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emitxarch.h
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emitxarch.h
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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
#if defined(_TARGET_XARCH_)
/************************************************************************/
/* Public inline informational methods */
/************************************************************************/
public:
inline static bool isGeneralRegister (regNumber reg)
{ return (reg <= REG_INT_LAST); }
inline static bool isFloatReg (regNumber reg)
{ return (reg >= REG_FP_FIRST && reg <= REG_FP_LAST); }
inline static bool isDoubleReg (regNumber reg)
{ return isFloatReg(reg); }
/************************************************************************/
/* Routines that compute the size of / encode instructions */
/************************************************************************/
struct CnsVal
{
ssize_t cnsVal;
#ifdef RELOC_SUPPORT
bool cnsReloc;
#endif
};
UNATIVE_OFFSET emitInsSize (size_t code);
UNATIVE_OFFSET emitInsSizeRM (instruction ins);
UNATIVE_OFFSET emitInsSizeSV (size_t code, int var, int dsp);
UNATIVE_OFFSET emitInsSizeSV (instrDesc * id, int var, int dsp, int val);
UNATIVE_OFFSET emitInsSizeRR (instruction ins, regNumber reg1, regNumber reg2, emitAttr attr);
UNATIVE_OFFSET emitInsSizeAM (instrDesc * id, size_t code);
UNATIVE_OFFSET emitInsSizeAM (instrDesc * id, size_t code, int val);
UNATIVE_OFFSET emitInsSizeCV (instrDesc * id, size_t code);
UNATIVE_OFFSET emitInsSizeCV (instrDesc * id, size_t code, int val);
BYTE * emitOutputAM (BYTE *dst, instrDesc *id, size_t code,
CnsVal * addc = NULL);
BYTE * emitOutputSV (BYTE *dst, instrDesc *id, size_t code,
CnsVal * addc = NULL);
BYTE * emitOutputCV (BYTE *dst, instrDesc *id, size_t code,
CnsVal * addc = NULL);
BYTE * emitOutputR (BYTE *dst, instrDesc *id);
BYTE * emitOutputRI (BYTE *dst, instrDesc *id);
BYTE * emitOutputRR (BYTE *dst, instrDesc *id);
BYTE * emitOutputIV (BYTE *dst, instrDesc *id);
#ifdef FEATURE_AVX_SUPPORT
BYTE * emitOutputRRR(BYTE *dst, instrDesc *id);
#endif
BYTE * emitOutputLJ (BYTE *dst, instrDesc *id);
unsigned emitOutputRexOrVexPrefixIfNeeded(instruction ins, BYTE *dst, size_t &code);
unsigned emitGetRexPrefixSize(instruction ins);
unsigned emitGetVexPrefixSize(instruction ins, emitAttr attr);
unsigned emitGetPrefixSize(size_t code);
unsigned emitGetVexPrefixAdjustedSize(instruction ins, emitAttr attr, size_t code);
unsigned insEncodeReg345(instruction ins, regNumber reg, emitAttr size, size_t* code);
unsigned insEncodeReg012(instruction ins, regNumber reg, emitAttr size, size_t* code);
size_t insEncodeReg3456(instruction ins, regNumber reg, emitAttr size, size_t code);
unsigned insEncodeRegSIB(instruction ins, regNumber reg, size_t* code);
size_t insEncodeMRreg(instruction ins, size_t code);
size_t insEncodeMRreg(instruction ins, regNumber reg, emitAttr size, size_t code);
size_t insEncodeRRIb(instruction ins, regNumber reg, emitAttr size);
size_t insEncodeOpreg(instruction ins, regNumber reg, emitAttr size);
bool IsAVXInstruction(instruction ins);
size_t insEncodeMIreg(instruction ins, regNumber reg, emitAttr size, size_t code);
size_t AddRexWPrefix(instruction ins, size_t code);
size_t AddRexRPrefix(instruction ins, size_t code);
size_t AddRexXPrefix(instruction ins, size_t code);
size_t AddRexBPrefix(instruction ins, size_t code);
size_t AddRexPrefix(instruction ins, size_t code);
#ifdef FEATURE_AVX_SUPPORT
// 3-byte VEX prefix starts with byte 0xC4
#define VEX_PREFIX_MASK_3BYTE 0xC4000000000000LL
bool TakesVexPrefix(instruction ins);
// Returns true if the instruction encoding already contains VEX prefix
