llvm-project/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h

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//===-- AMDGPUBaseInfo.h - Top level definitions for AMDGPU -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AMDGPU_UTILS_AMDGPUBASEINFO_H
#define LLVM_LIB_TARGET_AMDGPU_UTILS_AMDGPUBASEINFO_H
#include "AMDKernelCodeT.h"
#include "llvm/IR/CallingConv.h"
#define GET_INSTRINFO_OPERAND_ENUM
#include "AMDGPUGenInstrInfo.inc"
#undef GET_INSTRINFO_OPERAND_ENUM
namespace llvm {
class FeatureBitset;
class Function;
class GlobalValue;
class MCContext;
AMDGPU] Assembler: better support for immediate literals in assembler. Summary: Prevously assembler parsed all literals as either 32-bit integers or 32-bit floating-point values. Because of this we couldn't support f64 literals. E.g. in instruction "v_fract_f64 v[0:1], 0.5", literal 0.5 was encoded as 32-bit literal 0x3f000000, which is incorrect and will be interpreted as 3.0517578125E-5 instead of 0.5. Correct encoding is inline constant 240 (optimal) or 32-bit literal 0x3FE00000 at least. With this change the way immediate literals are parsed is changed. All literals are always parsed as 64-bit values either integer or floating-point. Then we convert parsed literals to correct form based on information about type of operand parsed (was literal floating or binary) and type of expected instruction operands (is this f32/64 or b32/64 instruction). Here are rules how we convert literals: - We parsed fp literal: - Instruction expects 64-bit operand: - If parsed literal is inlinable (e.g. v_fract_f64_e32 v[0:1], 0.5) - then we do nothing this literal - Else if literal is not-inlinable but instruction requires to inline it (e.g. this is e64 encoding, v_fract_f64_e64 v[0:1], 1.5) - report error - Else literal is not-inlinable but we can encode it as additional 32-bit literal constant - If instruction expect fp operand type (f64) - Check if low 32 bits of literal are zeroes (e.g. v_fract_f64 v[0:1], 1.5) - If so then do nothing - Else (e.g. v_fract_f64 v[0:1], 3.1415) - report warning that low 32 bits will be set to zeroes and precision will be lost - set low 32 bits of literal to zeroes - Instruction expects integer operand type (e.g. s_mov_b64_e32 s[0:1], 1.5) - report error as it is unclear how to encode this literal - Instruction expects 32-bit operand: - Convert parsed 64 bit fp literal to 32 bit fp. Allow lose of precision but not overflow or underflow - Is this literal inlinable and are we required to inline literal (e.g. v_trunc_f32_e64 v0, 0.5) - do nothing - Else report error - Do nothing. We can encode any other 32-bit fp literal (e.g. v_trunc_f32 v0, 10000000.0) - Parsed binary literal: - Is this literal inlinable (e.g. v_trunc_f32_e32 v0, 35) - do nothing - Else, are we required to inline this literal (e.g. v_trunc_f32_e64 v0, 35) - report error - Else, literal is not-inlinable and we are not required to inline it - Are high 32 bit of literal zeroes or same as sign bit (32 bit) - do nothing (e.g. v_trunc_f32 v0, 0xdeadbeef) - Else - report error (e.g. v_trunc_f32 v0, 0x123456789abcdef0) For this change it is required that we know operand types of instruction (are they f32/64 or b32/64). I added several new register operands (they extend previous register operands) and set operand types to corresponding types: ''' enum OperandType { OPERAND_REG_IMM32_INT, OPERAND_REG_IMM32_FP, OPERAND_REG_INLINE_C_INT, OPERAND_REG_INLINE_C_FP, } ''' This is not working yet: - Several tests are failing - Problems with predicate methods for inline immediates - LLVM generated assembler parts try to select e64 encoding before e32. More changes are required for several AsmOperands. Reviewers: vpykhtin, tstellarAMD Subscribers: arsenm, kzhuravl, artem.tamazov Differential Revision: https://reviews.llvm.org/D22922 llvm-svn: 281050
2016-09-09 22:44:04 +08:00
class MCInstrDesc;
class MCRegisterClass;
