def SDT_X86SEG_ALLOCA : SDTypeProfile<1, 1, [SDTCisVT<0, iPTR>, SDTCisVT<1, iPTR>]>;
-def SDT_X86WIN_FTOL : SDTypeProfile<0, 1, [SDTCisFP<0>]>;
-
def SDT_X86EHRET : SDTypeProfile<0, 1, [SDTCisInt<0>]>;
def SDT_X86TCRET : SDTypeProfile<0, 2, [SDTCisPtrTy<0>, SDTCisVT<1, i32>]>;
def X86Wrapper : SDNode<"X86ISD::Wrapper", SDTX86Wrapper>;
def X86WrapperRIP : SDNode<"X86ISD::WrapperRIP", SDTX86Wrapper>;
-def X86RecoverFrameAlloc : SDNode<"ISD::FRAME_ALLOC_RECOVER",
+def X86RecoverFrameAlloc : SDNode<"ISD::LOCAL_RECOVER",
SDTypeProfile<1, 1, [SDTCisSameAs<0, 1>,
SDTCisInt<1>]>>;
def X86TLSCall : SDNode<"X86ISD::TLSCALL", SDT_X86TLSCALL,
[SDNPHasChain, SDNPOptInGlue, SDNPOutGlue]>;
-def X86WinFTOL : SDNode<"X86ISD::WIN_FTOL", SDT_X86WIN_FTOL,
- [SDNPHasChain, SDNPOutGlue]>;
-
//===----------------------------------------------------------------------===//
// X86 Operand Definitions.
//
def X86MemVX64Operand : AsmOperandClass { let Name = "MemVX64"; }
def X86MemVY64Operand : AsmOperandClass { let Name = "MemVY64"; }
def X86MemVZ64Operand : AsmOperandClass { let Name = "MemVZ64"; }
+ def X86MemVX32XOperand : AsmOperandClass { let Name = "MemVX32X"; }
+ def X86MemVY32XOperand : AsmOperandClass { let Name = "MemVY32X"; }
+ def X86MemVX64XOperand : AsmOperandClass { let Name = "MemVX64X"; }
+ def X86MemVY64XOperand : AsmOperandClass { let Name = "MemVY64X"; }
}
def X86AbsMemAsmOperand : AsmOperandClass {
def vy32mem : X86VMemOperand<VR256, "printi32mem", X86MemVY32Operand>;
def vx64mem : X86VMemOperand<VR128, "printi64mem", X86MemVX64Operand>;
def vy64mem : X86VMemOperand<VR256, "printi64mem", X86MemVY64Operand>;
-def vy64xmem : X86VMemOperand<VR256X, "printi64mem", X86MemVY64Operand>;
+
+def vx32xmem : X86VMemOperand<VR128X, "printi32mem", X86MemVX32XOperand>;
+def vx64xmem : X86VMemOperand<VR128X, "printi32mem", X86MemVX64XOperand>;
+def vy32xmem : X86VMemOperand<VR256X, "printi32mem", X86MemVY32XOperand>;
+def vy64xmem : X86VMemOperand<VR256X, "printi64mem", X86MemVY64XOperand>;
def vz32mem : X86VMemOperand<VR512, "printi32mem", X86MemVZ32Operand>;
def vz64mem : X86VMemOperand<VR512, "printi64mem", X86MemVZ64Operand>;
-// A version of i8mem for use on x86-64 that uses GR64_NOREX instead of
-// plain GR64, so that it doesn't potentially require a REX prefix.
-def i8mem_NOREX : Operand<i64> {
+// A version of i8mem for use on x86-64 and x32 that uses a NOREX GPR instead
+// of a plain GPR, so that it doesn't potentially require a REX prefix.
+def ptr_rc_norex : PointerLikeRegClass<2>;
+def ptr_rc_norex_nosp : PointerLikeRegClass<3>;
+
+def i8mem_NOREX : Operand<iPTR> {
let PrintMethod = "printi8mem";
- let MIOperandInfo = (ops GR64_NOREX, i8imm, GR64_NOREX_NOSP, i32imm, i8imm);
+ let MIOperandInfo = (ops ptr_rc_norex, i8imm, ptr_rc_norex_nosp, i32imm, i8imm);
let ParserMatchClass = X86Mem8AsmOperand;
let OperandType = "OPERAND_MEMORY";
}
// GPRs available for tailcall.
