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Recommit r201059 and r201060 with hopefully a fix for its original failure.

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Original commits messages:

Add MRMXr/MRMXm form to X86 for use by instructions which treat the 'reg' field of modrm byte as a don't care value. Will allow for simplification of disassembler code.

Simplify a bunch of code by removing the need for the x86 disassembler table builder to know about extended opcodes. The modrm forms are sufficient to convey the information.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201065 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2014-02-10 06:55:41 +00:00
parent 70ff3e91f7
commit ced2756280
9 changed files with 76 additions and 311 deletions
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6
lib/Target/X86/MCTargetDesc/X86BaseInfo.h
View File

@ -272,6 +272,10 @@ namespace X86II {
/// destination index register DI/ESI/RDI.
RawFrmDstSrc = 10,
/// MRMX[rm] - The forms are used to represent instructions that use a
/// Mod/RM byte, and don't use the middle field for anything.
MRMXr = 14, MRMXm = 15,
/// MRM[0-7][rm] - These forms are used to represent instructions that use
/// a Mod/RM byte, and use the middle field to hold extended opcode
/// information. In the intel manual these are represented as /0, /1, ...
@ -674,11 +678,13 @@ namespace X86II {
// Opcode == X86::LEA16r || Opcode == X86::LEA32r)
return FirstMemOp;
}
case X86II::MRMXr:
case X86II::MRM0r: case X86II::MRM1r:
case X86II::MRM2r: case X86II::MRM3r:
case X86II::MRM4r: case X86II::MRM5r:
case X86II::MRM6r: case X86II::MRM7r:
return -1;
case X86II::MRMXm:
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:

16
lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
View File

@ -1056,6 +1056,7 @@ static unsigned DetermineREXPrefix(const MCInst &MI, uint64_t TSFlags,
}
break;
}
case X86II::MRMXm:
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
@ -1426,28 +1427,35 @@ EncodeInstruction(const MCInst &MI, raw_ostream &OS,
break;
}
case X86II::MRMXr:
case X86II::MRM0r: case X86II::MRM1r:
case X86II::MRM2r: case X86II::MRM3r:
case X86II::MRM4r: case X86II::MRM5r:
case X86II::MRM6r: case X86II::MRM7r:
case X86II::MRM6r: case X86II::MRM7r: {
if (HasVEX_4V) // Skip the register dst (which is encoded in VEX_VVVV).
++CurOp;
EmitByte(BaseOpcode, CurByte, OS);
uint64_t Form = TSFlags & X86II::FormMask;
EmitRegModRMByte(MI.getOperand(CurOp++),
(TSFlags & X86II::FormMask)-X86II::MRM0r,
(Form == X86II::MRMXr) ? 0 : Form-X86II::MRM0r,
CurByte, OS);
break;
}
case X86II::MRMXm:
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
case X86II::MRM6m: case X86II::MRM7m:
case X86II::MRM6m: case X86II::MRM7m: {
if (HasVEX_4V) // Skip the register dst (which is encoded in VEX_VVVV).
++CurOp;
EmitByte(BaseOpcode, CurByte, OS);
EmitMemModRMByte(MI, CurOp, (TSFlags & X86II::FormMask)-X86II::MRM0m,
uint64_t Form = TSFlags & X86II::FormMask;
EmitMemModRMByte(MI, CurOp, (Form == X86II::MRMXm) ? 0 : Form-X86II::MRM0m,
TSFlags, CurByte, OS, Fixups, STI);
CurOp += X86::AddrNumOperands;
break;
}
case X86II::MRM_C1: case X86II::MRM_C2: case X86II::MRM_C3:
case X86II::MRM_C4: case X86II::MRM_C8: case X86II::MRM_C9:
case X86II::MRM_CA: case X86II::MRM_CB: case X86II::MRM_D0:

9
lib/Target/X86/X86CodeEmitter.cpp
View File

@ -212,6 +212,7 @@ static unsigned determineREX(const MachineInstr &MI) {
}
break;
}
case X86II::MRMXm:
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
@ -1295,6 +1296,7 @@ void Emitter<CodeEmitter>::emitInstruction(MachineInstr &MI,
break;
}
case X86II::MRMXr:
case X86II::MRM0r: case X86II::MRM1r:
case X86II::MRM2r: case X86II::MRM3r:
case X86II::MRM4r: case X86II::MRM5r:
@ -1302,8 +1304,9 @@ void Emitter<CodeEmitter>::emitInstruction(MachineInstr &MI,
if (HasVEX_4V) // Skip the register dst (which is encoded in VEX_VVVV).
++CurOp;
MCE.emitByte(BaseOpcode);
uint64_t Form = (Desc->TSFlags & X86II::FormMask);
emitRegModRMByte(MI.getOperand(CurOp++).getReg(),
(Desc->TSFlags & X86II::FormMask)-X86II::MRM0r);
(Form == X86II::MRMXr) ? 0 : Form-X86II::MRM0r);
if (CurOp == NumOps)
break;
@ -1332,6 +1335,7 @@ void Emitter<CodeEmitter>::emitInstruction(MachineInstr &MI,
break;
}
case X86II::MRMXm:
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
@ -1343,7 +1347,8 @@ void Emitter<CodeEmitter>::emitInstruction(MachineInstr &MI,
X86II::getSizeOfImm(Desc->TSFlags) : 4) : 0;
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, CurOp, (Desc->TSFlags & X86II::FormMask)-X86II::MRM0m,
uint64_t Form = (Desc->TSFlags & X86II::FormMask);
emitMemModRMByte(MI, CurOp, (Form==X86II::MRMXm) ? 0 : Form - X86II::MRM0m,
PCAdj);
CurOp += X86::AddrNumOperands;

4
lib/Target/X86/X86InstrCMovSetCC.td
View File

@ -82,11 +82,11 @@ defm CMOVG : CMOV<0x4F, "cmovg" , X86_COND_G>;
// SetCC instructions.
multiclass SETCC<bits<8> opc, string Mnemonic, PatLeaf OpNode> {
let Uses = [EFLAGS] in {
def r : I<opc, MRM0r, (outs GR8:$dst), (ins),
def r : I<opc, MRMXr, (outs GR8:$dst), (ins),
!strconcat(Mnemonic, "\t$dst"),
[(set GR8:$dst, (X86setcc OpNode, EFLAGS))],
IIC_SET_R>, TB, Sched<[WriteALU]>;
def m : I<opc, MRM0m, (outs), (ins i8mem:$dst),
def m : I<opc, MRMXm, (outs), (ins i8mem:$dst),
!strconcat(Mnemonic, "\t$dst"),
[(store (X86setcc OpNode, EFLAGS), addr:$dst)],
IIC_SET_M>, TB, Sched<[WriteALU, WriteStore]>;

1
lib/Target/X86/X86InstrFormats.td
View File

@ -24,6 +24,7 @@ def MRMDestMem : Format<4>; def MRMSrcReg : Format<5>;
def MRMSrcMem : Format<6>; def RawFrmMemOffs : Format<7>;
def RawFrmSrc : Format<8>; def RawFrmDst : Format<9>;
def RawFrmDstSrc: Format<10>;
def MRMXr : Format<14>; def MRMXm : Format<15>;
def MRM0r : Format<16>; def MRM1r : Format<17>; def MRM2r : Format<18>;
def MRM3r : Format<19>; def MRM4r : Format<20>; def MRM5r : Format<21>;
def MRM6r : Format<22>; def MRM7r : Format<23>;

4
lib/Target/X86/X86InstrInfo.td
View File

@ -928,9 +928,9 @@ def trunc_su : PatFrag<(ops node:$src), (trunc node:$src), [{
// Nop
let neverHasSideEffects = 1, SchedRW = [WriteZero] in {
def NOOP : I<0x90, RawFrm, (outs), (ins), "nop", [], IIC_NOP>;
def NOOPW : I<0x1f, MRM0m, (outs), (ins i16mem:$zero),
def NOOPW : I<0x1f, MRMXm, (outs), (ins i16mem:$zero),
"nop{w}\t$zero", [], IIC_NOP>, TB, OpSize16;
def NOOPL : I<0x1f, MRM0m, (outs), (ins i32mem:$zero),
def NOOPL : I<0x1f, MRMXm, (outs), (ins i32mem:$zero),
"nop{l}\t$zero", [], IIC_NOP>, TB, OpSize32;
}

2
lib/Target/X86/X86InstrSSE.td
View File

@ -7677,7 +7677,7 @@ defm : pclmul_alias<"lqlq", 0x00>;
let Predicates = [HasSSE4A] in {
let Constraints = "$src = $dst" in {
def EXTRQI : Ii8<0x78, MRM0r, (outs VR128:$dst),
def EXTRQI : Ii8<0x78, MRMXr, (outs VR128:$dst),
(ins VR128:$src, i8imm:$len, i8imm:$idx),
"extrq\t{$idx, $len, $src|$src, $len, $idx}",
[(set VR128:$dst, (int_x86_sse4a_extrqi VR128:$src, imm:$len,