bool hasVexPrefix(size_t code)
{
return (code & VEX_PREFIX_MASK_3BYTE) != 0;
}
size_t AddVexPrefix(instruction ins, size_t code, emitAttr attr);
size_t AddVexPrefixIfNeeded(instruction ins, size_t code, emitAttr size)
{
if (TakesVexPrefix(ins))
{
code = AddVexPrefix(ins, code, size);
}
return code;
}
size_t AddVexPrefixIfNeededAndNotPresent(instruction ins, size_t code, emitAttr size)
{
if (TakesVexPrefix(ins) && !hasVexPrefix(code))
{
code = AddVexPrefix(ins, code, size);
}
return code;
}
bool useAVXEncodings;
bool UseAVX() { return useAVXEncodings; }
void SetUseAVX(bool value) { useAVXEncodings = value; }
bool IsThreeOperandBinaryAVXInstruction(instruction ins);
bool IsThreeOperandMoveAVXInstruction(instruction ins);
bool IsThreeOperandAVXInstruction(instruction ins)
{
return (IsThreeOperandBinaryAVXInstruction(ins) || IsThreeOperandMoveAVXInstruction(ins));
}
#else // !FEATURE_AVX_SUPPORT
bool UseAVX() { return false; }
bool hasVexPrefix(size_t code) { return false; }
bool IsThreeOperandBinaryAVXInstruction(instruction ins) { return false; }
bool IsThreeOperandMoveAVXInstruction(instruction ins) { return false; }
bool IsThreeOperandAVXInstruction(instruction ins) { return false; }
bool TakesVexPrefix(instruction ins) { return false; }
size_t AddVexPrefixIfNeeded(instruction ins, size_t code, emitAttr attr) { return code; }
size_t AddVexPrefixIfNeededAndNotPresent(instruction ins, size_t code, emitAttr size) { return code; }
#endif // !FEATURE_AVX_SUPPORT
/************************************************************************/
/* Debug-only routines to display instructions */
/************************************************************************/
#ifdef DEBUG
const char * emitFPregName (unsigned reg,
bool varName = true);
void emitDispReloc (ssize_t value);
void emitDispAddrMode(instrDesc *id, bool noDetail = false);
void emitDispShift (instruction ins, int cnt = 0);
void emitDispIns (instrDesc *id, bool isNew, bool doffs, bool asmfm,
unsigned offs = 0, BYTE * code = 0, size_t sz = 0,
insGroup *ig = NULL);
const char * emitXMMregName (unsigned reg);
const char * emitYMMregName (unsigned reg);
#endif
/************************************************************************/
/* Private members that deal with target-dependent instr. descriptors */
/************************************************************************/
private:
void emitSetAmdDisp (instrDescAmd* id, ssize_t dsp);
instrDesc *emitNewInstrAmd (emitAttr attr, ssize_t dsp);
instrDesc *emitNewInstrAmdCns (emitAttr attr, ssize_t dsp, int cns);
instrDesc *emitNewInstrCallDir (int argCnt,
VARSET_VALARG_TP GCvars,
regMaskTP gcrefRegs,
regMaskTP byrefRegs,
emitAttr retSize);
instrDesc *emitNewInstrCallInd( int argCnt,
ssize_t disp,
VARSET_VALARG_TP GCvars,
regMaskTP gcrefRegs,
regMaskTP byrefRegs,
emitAttr retSize);
void emitGetInsCns (instrDesc *id, CnsVal *cv);
ssize_t emitGetInsAmdCns(instrDesc *id, CnsVal *cv);
void emitGetInsDcmCns(instrDesc *id, CnsVal *cv);
ssize_t emitGetInsAmdAny(instrDesc *id);
/************************************************************************/
/* Private helpers for instruction output */
/************************************************************************/
private:
insFormat emitInsModeFormat(instruction ins, insFormat base,
insFormat FPld,
insFormat FPst);
bool emitVerifyEncodable(instruction ins,
emitAttr size,
regNumber reg1,
regNumber reg2 = REG_NA);
bool emitInsCanOnlyWriteSSE2OrAVXReg(instrDesc *id);
/*****************************************************************************
*
* Convert between an index scale in bytes to a smaller encoding used for
* storage in instruction descriptors.