// It represents GR32_TC, GR64_TC or GR64_TCW64.
-def ptr_rc_tailcall : PointerLikeRegClass<2>;
+def ptr_rc_tailcall : PointerLikeRegClass<4>;
// Special i32mem for addresses of load folding tail calls. These are not
// allowed to use callee-saved registers since they must be scheduled
// X86 Complex Pattern Definitions.
//
-// Define X86 specific addressing mode.
-def addr : ComplexPattern<iPTR, 5, "SelectAddr", [], [SDNPWantParent]>;
-def lea32addr : ComplexPattern<i32, 5, "SelectLEAAddr",
+// Define X86-specific addressing mode.
+def addr : ComplexPattern<iPTR, 5, "selectAddr", [], [SDNPWantParent]>;
+def lea32addr : ComplexPattern<i32, 5, "selectLEAAddr",
[add, sub, mul, X86mul_imm, shl, or, frameindex],
[]>;
// In 64-bit mode 32-bit LEAs can use RIP-relative addressing.
-def lea64_32addr : ComplexPattern<i32, 5, "SelectLEA64_32Addr",
+def lea64_32addr : ComplexPattern<i32, 5, "selectLEA64_32Addr",
[add, sub, mul, X86mul_imm, shl, or,
frameindex, X86WrapperRIP],
[]>;
-def tls32addr : ComplexPattern<i32, 5, "SelectTLSADDRAddr",
+def tls32addr : ComplexPattern<i32, 5, "selectTLSADDRAddr",
[tglobaltlsaddr], []>;
-def tls32baseaddr : ComplexPattern<i32, 5, "SelectTLSADDRAddr",
+def tls32baseaddr : ComplexPattern<i32, 5, "selectTLSADDRAddr",
[tglobaltlsaddr], []>;
-def lea64addr : ComplexPattern<i64, 5, "SelectLEAAddr",
+def lea64addr : ComplexPattern<i64, 5, "selectLEAAddr",
[add, sub, mul, X86mul_imm, shl, or, frameindex,
X86WrapperRIP], []>;
-def tls64addr : ComplexPattern<i64, 5, "SelectTLSADDRAddr",
+def tls64addr : ComplexPattern<i64, 5, "selectTLSADDRAddr",
[tglobaltlsaddr], []>;
-def tls64baseaddr : ComplexPattern<i64, 5, "SelectTLSADDRAddr",
+def tls64baseaddr : ComplexPattern<i64, 5, "selectTLSADDRAddr",
[tglobaltlsaddr], []>;
+def vectoraddr : ComplexPattern<iPTR, 5, "selectVectorAddr", [],[SDNPWantParent]>;
+
//===----------------------------------------------------------------------===//
// X86 Instruction Predicate Definitions.
def HasCMov : Predicate<"Subtarget->hasCMov()">;
def NoDQI : Predicate<"!Subtarget->hasDQI()">;
def HasBWI : Predicate<"Subtarget->hasBWI()">,
AssemblerPredicate<"FeatureBWI", "AVX-512 BW ISA">;
+def NoBWI : Predicate<"!Subtarget->hasBWI()">;
def HasVLX : Predicate<"Subtarget->hasVLX()">,
AssemblerPredicate<"FeatureVLX", "AVX-512 VL ISA">;
def NoVLX : Predicate<"!Subtarget->hasVLX()">;
+def NoVLX_Or_NoBWI : Predicate<"!Subtarget->hasVLX() || !Subtarget->hasBWI()">;
def HasPOPCNT : Predicate<"Subtarget->hasPOPCNT()">;
def HasAES : Predicate<"Subtarget->hasAES()">;
+def HasFXSR : Predicate<"Subtarget->hasFXSR()">;
+def HasXSAVE : Predicate<"Subtarget->hasXSAVE()">;
+def HasXSAVEOPT : Predicate<"Subtarget->hasXSAVEOPT()">;
+def HasXSAVEC : Predicate<"Subtarget->hasXSAVEC()">;
+def HasXSAVES : Predicate<"Subtarget->hasXSAVES()">;
def HasPCLMUL : Predicate<"Subtarget->hasPCLMUL()">;
def HasFMA : Predicate<"Subtarget->hasFMA()">;
def UseFMAOnAVX : Predicate<"Subtarget->hasFMA() && !Subtarget->hasAVX512()">;
def HasPrefetchW : Predicate<"Subtarget->hasPRFCHW()">;
def FPStackf32 : Predicate<"!Subtarget->hasSSE1()">;
def FPStackf64 : Predicate<"!Subtarget->hasSSE2()">;
+def HasMPX : Predicate<"Subtarget->hasMPX()">;
def HasCmpxchg16b: Predicate<"Subtarget->hasCmpxchg16b()">;
def Not64BitMode : Predicate<"!Subtarget->is64Bit()">,
AssemblerPredicate<"!Mode64Bit", "Not 64-bit mode">;
return (Imm == X86::COND_E) || (Imm == X86::COND_NE);
}]>;
-let FastIselShouldIgnore = 1 in { // FastIsel should ignore all simm8 instrs.