4
test/MC/X86/x86-64.s
View File

@ -1388,3 +1388,7 @@ movq %xmm0, %rax
vmovd %xmm0, %eax
vmovd %xmm0, %rax
vmovq %xmm0, %rax
// CHECK: seto 3735928559(%r10,%r9,8)
// CHECK: encoding: [0x43,0x0f,0x90,0x84,0xca,0xef,0xbe,0xad,0xde]
seto 0xdeadbeef(%r10,%r9,8)

341
utils/TableGen/X86RecognizableInstr.cpp
View File

@ -63,6 +63,7 @@ namespace X86Local {
RawFrmSrc = 8,
RawFrmDst = 9,
RawFrmDstSrc = 10,
MRMXr = 14, MRMXm = 15,
MRM0r = 16, MRM1r = 17, MRM2r = 18, MRM3r = 19,
MRM4r = 20, MRM5r = 21, MRM6r = 22, MRM7r = 23,
MRM0m = 24, MRM1m = 25, MRM2m = 26, MRM3m = 27,
@ -95,80 +96,8 @@ namespace X86Local {
};
}
// If rows are added to the opcode extension tables, then corresponding entries
// must be added here.
//
// If the row corresponds to a single byte (i.e., 8f), then add an entry for
// that byte to ONE_BYTE_EXTENSION_TABLES.
//
// If the row corresponds to two bytes where the first is 0f, add an entry for
// the second byte to TWO_BYTE_EXTENSION_TABLES.
//
// If the row corresponds to some other set of bytes, you will need to modify
// the code in RecognizableInstr::emitDecodePath() as well, and add new prefixes
// to the X86 TD files, except in two cases: if the first two bytes of such a
// new combination are 0f 38 or 0f 3a, you just have to add maps called
// THREE_BYTE_38_EXTENSION_TABLES and THREE_BYTE_3A_EXTENSION_TABLES and add a
// switch(Opcode) just below the case X86Local::T8: or case X86Local::TA: line
// in RecognizableInstr::emitDecodePath().
#define ONE_BYTE_EXTENSION_TABLES \
EXTENSION_TABLE(80) \
EXTENSION_TABLE(81) \
EXTENSION_TABLE(82) \
EXTENSION_TABLE(83) \
EXTENSION_TABLE(8f) \
EXTENSION_TABLE(c0) \
EXTENSION_TABLE(c1) \
EXTENSION_TABLE(c6) \
EXTENSION_TABLE(c7) \
EXTENSION_TABLE(d0) \
EXTENSION_TABLE(d1) \
EXTENSION_TABLE(d2) \
EXTENSION_TABLE(d3) \
EXTENSION_TABLE(f6) \
EXTENSION_TABLE(f7) \
EXTENSION_TABLE(fe) \
EXTENSION_TABLE(ff)
#define TWO_BYTE_EXTENSION_TABLES \
EXTENSION_TABLE(00) \
EXTENSION_TABLE(01) \
EXTENSION_TABLE(0d) \
EXTENSION_TABLE(18) \
EXTENSION_TABLE(71) \
EXTENSION_TABLE(72) \
EXTENSION_TABLE(73) \
EXTENSION_TABLE(ae) \
EXTENSION_TABLE(ba) \
EXTENSION_TABLE(c7)
#define THREE_BYTE_38_EXTENSION_TABLES \
EXTENSION_TABLE(F3)
#define XOP9_MAP_EXTENSION_TABLES \
EXTENSION_TABLE(01) \
EXTENSION_TABLE(02)
using namespace X86Disassembler;
/// needsModRMForDecode - Indicates whether a particular instruction requires a
/// ModR/M byte for the instruction to be properly decoded. For example, a
/// MRMDestReg instruction needs the Mod field in the ModR/M byte to be set to
/// 0b11.
///
/// @param form - The form of the instruction.
/// @return - true if the form implies that a ModR/M byte is required, false
/// otherwise.
static bool needsModRMForDecode(uint8_t form) {
return (form == X86Local::MRMDestReg ||
form == X86Local::MRMDestMem ||
form == X86Local::MRMSrcReg ||
form == X86Local::MRMSrcMem ||
(form >= X86Local::MRM0r && form <= X86Local::MRM7r) ||
(form >= X86Local::MRM0m && form <= X86Local::MRM7m));
}
/// isRegFormat - Indicates whether a particular form requires the Mod field of
/// the ModR/M byte to be 0b11.
///
@ -178,6 +107,7 @@ static bool needsModRMForDecode(uint8_t form) {
static bool isRegFormat(uint8_t form) {
return (form == X86Local::MRMDestReg ||
form == X86Local::MRMSrcReg ||
form == X86Local::MRMXr ||
(form >= X86Local::MRM0r && form <= X86Local::MRM7r));
}
@ -741,6 +671,7 @@ void RecognizableInstr::emitInstructionSpecifier() {
HANDLE_OPTIONAL(immediate)
HANDLE_OPTIONAL(immediate) // above might be a register in 7:4