*/
inline emitter::opSize emitEncodeScale(size_t scale)
{
assert(scale == 1 || scale == 2 || scale == 4 || scale == 8);
return emitSizeEncode[scale-1];
}
inline emitAttr emitDecodeScale(unsigned ensz)
{
assert(ensz < 4);
return emitter::emitSizeDecode[ensz];
}
/************************************************************************/
/* The public entry points to output instructions */
/************************************************************************/
public:
void emitLoopAlign ();
void emitIns (instruction ins);
void emitIns (instruction ins, emitAttr attr);
void emitInsRMW (instruction inst, emitAttr attr, GenTreePtr dst, GenTreePtr src);
void emitInsRMW (instruction inst, emitAttr attr, GenTreePtr dst);
void emitIns_Nop (unsigned size);
void emitIns_I (instruction ins,
emitAttr attr,
int val);
void emitIns_R (instruction ins,
emitAttr attr,
regNumber reg);
void emitIns_C (instruction ins,
emitAttr attr,
CORINFO_FIELD_HANDLE fdlHnd,
int offs);
void emitIns_R_I (instruction ins,
emitAttr attr,
regNumber reg,
ssize_t val);
void emitIns_R_R (instruction ins,
emitAttr attr,
regNumber reg1,
regNumber reg2);
void emitIns_R_R_I (instruction ins,
emitAttr attr,
regNumber reg1,
regNumber reg2,
int ival);
#ifdef FEATURE_AVX_SUPPORT
void emitIns_R_R_R (instruction ins,
emitAttr attr,
regNumber reg1,
regNumber reg2,
regNumber reg3);
#endif
void emitIns_S (instruction ins,
emitAttr attr,
int varx,
int offs);
void emitIns_S_R (instruction ins,
emitAttr attr,
regNumber ireg,
int varx,
int offs);
void emitIns_R_S (instruction ins,
emitAttr attr,
regNumber ireg,
int varx,
int offs);
void emitIns_S_I (instruction ins,
emitAttr attr,
int varx,
int offs,
int val);
void emitIns_R_C (instruction ins,
emitAttr attr,
regNumber reg,
CORINFO_FIELD_HANDLE fldHnd,
int offs);
void emitIns_C_R (instruction ins,
emitAttr attr,
CORINFO_FIELD_HANDLE fldHnd,
regNumber reg,
int offs);
void emitIns_C_I (instruction ins,
emitAttr attr,
CORINFO_FIELD_HANDLE fdlHnd,
int offs,
int val);
void emitIns_IJ (emitAttr attr,
regNumber reg,
unsigned base);
void emitIns_J_S (instruction ins,
emitAttr attr,
BasicBlock *dst,
int varx,
int offs);
void emitIns_R_L (instruction ins,
emitAttr attr,
BasicBlock * dst,
regNumber reg);
void emitIns_R_D (instruction ins,
emitAttr attr,
unsigned offs,
regNumber reg);
void emitIns_I_AR (instruction ins,
emitAttr attr,
int val,
regNumber reg,
int offs,
int memCookie = 0,
void * clsCookie = NULL);
void emitIns_I_AI (instruction ins,
emitAttr attr,
int val,
ssize_t disp);
void emitIns_R_AR (instruction ins,
emitAttr attr,
regNumber ireg,
regNumber reg,
int offs,
int memCookie = 0,
void * clsCookie = NULL);
void emitIns_R_AI (instruction ins,
emitAttr attr,
regNumber ireg,
ssize_t disp);
void emitIns_AR_R (instruction ins,
emitAttr attr,
regNumber ireg,
regNumber reg,
int offs,
int memCookie = 0,
void * clsCookie = NULL);
void emitIns_AI_R (instruction ins,
emitAttr attr,
regNumber ireg,
ssize_t disp);
void emitIns_I_ARR (instruction ins,
emitAttr attr,
int val,
regNumber reg,
regNumber rg2,
int disp);
void emitIns_R_ARR (instruction ins,
emitAttr attr,
regNumber ireg,
regNumber reg,
regNumber rg2,
int disp);
void emitIns_ARR_R (instruction ins,