- def i16immSExt8 : ImmLeaf<i16, [{ return Imm == (int8_t)Imm; }]>;
- def i32immSExt8 : ImmLeaf<i32, [{ return Imm == (int8_t)Imm; }]>;
- def i64immSExt8 : ImmLeaf<i64, [{ return Imm == (int8_t)Imm; }]>;
-}
-def i64immSExt32 : ImmLeaf<i64, [{ return Imm == (int32_t)Imm; }]>;
+def i16immSExt8 : ImmLeaf<i16, [{ return isInt<8>(Imm); }]>;
+def i32immSExt8 : ImmLeaf<i32, [{ return isInt<8>(Imm); }]>;
+def i64immSExt8 : ImmLeaf<i64, [{ return isInt<8>(Imm); }]>;
+
+// If we have multiple users of an immediate, it's much smaller to reuse
+// the register, rather than encode the immediate in every instruction.
+// This has the risk of increasing register pressure from stretched live
+// ranges, however, the immediates should be trivial to rematerialize by
+// the RA in the event of high register pressure.
+// TODO : This is currently enabled for stores and binary ops. There are more
+// cases for which this can be enabled, though this catches the bulk of the
+// issues.
+// TODO2 : This should really also be enabled under O2, but there's currently
+// an issue with RA where we don't pull the constants into their users
+// when we rematerialize them. I'll follow-up on enabling O2 after we fix that
+// issue.
+// TODO3 : This is currently limited to single basic blocks (DAG creation
+// pulls block immediates to the top and merges them if necessary).
+// Eventually, it would be nice to allow ConstantHoisting to merge constants
+// globally for potentially added savings.
+//
+def imm8_su : PatLeaf<(i8 imm), [{
+ return !shouldAvoidImmediateInstFormsForSize(N);
+}]>;
+def imm16_su : PatLeaf<(i16 imm), [{
+ return !shouldAvoidImmediateInstFormsForSize(N);
+}]>;
+def imm32_su : PatLeaf<(i32 imm), [{
+ return !shouldAvoidImmediateInstFormsForSize(N);
+}]>;
+
+def i16immSExt8_su : PatLeaf<(i16immSExt8), [{
+ return !shouldAvoidImmediateInstFormsForSize(N);
+}]>;
+def i32immSExt8_su : PatLeaf<(i32immSExt8), [{
+ return !shouldAvoidImmediateInstFormsForSize(N);
+}]>;
+
+
+def i64immSExt32 : ImmLeaf<i64, [{ return isInt<32>(Imm); }]>;
// i64immZExt32 predicate - True if the 64-bit immediate fits in a 32-bit
// unsigned field.
-def i64immZExt32 : ImmLeaf<i64, [{ return (uint64_t)Imm == (uint32_t)Imm; }]>;
+def i64immZExt32 : ImmLeaf<i64, [{ return isUInt<32>(Imm); }]>;
def i64immZExt32SExt8 : ImmLeaf<i64, [{
- return (uint64_t)Imm == (uint32_t)Imm && (int32_t)Imm == (int8_t)Imm;
+ return isUInt<32>(Imm) && isInt<8>(static_cast<int32_t>(Imm));
}]>;
// Helper fragments for loads.