break;
case X86Local::MRMXr:
case X86Local::MRM0r:
case X86Local::MRM1r:
case X86Local::MRM2r:
@ -767,6 +698,7 @@ void RecognizableInstr::emitInstructionSpecifier() {
HANDLE_OPTIONAL(relocation)
HANDLE_OPTIONAL(immediate)
break;
case X86Local::MRMXm:
case X86Local::MRM0m:
case X86Local::MRM1m:
case X86Local::MRM2m:
@ -863,169 +795,52 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
switch (OpMap) {
default: llvm_unreachable("Invalid map!");
// Extended two-byte opcodes can start with 66 0f, f2 0f, f3 0f, or 0f
case X86Local::OB:
case X86Local::TB:
opcodeType = TWOBYTE;
switch (Opcode) {
default:
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
filter = new DumbFilter();
break;
#define EXTENSION_TABLE(n) case 0x##n:
TWO_BYTE_EXTENSION_TABLES
#undef EXTENSION_TABLE
switch (Form) {
default:
llvm_unreachable("Unhandled two-byte extended opcode");
case X86Local::MRM0r:
case X86Local::MRM1r:
case X86Local::MRM2r:
case X86Local::MRM3r:
case X86Local::MRM4r:
case X86Local::MRM5r:
case X86Local::MRM6r:
case X86Local::MRM7r:
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
break;
case X86Local::MRM0m:
case X86Local::MRM1m:
case X86Local::MRM2m:
case X86Local::MRM3m:
case X86Local::MRM4m:
case X86Local::MRM5m:
case X86Local::MRM6m:
case X86Local::MRM7m:
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
break;
MRM_MAPPING
} // switch (Form)
break;
} // switch (Opcode)
opcodeToSet = Opcode;
break;
case X86Local::T8:
opcodeType = THREEBYTE_38;
switch (Opcode) {
default:
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
filter = new DumbFilter();
break;
#define EXTENSION_TABLE(n) case 0x##n:
THREE_BYTE_38_EXTENSION_TABLES
#undef EXTENSION_TABLE
switch (Form) {
default:
llvm_unreachable("Unhandled two-byte extended opcode");
case X86Local::MRM0r:
case X86Local::MRM1r:
case X86Local::MRM2r:
case X86Local::MRM3r:
case X86Local::MRM4r:
case X86Local::MRM5r:
case X86Local::MRM6r:
case X86Local::MRM7r:
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
break;
case X86Local::MRM0m:
case X86Local::MRM1m:
case X86Local::MRM2m:
case X86Local::MRM3m:
case X86Local::MRM4m:
case X86Local::MRM5m:
case X86Local::MRM6m:
case X86Local::MRM7m:
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
break;
MRM_MAPPING
} // switch (Form)
break;
} // switch (Opcode)
opcodeToSet = Opcode;
break;
case X86Local::TA:
opcodeType = THREEBYTE_3A;
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
filter = new DumbFilter();
opcodeToSet = Opcode;
break;
case X86Local::A6:
opcodeType = THREEBYTE_A6;
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
filter = new DumbFilter();
opcodeToSet = Opcode;
break;
case X86Local::A7:
opcodeType = THREEBYTE_A7;
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
filter = new DumbFilter();
opcodeToSet = Opcode;
break;
case X86Local::XOP8:
opcodeType = XOP8_MAP;
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
filter = new DumbFilter();
opcodeToSet = Opcode;
break;
case X86Local::XOP9:
opcodeType = XOP9_MAP;
switch (Opcode) {
default:
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
filter = new DumbFilter();
break;
#define EXTENSION_TABLE(n) case 0x##n:
XOP9_MAP_EXTENSION_TABLES
#undef EXTENSION_TABLE
switch (Form) {
default:
llvm_unreachable("Unhandled XOP9 extended opcode");
case X86Local::MRM0r:
case X86Local::MRM1r:
case X86Local::MRM2r:
case X86Local::MRM3r:
case X86Local::MRM4r:
case X86Local::MRM5r:
case X86Local::MRM6r:
case X86Local::MRM7r:
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
break;
case X86Local::MRM0m:
case X86Local::MRM1m:
case X86Local::MRM2m:
case X86Local::MRM3m:
case X86Local::MRM4m:
case X86Local::MRM5m:
case X86Local::MRM6m:
case X86Local::MRM7m:
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
break;
MRM_MAPPING
} // switch (Form)
break;
} // switch (Opcode)
opcodeToSet = Opcode;
break;
case X86Local::XOPA:
opcodeType = XOPA_MAP;
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
switch (OpMap) {
default: llvm_unreachable("Unexpected map!");
case X86Local::OB: opcodeType = ONEBYTE; break;
case X86Local::TB: opcodeType = TWOBYTE; break;
case X86Local::T8: opcodeType = THREEBYTE_38; break;
case X86Local::TA: opcodeType = THREEBYTE_3A; break;
case X86Local::A6: opcodeType = THREEBYTE_A6; break;
case X86Local::A7: opcodeType = THREEBYTE_A7; break;
case X86Local::XOP8: opcodeType = XOP8_MAP; break;
case X86Local::XOP9: opcodeType = XOP9_MAP; break;
case X86Local::XOPA: opcodeType = XOPA_MAP; break;
}
switch (Form) {
default:
filter = new DumbFilter();
break;
case X86Local::MRMDestReg: case X86Local::MRMDestMem:
case X86Local::MRMSrcReg: case X86Local::MRMSrcMem:
case X86Local::MRMXr: case X86Local::MRMXm:
filter = new ModFilter(isRegFormat(Form));
break;
case X86Local::MRM0r: case X86Local::MRM1r:
case X86Local::MRM2r: case X86Local::MRM3r:
case X86Local::MRM4r: case X86Local::MRM5r:
case X86Local::MRM6r: case X86Local::MRM7r:
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
break;
case X86Local::MRM0m: case X86Local::MRM1m:
case X86Local::MRM2m: case X86Local::MRM3m:
case X86Local::MRM4m: case X86Local::MRM5m:
case X86Local::MRM6m: case X86Local::MRM7m:
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
break;
MRM_MAPPING
} // switch (Form)
opcodeToSet = Opcode;
break;
case X86Local::D8:
@ -1042,80 +857,6 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
filter = new ExactFilter(Opcode);
opcodeToSet = 0xd8 + (OpMap - X86Local::D8);
break;
case X86Local::OB:
opcodeType = ONEBYTE;
switch (Opcode) {
#define EXTENSION_TABLE(n) case 0x##n:
ONE_BYTE_EXTENSION_TABLES
#undef EXTENSION_TABLE
switch (Form) {
default:
llvm_unreachable("Fell through the cracks of a single-byte "
"extended opcode");
case X86Local::MRM0r:
case X86Local::MRM1r:
case X86Local::MRM2r:
case X86Local::MRM3r:
case X86Local::MRM4r:
case X86Local::MRM5r:
case X86Local::MRM6r:
case X86Local::MRM7r:
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
break;
case X86Local::MRM0m:
case X86Local::MRM1m:
case X86Local::MRM2m:
case X86Local::MRM3m:
case X86Local::MRM4m:
case X86Local::MRM5m:
case X86Local::MRM6m:
case X86Local::MRM7m:
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
break;
MRM_MAPPING
} // switch (Form)
break;
case 0xd8:
case 0xd9:
case 0xda:
case 0xdb:
case 0xdc:
case 0xdd:
case 0xde:
case 0xdf:
switch (Form) {
default:
llvm_unreachable("Unhandled escape opcode form");
case X86Local::MRM0r:
case X86Local::MRM1r:
case X86Local::MRM2r:
case X86Local::MRM3r:
case X86Local::MRM4r:
case X86Local::MRM5r:
case X86Local::MRM6r:
case X86Local::MRM7r:
filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
break;
case X86Local::MRM0m:
case X86Local::MRM1m:
case X86Local::MRM2m:
case X86Local::MRM3m:
case X86Local::MRM4m:
case X86Local::MRM5m:
case X86Local::MRM6m:
case X86Local::MRM7m:
filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
break;
} // switch (Form)
break;
default:
if (needsModRMForDecode(Form))
filter = new ModFilter(isRegFormat(Form));
else
filter = new DumbFilter();
break;
} // switch (Opcode)
opcodeToSet = Opcode;
} // switch (OpMap)
assert(opcodeType != (OpcodeType)-1 &&