AMDGPU] Assembler: better support for immediate literals in assembler. Summary: Prevously assembler parsed all literals as either 32-bit integers or 32-bit floating-point values. Because of this we couldn't support f64 literals. E.g. in instruction "v_fract_f64 v[0:1], 0.5", literal 0.5 was encoded as 32-bit literal 0x3f000000, which is incorrect and will be interpreted as 3.0517578125E-5 instead of 0.5. Correct encoding is inline constant 240 (optimal) or 32-bit literal 0x3FE00000 at least. With this change the way immediate literals are parsed is changed. All literals are always parsed as 64-bit values either integer or floating-point. Then we convert parsed literals to correct form based on information about type of operand parsed (was literal floating or binary) and type of expected instruction operands (is this f32/64 or b32/64 instruction). Here are rules how we convert literals: - We parsed fp literal: - Instruction expects 64-bit operand: - If parsed literal is inlinable (e.g. v_fract_f64_e32 v[0:1], 0.5) - then we do nothing this literal - Else if literal is not-inlinable but instruction requires to inline it (e.g. this is e64 encoding, v_fract_f64_e64 v[0:1], 1.5) - report error - Else literal is not-inlinable but we can encode it as additional 32-bit literal constant - If instruction expect fp operand type (f64) - Check if low 32 bits of literal are zeroes (e.g. v_fract_f64 v[0:1], 1.5) - If so then do nothing - Else (e.g. v_fract_f64 v[0:1], 3.1415) - report warning that low 32 bits will be set to zeroes and precision will be lost - set low 32 bits of literal to zeroes - Instruction expects integer operand type (e.g. s_mov_b64_e32 s[0:1], 1.5) - report error as it is unclear how to encode this literal - Instruction expects 32-bit operand: - Convert parsed 64 bit fp literal to 32 bit fp. Allow lose of precision but not overflow or underflow - Is this literal inlinable and are we required to inline literal (e.g. v_trunc_f32_e64 v0, 0.5) - do nothing - Else report error - Do nothing. We can encode any other 32-bit fp literal (e.g. v_trunc_f32 v0, 10000000.0) - Parsed binary literal: - Is this literal inlinable (e.g. v_trunc_f32_e32 v0, 35) - do nothing - Else, are we required to inline this literal (e.g. v_trunc_f32_e64 v0, 35) - report error - Else, literal is not-inlinable and we are not required to inline it - Are high 32 bit of literal zeroes or same as sign bit (32 bit) - do nothing (e.g. v_trunc_f32 v0, 0xdeadbeef) - Else - report error (e.g. v_trunc_f32 v0, 0x123456789abcdef0) For this change it is required that we know operand types of instruction (are they f32/64 or b32/64). I added several new register operands (they extend previous register operands) and set operand types to corresponding types: ''' enum OperandType { OPERAND_REG_IMM32_INT, OPERAND_REG_IMM32_FP, OPERAND_REG_INLINE_C_INT, OPERAND_REG_INLINE_C_FP, } ''' This is not working yet: - Several tests are failing - Problems with predicate methods for inline immediates - LLVM generated assembler parts try to select e64 encoding before e32. More changes are required for several AsmOperands. Reviewers: vpykhtin, tstellarAMD Subscribers: arsenm, kzhuravl, artem.tamazov Differential Revision: https://reviews.llvm.org/D22922 llvm-svn: 281050
2016-09-09 22:44:04 +08:00
class MCRegisterInfo;
class MCSection;
class MCSubtargetInfo;
namespace AMDGPU {
LLVM_READONLY
int16_t getNamedOperandIdx(uint16_t Opcode, uint16_t NamedIdx);
struct IsaVersion {
unsigned Major;
unsigned Minor;
unsigned Stepping;
};
IsaVersion getIsaVersion(const FeatureBitset &Features);
void initDefaultAMDKernelCodeT(amd_kernel_code_t &Header,
const FeatureBitset &Features);
MCSection *getHSATextSection(MCContext &Ctx);
MCSection *getHSADataGlobalAgentSection(MCContext &Ctx);
MCSection *getHSADataGlobalProgramSection(MCContext &Ctx);
MCSection *getHSARodataReadonlyAgentSection(MCContext &Ctx);
bool isGroupSegment(const GlobalValue *GV);
bool isGlobalSegment(const GlobalValue *GV);
bool isReadOnlySegment(const GlobalValue *GV);
/// \returns True if constants should be emitted to .text section for given
/// target triple \p TT, false otherwise.
bool shouldEmitConstantsToTextSection(const Triple &TT);
/// \returns Integer value requested using \p F's \p Name attribute.