IIC_PUSH_REG>, OpSize32, Requires<[Not64BitMode]>;
def PUSH16rmr: I<0xFF, MRM6r, (outs), (ins GR16:$reg), "push{w}\t$reg",[],
IIC_PUSH_REG>, OpSize16;
-def PUSH16rmm: I<0xFF, MRM6m, (outs), (ins i16mem:$src), "push{w}\t$src",[],
- IIC_PUSH_MEM>, OpSize16;
def PUSH32rmr: I<0xFF, MRM6r, (outs), (ins GR32:$reg), "push{l}\t$reg",[],
IIC_PUSH_REG>, OpSize32, Requires<[Not64BitMode]>;
-def PUSH32rmm: I<0xFF, MRM6m, (outs), (ins i32mem:$src), "push{l}\t$src",[],
- IIC_PUSH_MEM>, OpSize32, Requires<[Not64BitMode]>;
def PUSH16i8 : Ii8<0x6a, RawFrm, (outs), (ins i16i8imm:$imm),
- "push{w}\t$imm", [], IIC_PUSH_IMM>, OpSize16,
- Requires<[Not64BitMode]>;
+ "push{w}\t$imm", [], IIC_PUSH_IMM>, OpSize16;
+def PUSHi16 : Ii16<0x68, RawFrm, (outs), (ins i16imm:$imm),
+ "push{w}\t$imm", [], IIC_PUSH_IMM>, OpSize16;
+
def PUSH32i8 : Ii8<0x6a, RawFrm, (outs), (ins i32i8imm:$imm),
"push{l}\t$imm", [], IIC_PUSH_IMM>, OpSize32,
Requires<[Not64BitMode]>;
-def PUSHi16 : Ii16<0x68, RawFrm, (outs), (ins i16imm:$imm),
- "push{w}\t$imm", [], IIC_PUSH_IMM>, OpSize16,
- Requires<[Not64BitMode]>;
def PUSHi32 : Ii32<0x68, RawFrm, (outs), (ins i32imm:$imm),
"push{l}\t$imm", [], IIC_PUSH_IMM>, OpSize32,
Requires<[Not64BitMode]>;
} // mayStore, SchedRW
+
+let mayLoad = 1, mayStore = 1, SchedRW = [WriteRMW] in {
+def PUSH16rmm: I<0xFF, MRM6m, (outs), (ins i16mem:$src), "push{w}\t$src",[],
+ IIC_PUSH_MEM>, OpSize16;
+def PUSH32rmm: I<0xFF, MRM6m, (outs), (ins i32mem:$src), "push{l}\t$src",[],
+ IIC_PUSH_MEM>, OpSize32, Requires<[Not64BitMode]>;
+} // mayLoad, mayStore, SchedRW
+
}
let Defs = [ESP, EFLAGS], Uses = [ESP], mayLoad = 1, hasSideEffects=0,
IIC_PUSH_REG>, OpSize32, Requires<[In64BitMode]>;
def PUSH64rmr: I<0xFF, MRM6r, (outs), (ins GR64:$reg), "push{q}\t$reg", [],
IIC_PUSH_REG>, OpSize32, Requires<[In64BitMode]>;
+} // mayStore, SchedRW
+let mayLoad = 1, mayStore = 1, SchedRW = [WriteRMW] in {
def PUSH64rmm: I<0xFF, MRM6m, (outs), (ins i64mem:$src), "push{q}\t$src", [],
IIC_PUSH_MEM>, OpSize32, Requires<[In64BitMode]>;
-} // mayStore, SchedRW
+} // mayLoad, mayStore, SchedRW
}
let Defs = [RSP], Uses = [RSP], hasSideEffects = 0, mayStore = 1,
SchedRW = [WriteStore] in {
def PUSH64i8 : Ii8<0x6a, RawFrm, (outs), (ins i64i8imm:$imm),
"push{q}\t$imm", [], IIC_PUSH_IMM>, Requires<[In64BitMode]>;
-def PUSH64i16 : Ii16<0x68, RawFrm, (outs), (ins i16imm:$imm),
- "push{w}\t$imm", [], IIC_PUSH_IMM>, OpSize16,
- Requires<[In64BitMode]>;
def PUSH64i32 : Ii32S<0x68, RawFrm, (outs), (ins i64i32imm:$imm),
"push{q}\t$imm", [], IIC_PUSH_IMM>, OpSize32,
Requires<[In64BitMode]>;
let SchedRW = [WriteStore] in {
def MOV8mi : Ii8 <0xC6, MRM0m, (outs), (ins i8mem :$dst, i8imm :$src),
"mov{b}\t{$src, $dst|$dst, $src}",
