $ymm5 $ymm6 $ymm7 $ymm8 $ymm9 $ymm10 $ymm11 $ymm12 $ymm13 $ymm14 $ymm15 $k0 $k1 $k2 $k3 $k4 $k5 $k6 $k7 $xmm16 $xmm17 $xmm18 $xmm19 $xmm20 $xmm21 $xmm22 $xmm23 $xmm24 $xmm25 $xmm26 $xmm27 $xmm28 $xmm29 $xmm30 $xmm31 $ymm16 $ymm17 $ymm18 $ymm19 $ymm20 $ymm21 $ymm22 $ymm23 $ymm24 $ymm25 $ymm26 $ymm27 $ymm28 $ymm29 $ymm30 $ymm31 $zmm0 $zmm1 $zmm2 $zmm3 $zmm4 $zmm5 $zmm6 $zmm7 $zmm8 $zmm9 $zmm10 $zmm11 $zmm12 $zmm13 $zmm14 $zmm15 $zmm16 $zmm17 $zmm18 $zmm19 $zmm20 $zmm21 $zmm22 $zmm23 $zmm24 $zmm25 $zmm26 $zmm27 $zmm28 $zmm29 $zmm30 $zmm31 $k0_k1 $k2_k3 $k4_k5 $k6_k7 $tmmcfg $tmm0 $tmm1 $tmm2 $tmm3 $tmm4 $tmm5 $tmm6 $tmm7
77
call void @bar1()
88
call void @bar2()
99
ret void

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