///
/// \returns \p Default if attribute is not present.
///
/// \returns \p Default and emits error if requested value cannot be converted
/// to integer.
int getIntegerAttribute(const Function &F, StringRef Name, int Default);
/// \returns A pair of integer values requested using \p F's \p Name attribute
/// in "first[,second]" format ("second" is optional unless \p OnlyFirstRequired
/// is false).
///
/// \returns \p Default if attribute is not present.
///
/// \returns \p Default and emits error if one of the requested values cannot be
/// converted to integer, or \p OnlyFirstRequired is false and "second" value is
/// not present.
std::pair<int, int> getIntegerPairAttribute(const Function &F,
StringRef Name,
std::pair<int, int> Default,
bool OnlyFirstRequired = false);
/// \returns Waitcnt bit mask for given isa \p Version.
unsigned getWaitcntBitMask(IsaVersion Version);
/// \returns Vmcnt bit mask for given isa \p Version.
unsigned getVmcntBitMask(IsaVersion Version);
/// \returns Expcnt bit mask for given isa \p Version.
unsigned getExpcntBitMask(IsaVersion Version);
/// \returns Lgkmcnt bit mask for given isa \p Version.
unsigned getLgkmcntBitMask(IsaVersion Version);
/// \returns Decoded Vmcnt from given \p Waitcnt for given isa \p Version.
unsigned decodeVmcnt(IsaVersion Version, unsigned Waitcnt);
/// \returns Decoded Expcnt from given \p Waitcnt for given isa \p Version.
unsigned decodeExpcnt(IsaVersion Version, unsigned Waitcnt);
/// \returns Decoded Lgkmcnt from given \p Waitcnt for given isa \p Version.
unsigned decodeLgkmcnt(IsaVersion Version, unsigned Waitcnt);
/// \brief Decodes Vmcnt, Expcnt and Lgkmcnt from given \p Waitcnt for given isa
/// \p Version, and writes decoded values into \p Vmcnt, \p Expcnt and
/// \p Lgkmcnt respectively.
///
/// \details \p Vmcnt, \p Expcnt and \p Lgkmcnt are decoded as follows:
/// \p Vmcnt = \p Waitcnt[3:0]
/// \p Expcnt = \p Waitcnt[6:4]
/// \p Lgkmcnt = \p Waitcnt[11:8]
void decodeWaitcnt(IsaVersion Version, unsigned Waitcnt,
unsigned &Vmcnt, unsigned &Expcnt, unsigned &Lgkmcnt);
/// \returns \p Waitcnt with encoded \p Vmcnt for given isa \p Version.
unsigned encodeVmcnt(IsaVersion Version, unsigned Waitcnt, unsigned Vmcnt);
/// \returns \p Waitcnt with encoded \p Expcnt for given isa \p Version.
unsigned encodeExpcnt(IsaVersion Version, unsigned Waitcnt, unsigned Expcnt);
/// \returns \p Waitcnt with encoded \p Lgkmcnt for given isa \p Version.
unsigned encodeLgkmcnt(IsaVersion Version, unsigned Waitcnt, unsigned Lgkmcnt);
/// \brief Encodes \p Vmcnt, \p Expcnt and \p Lgkmcnt into Waitcnt for given isa
/// \p Version.