- [(store (i8 imm:$src), addr:$dst)], IIC_MOV_MEM>;
+ [(store (i8 imm8_su:$src), addr:$dst)], IIC_MOV_MEM>;
def MOV16mi : Ii16<0xC7, MRM0m, (outs), (ins i16mem:$dst, i16imm:$src),
"mov{w}\t{$src, $dst|$dst, $src}",
- [(store (i16 imm:$src), addr:$dst)], IIC_MOV_MEM>, OpSize16;
+ [(store (i16 imm16_su:$src), addr:$dst)], IIC_MOV_MEM>, OpSize16;
def MOV32mi : Ii32<0xC7, MRM0m, (outs), (ins i32mem:$dst, i32imm:$src),
"mov{l}\t{$src, $dst|$dst, $src}",
- [(store (i32 imm:$src), addr:$dst)], IIC_MOV_MEM>, OpSize32;
+ [(store (i32 imm32_su:$src), addr:$dst)], IIC_MOV_MEM>, OpSize32;
def MOV64mi32 : RIi32S<0xC7, MRM0m, (outs), (ins i64mem:$dst, i64i32imm:$src),
"mov{q}\t{$src, $dst|$dst, $src}",
[(store i64immSExt32:$src, addr:$dst)], IIC_MOV_MEM>;
def CountTrailingOnes : SDNodeXForm<imm, [{
// Count the trailing ones in the immediate.
- return getI8Imm(countTrailingOnes(N->getZExtValue()));
+ return getI8Imm(countTrailingOnes(N->getZExtValue()), SDLoc(N));
}]>;
def BZHIMask : ImmLeaf<i64, [{
include "X86InstrMMX.td"
include "X86Instr3DNow.td"
+// MPX instructions
+include "X86InstrMPX.td"
+
include "X86InstrVMX.td"
include "X86InstrSVM.td"
def : MnemonicAlias<"popa", "popal", "att">, Requires<[In32BitMode]>;
def : MnemonicAlias<"pusha", "pushal", "att">, Requires<[In32BitMode]>;
-def : MnemonicAlias<"repe", "rep", "att">;
-def : MnemonicAlias<"repz", "rep", "att">;
-def : MnemonicAlias<"repnz", "repne", "att">;
+def : MnemonicAlias<"repe", "rep">;
+def : MnemonicAlias<"repz", "rep">;
+def : MnemonicAlias<"repnz", "repne">;
def : MnemonicAlias<"ret", "retw", "att">, Requires<[In16BitMode]>;
def : MnemonicAlias<"ret", "retl", "att">, Requires<[In32BitMode]>;
def : MnemonicAlias<"ret", "retq", "att">, Requires<[In64BitMode]>;
+def : MnemonicAlias<"sal", "shl", "intel">;
def : MnemonicAlias<"salb", "shlb", "att">;
def : MnemonicAlias<"salw", "shlw", "att">;
def : MnemonicAlias<"sall", "shll", "att">;
def : MnemonicAlias<"xsaveq", "xsave64", "att">;
def : MnemonicAlias<"xrstorq", "xrstor64", "att">;
def : MnemonicAlias<"xsaveoptq", "xsaveopt64", "att">;
-
+def : MnemonicAlias<"xrstorsq", "xrstors64", "att">;
+def : MnemonicAlias<"xsavecq", "xsavec64", "att">;
+def : MnemonicAlias<"xsavesq", "xsaves64", "att">;
class CondCodeAlias<string Prefix,string Suffix, string OldCond, string NewCond,
string VariantName>
//===----------------------------------------------------------------------===//
// aad/aam default to base 10 if no operand is specified.
-def : InstAlias<"aad", (AAD8i8 10)>;
-def : InstAlias<"aam", (AAM8i8 10)>;
+def : InstAlias<"aad", (AAD8i8 10)>, Requires<[Not64BitMode]>;
+def : InstAlias<"aam", (AAM8i8 10)>, Requires<[Not64BitMode]>;
// Disambiguate the mem/imm form of bt-without-a-suffix as btl.