emitAttr attr,
regNumber ireg,
regNumber reg,
regNumber rg2,
int disp);
void emitIns_I_ARX (instruction ins,
emitAttr attr,
int val,
regNumber reg,
regNumber rg2,
unsigned mul,
int disp);
void emitIns_R_ARX (instruction ins,
emitAttr attr,
regNumber ireg,
regNumber reg,
regNumber rg2,
unsigned mul,
int disp);
void emitIns_ARX_R (instruction ins,
emitAttr attr,
regNumber ireg,
regNumber reg,
regNumber rg2,
unsigned mul,
int disp);
void emitIns_I_AX (instruction ins,
emitAttr attr,
int val,
regNumber reg,
unsigned mul,
int disp);
void emitIns_R_AX (instruction ins,
emitAttr attr,
regNumber ireg,
regNumber reg,
unsigned mul,
int disp);
void emitIns_AX_R (instruction ins,
emitAttr attr,
regNumber ireg,
regNumber reg,
unsigned mul,
int disp);
#if FEATURE_STACK_FP_X87
void emitIns_F_F0 (instruction ins,
unsigned fpreg);
void emitIns_F0_F (instruction ins,
unsigned fpreg);
#endif // FEATURE_STACK_FP_X87
enum EmitCallType
{
EC_FUNC_TOKEN, // Direct call to a helper/static/nonvirtual/global method
EC_FUNC_TOKEN_INDIR, // Indirect call to a helper/static/nonvirtual/global method
EC_FUNC_ADDR, // Direct call to an absolute address
EC_FUNC_VIRTUAL, // Call to a virtual method (using the vtable)
EC_INDIR_R, // Indirect call via register
EC_INDIR_SR, // Indirect call via stack-reference (local var)
EC_INDIR_C, // Indirect call via static class var
EC_INDIR_ARD, // Indirect call via an addressing mode
EC_COUNT
};
void emitIns_Call (EmitCallType callType,
CORINFO_METHOD_HANDLE methHnd,
CORINFO_SIG_INFO* sigInfo, // used to report call sites to the EE
void* addr,
ssize_t argSize,
emitAttr retSize,
VARSET_VALARG_TP ptrVars,
regMaskTP gcrefRegs,
regMaskTP byrefRegs,
GenTreeIndir * indir,
bool isJump = false,
bool isNoGC = false);
void emitIns_Call (EmitCallType callType,
CORINFO_METHOD_HANDLE methHnd,
INDEBUG_LDISASM_COMMA(CORINFO_SIG_INFO* sigInfo) // used to report call sites to the EE
void* addr,
ssize_t argSize,
emitAttr retSize,
VARSET_VALARG_TP ptrVars,
regMaskTP gcrefRegs,
regMaskTP byrefRegs,
IL_OFFSETX ilOffset = BAD_IL_OFFSET,
regNumber ireg = REG_NA,
regNumber xreg = REG_NA,
unsigned xmul = 0,
ssize_t disp = 0,
bool isJump = false,
bool isNoGC = false);
void AdjustDisp32ForRipRelative(instrDesc *id, BYTE ** pDisp, const BYTE * addrOfNextInstr);
#ifdef _TARGET_AMD64_
// Is the last instruction emitted a call instruction?
bool emitIsLastInsCall();
// Insert a NOP at the end of the the current instruction group if the last emitted instruction was a 'call',
// because the next instruction group will be an epilog.
void emitOutputPreEpilogNOP();
#endif // _TARGET_AMD64_
/*****************************************************************************
*
* Given a jump, return true if it's a conditional jump.
*/
inline bool emitIsCondJump(instrDesc *jmp)
{
instruction ins = jmp->idIns();
assert(jmp->idInsFmt() == IF_LABEL);
return (ins != INS_call && ins != INS_jmp);
}
/*****************************************************************************
*
* Given a jump, return true if it's an unconditional jump.
*/
inline bool emitIsUncondJump(instrDesc *jmp)
{
instruction ins = jmp->idIns();
assert(jmp->idInsFmt() == IF_LABEL);
return (ins == INS_jmp);
}
#endif // _TARGET_XARCH_