///
/// \details \p Vmcnt, \p Expcnt and \p Lgkmcnt are encoded as follows:
/// Waitcnt[3:0] = \p Vmcnt
/// Waitcnt[6:4] = \p Expcnt
/// Waitcnt[11:8] = \p Lgkmcnt
///
/// \returns Waitcnt with encoded \p Vmcnt, \p Expcnt and \p Lgkmcnt for given
/// isa \p Version.
unsigned encodeWaitcnt(IsaVersion Version,
unsigned Vmcnt, unsigned Expcnt, unsigned Lgkmcnt);
unsigned getInitialPSInputAddr(const Function &F);
bool isShader(CallingConv::ID cc);
bool isCompute(CallingConv::ID cc);
bool isSI(const MCSubtargetInfo &STI);
bool isCI(const MCSubtargetInfo &STI);
bool isVI(const MCSubtargetInfo &STI);
/// If \p Reg is a pseudo reg, return the correct hardware register given
/// \p STI otherwise return \p Reg.
unsigned getMCReg(unsigned Reg, const MCSubtargetInfo &STI);
AMDGPU] Assembler: better support for immediate literals in assembler. Summary: Prevously assembler parsed all literals as either 32-bit integers or 32-bit floating-point values. Because of this we couldn't support f64 literals. E.g. in instruction "v_fract_f64 v[0:1], 0.5", literal 0.5 was encoded as 32-bit literal 0x3f000000, which is incorrect and will be interpreted as 3.0517578125E-5 instead of 0.5. Correct encoding is inline constant 240 (optimal) or 32-bit literal 0x3FE00000 at least. With this change the way immediate literals are parsed is changed. All literals are always parsed as 64-bit values either integer or floating-point. Then we convert parsed literals to correct form based on information about type of operand parsed (was literal floating or binary) and type of expected instruction operands (is this f32/64 or b32/64 instruction). Here are rules how we convert literals: - We parsed fp literal: - Instruction expects 64-bit operand: - If parsed literal is inlinable (e.g. v_fract_f64_e32 v[0:1], 0.5) - then we do nothing this literal - Else if literal is not-inlinable but instruction requires to inline it (e.g. this is e64 encoding, v_fract_f64_e64 v[0:1], 1.5) - report error - Else literal is not-inlinable but we can encode it as additional 32-bit literal constant - If instruction expect fp operand type (f64) - Check if low 32 bits of literal are zeroes (e.g. v_fract_f64 v[0:1], 1.5) - If so then do nothing - Else (e.g. v_fract_f64 v[0:1], 3.1415) - report warning that low 32 bits will be set to zeroes and precision will be lost - set low 32 bits of literal to zeroes - Instruction expects integer operand type (e.g. s_mov_b64_e32 s[0:1], 1.5) - report error as it is unclear how to encode this literal - Instruction expects 32-bit operand: - Convert parsed 64 bit fp literal to 32 bit fp. Allow lose of precision but not overflow or underflow - Is this literal inlinable and are we required to inline literal (e.g. v_trunc_f32_e64 v0, 0.5) - do nothing - Else report error - Do nothing. We can encode any other 32-bit fp literal (e.g. v_trunc_f32 v0, 10000000.0) - Parsed binary literal: - Is this literal inlinable (e.g. v_trunc_f32_e32 v0, 35) - do nothing - Else, are we required to inline this literal (e.g. v_trunc_f32_e64 v0, 35) - report error - Else, literal is not-inlinable and we are not required to inline it - Are high 32 bit of literal zeroes or same as sign bit (32 bit) - do nothing (e.g. v_trunc_f32 v0, 0xdeadbeef) - Else - report error (e.g. v_trunc_f32 v0, 0x123456789abcdef0) For this change it is required that we know operand types of instruction (are they f32/64 or b32/64). I added several new register operands (they extend previous register operands) and set operand types to corresponding types: ''' enum OperandType { OPERAND_REG_IMM32_INT, OPERAND_REG_IMM32_FP, OPERAND_REG_INLINE_C_INT, OPERAND_REG_INLINE_C_FP, } ''' This is not working yet: - Several tests are failing - Problems with predicate methods for inline immediates - LLVM generated assembler parts try to select e64 encoding before e32. More changes are required for several AsmOperands. Reviewers: vpykhtin, tstellarAMD Subscribers: arsenm, kzhuravl, artem.tamazov Differential Revision: https://reviews.llvm.org/D22922 llvm-svn: 281050
2016-09-09 22:44:04 +08:00
/// \brief Can this operand also contain immediate values?
bool isSISrcOperand(const MCInstrDesc &Desc, unsigned OpNo);
/// \brief Is this floating-point operand?
bool isSISrcFPOperand(const MCInstrDesc &Desc, unsigned OpNo);
/// \brief Does this opearnd support only inlinable literals?