// Likewise for btc/btr/bts.
// "imul <imm>, B" is an alias for "imul <imm>, B, B".
-def : InstAlias<"imulw {$imm, $r|$r, $imm}", (IMUL16rri GR16:$r, GR16:$r, i16imm:$imm), 0>;
-def : InstAlias<"imulw {$imm, $r|$r, $imm}", (IMUL16rri8 GR16:$r, GR16:$r, i16i8imm:$imm), 0>;
-def : InstAlias<"imull {$imm, $r|$r, $imm}", (IMUL32rri GR32:$r, GR32:$r, i32imm:$imm), 0>;
-def : InstAlias<"imull {$imm, $r|$r, $imm}", (IMUL32rri8 GR32:$r, GR32:$r, i32i8imm:$imm), 0>;
-def : InstAlias<"imulq {$imm, $r|$r, $imm}", (IMUL64rri32 GR64:$r, GR64:$r, i64i32imm:$imm), 0>;
-def : InstAlias<"imulq {$imm, $r|$r, $imm}", (IMUL64rri8 GR64:$r, GR64:$r, i64i8imm:$imm), 0>;
+def : InstAlias<"imul{w} {$imm, $r|$r, $imm}", (IMUL16rri GR16:$r, GR16:$r, i16imm:$imm), 0>;
+def : InstAlias<"imul{w} {$imm, $r|$r, $imm}", (IMUL16rri8 GR16:$r, GR16:$r, i16i8imm:$imm), 0>;
+def : InstAlias<"imul{l} {$imm, $r|$r, $imm}", (IMUL32rri GR32:$r, GR32:$r, i32imm:$imm), 0>;
+def : InstAlias<"imul{l} {$imm, $r|$r, $imm}", (IMUL32rri8 GR32:$r, GR32:$r, i32i8imm:$imm), 0>;
+def : InstAlias<"imul{q} {$imm, $r|$r, $imm}", (IMUL64rri32 GR64:$r, GR64:$r, i64i32imm:$imm), 0>;
+def : InstAlias<"imul{q} {$imm, $r|$r, $imm}", (IMUL64rri8 GR64:$r, GR64:$r, i64i8imm:$imm), 0>;
// inb %dx -> inb %al, %dx
def : InstAlias<"inb\t{%dx|dx}", (IN8rr), 0>;
def : InstAlias<"inw\t{%dx|dx}", (IN16rr), 0>;
def : InstAlias<"inl\t{%dx|dx}", (IN32rr), 0>;
-def : InstAlias<"inb\t$port", (IN8ri i8imm:$port), 0>;
-def : InstAlias<"inw\t$port", (IN16ri i8imm:$port), 0>;
-def : InstAlias<"inl\t$port", (IN32ri i8imm:$port), 0>;
+def : InstAlias<"inb\t$port", (IN8ri u8imm:$port), 0>;
+def : InstAlias<"inw\t$port", (IN16ri u8imm:$port), 0>;
+def : InstAlias<"inl\t$port", (IN32ri u8imm:$port), 0>;
// jmp and call aliases for lcall and ljmp. jmp $42,$5 -> ljmp
def : InstAlias<"outb\t{%dx|dx}", (OUT8rr), 0>;
def : InstAlias<"outw\t{%dx|dx}", (OUT16rr), 0>;
def : InstAlias<"outl\t{%dx|dx}", (OUT32rr), 0>;
-def : InstAlias<"outb\t$port", (OUT8ir i8imm:$port), 0>;
-def : InstAlias<"outw\t$port", (OUT16ir i8imm:$port), 0>;
-def : InstAlias<"outl\t$port", (OUT32ir i8imm:$port), 0>;
+def : InstAlias<"outb\t$port", (OUT8ir u8imm:$port), 0>;
+def : InstAlias<"outw\t$port", (OUT16ir u8imm:$port), 0>;
+def : InstAlias<"outl\t$port", (OUT32ir u8imm:$port), 0>;
// 'sldt <mem>' can be encoded with either sldtw or sldtq with the same
// effect (both store to a 16-bit mem). Force to sldtw to avoid ambiguity
def : InstAlias<"xchg{l}\t{%eax, $src|$src, eax}",
(XCHG32ar64 GR32_NOAX:$src), 0>, Requires<[In64BitMode]>;
def : InstAlias<"xchg{q}\t{%rax, $src|$src, rax}", (XCHG64ar GR64:$src), 0>;
+
+// These aliases exist to get the parser to prioritize matching 8-bit
+// immediate encodings over matching the implicit ax/eax/rax encodings. By
+// explicitly mentioning the A register here, these entries will be ordered
+// first due to the more explicit immediate type.
+def : InstAlias<"adc{w}\t{$imm, %ax|ax, $imm}", (ADC16ri8 AX, i16i8imm:$imm), 0>;
+def : InstAlias<"add{w}\t{$imm, %ax|ax, $imm}", (ADD16ri8 AX, i16i8imm:$imm), 0>;
+def : InstAlias<"and{w}\t{$imm, %ax|ax, $imm}", (AND16ri8 AX, i16i8imm:$imm), 0>;
+def : InstAlias<"cmp{w}\t{$imm, %ax|ax, $imm}", (CMP16ri8 AX, i16i8imm:$imm), 0>;
+def : InstAlias<"or{w}\t{$imm, %ax|ax, $imm}", (OR16ri8 AX, i16i8imm:$imm), 0>;
+def : InstAlias<"sbb{w}\t{$imm, %ax|ax, $imm}", (SBB16ri8 AX, i16i8imm:$imm), 0>;
+def : InstAlias<"sub{w}\t{$imm, %ax|ax, $imm}", (SUB16ri8 AX, i16i8imm:$imm), 0>;
+def : InstAlias<"xor{w}\t{$imm, %ax|ax, $imm}", (XOR16ri8 AX, i16i8imm:$imm), 0>;
+
+def : InstAlias<"adc{l}\t{$imm, %eax|eax, $imm}", (ADC32ri8 EAX, i32i8imm:$imm), 0>;
+def : InstAlias<"add{l}\t{$imm, %eax|eax, $imm}", (ADD32ri8 EAX, i32i8imm:$imm), 0>;
+def : InstAlias<"and{l}\t{$imm, %eax|eax, $imm}", (AND32ri8 EAX, i32i8imm:$imm), 0>;
+def : InstAlias<"cmp{l}\t{$imm, %eax|eax, $imm}", (CMP32ri8 EAX, i32i8imm:$imm), 0>;
+def : InstAlias<"or{l}\t{$imm, %eax|eax, $imm}", (OR32ri8 EAX, i32i8imm:$imm), 0>;
+def : InstAlias<"sbb{l}\t{$imm, %eax|eax, $imm}", (SBB32ri8 EAX, i32i8imm:$imm), 0>;
+def : InstAlias<"sub{l}\t{$imm, %eax|eax, $imm}", (SUB32ri8 EAX, i32i8imm:$imm), 0>;
+def : InstAlias<"xor{l}\t{$imm, %eax|eax, $imm}", (XOR32ri8 EAX, i32i8imm:$imm), 0>;
+
+def : InstAlias<"adc{q}\t{$imm, %rax|rax, $imm}", (ADC64ri8 RAX, i64i8imm:$imm), 0>;
+def : InstAlias<"add{q}\t{$imm, %rax|rax, $imm}", (ADD64ri8 RAX, i64i8imm:$imm), 0>;
+def : InstAlias<"and{q}\t{$imm, %rax|rax, $imm}", (AND64ri8 RAX, i64i8imm:$imm), 0>;
+def : InstAlias<"cmp{q}\t{$imm, %rax|rax, $imm}", (CMP64ri8 RAX, i64i8imm:$imm), 0>;
+def : InstAlias<"or{q}\t{$imm, %rax|rax, $imm}", (OR64ri8 RAX, i64i8imm:$imm), 0>;
+def : InstAlias<"sbb{q}\t{$imm, %rax|rax, $imm}", (SBB64ri8 RAX, i64i8imm:$imm), 0>;
+def : InstAlias<"sub{q}\t{$imm, %rax|rax, $imm}", (SUB64ri8 RAX, i64i8imm:$imm), 0>;
+def : InstAlias<"xor{q}\t{$imm, %rax|rax, $imm}", (XOR64ri8 RAX, i64i8imm:$imm), 0>;