bool isSISrcInlinableOperand(const MCInstrDesc &Desc, unsigned OpNo);
/// \brief Get the size in bits of a register from the register class \p RC.
unsigned getRegBitWidth(unsigned RCID);
/// \brief Get the size in bits of a register from the register class \p RC.
unsigned getRegBitWidth(const MCRegisterClass &RC);
AMDGPU] Assembler: better support for immediate literals in assembler. Summary: Prevously assembler parsed all literals as either 32-bit integers or 32-bit floating-point values. Because of this we couldn't support f64 literals. E.g. in instruction "v_fract_f64 v[0:1], 0.5", literal 0.5 was encoded as 32-bit literal 0x3f000000, which is incorrect and will be interpreted as 3.0517578125E-5 instead of 0.5. Correct encoding is inline constant 240 (optimal) or 32-bit literal 0x3FE00000 at least. With this change the way immediate literals are parsed is changed. All literals are always parsed as 64-bit values either integer or floating-point. Then we convert parsed literals to correct form based on information about type of operand parsed (was literal floating or binary) and type of expected instruction operands (is this f32/64 or b32/64 instruction). Here are rules how we convert literals: - We parsed fp literal: - Instruction expects 64-bit operand: - If parsed literal is inlinable (e.g. v_fract_f64_e32 v[0:1], 0.5) - then we do nothing this literal - Else if literal is not-inlinable but instruction requires to inline it (e.g. this is e64 encoding, v_fract_f64_e64 v[0:1], 1.5) - report error - Else literal is not-inlinable but we can encode it as additional 32-bit literal constant - If instruction expect fp operand type (f64) - Check if low 32 bits of literal are zeroes (e.g. v_fract_f64 v[0:1], 1.5) - If so then do nothing - Else (e.g. v_fract_f64 v[0:1], 3.1415) - report warning that low 32 bits will be set to zeroes and precision will be lost - set low 32 bits of literal to zeroes - Instruction expects integer operand type (e.g. s_mov_b64_e32 s[0:1], 1.5) - report error as it is unclear how to encode this literal - Instruction expects 32-bit operand: - Convert parsed 64 bit fp literal to 32 bit fp. Allow lose of precision but not overflow or underflow - Is this literal inlinable and are we required to inline literal (e.g. v_trunc_f32_e64 v0, 0.5) - do nothing - Else report error - Do nothing. We can encode any other 32-bit fp literal (e.g. v_trunc_f32 v0, 10000000.0) - Parsed binary literal: - Is this literal inlinable (e.g. v_trunc_f32_e32 v0, 35) - do nothing - Else, are we required to inline this literal (e.g. v_trunc_f32_e64 v0, 35) - report error - Else, literal is not-inlinable and we are not required to inline it - Are high 32 bit of literal zeroes or same as sign bit (32 bit) - do nothing (e.g. v_trunc_f32 v0, 0xdeadbeef) - Else - report error (e.g. v_trunc_f32 v0, 0x123456789abcdef0) For this change it is required that we know operand types of instruction (are they f32/64 or b32/64). I added several new register operands (they extend previous register operands) and set operand types to corresponding types: ''' enum OperandType { OPERAND_REG_IMM32_INT, OPERAND_REG_IMM32_FP, OPERAND_REG_INLINE_C_INT, OPERAND_REG_INLINE_C_FP, } ''' This is not working yet: - Several tests are failing - Problems with predicate methods for inline immediates - LLVM generated assembler parts try to select e64 encoding before e32. More changes are required for several AsmOperands. Reviewers: vpykhtin, tstellarAMD Subscribers: arsenm, kzhuravl, artem.tamazov Differential Revision: https://reviews.llvm.org/D22922 llvm-svn: 281050
2016-09-09 22:44:04 +08:00
/// \brief Get size of register operand
unsigned getRegOperandSize(const MCRegisterInfo *MRI, const MCInstrDesc &Desc,
unsigned OpNo);
/// \brief Is this literal inlinable
bool isInlinableLiteral64(int64_t Literal, bool IsVI);
bool isInlinableLiteral32(int32_t Literal, bool IsVI);
} // end namespace AMDGPU
} // end namespace llvm
#endif