WebAssemblyFastISel.cpp File Reference

This file defines the WebAssembly-specific support for the FastISel class. More...

#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "Utils/WasmAddressSpaces.h"
#include "Utils/WebAssemblyTypeUtilities.h"
#include "WebAssemblyMachineFunctionInfo.h"
#include "WebAssemblySubtarget.h"
#include "WebAssemblyUtilities.h"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GetElementPtrTypeIterator.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Operator.h"
#include "WebAssemblyGenFastISel.inc"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "wasm-fastisel"

Functions
static unsigned	getSExtLoadOpcode (unsigned LoadSize, bool I64Result, bool A64)
static unsigned	getZExtLoadOpcode (unsigned LoadSize, bool I64Result, bool A64)
static bool	isFoldableSExtOpcode (unsigned Opc)
static bool	isI64SExtResult (unsigned Opc)
static unsigned	getFoldedLoadOpcode (MachineInstr *MI, MachineRegisterInfo &MRI, const LoadInst *LI, bool A64)
static unsigned	getFoldedI64LoadOpcode (Register DestReg, const LoadInst *LI, MachineRegisterInfo &MRI, bool A64, MachineInstr *&OuterUserMI, unsigned NarrowOpc)
static unsigned	matchFoldableShift (MachineInstr *MI, const LoadInst *LI, MachineRegisterInfo &MRI, bool A64, MachineInstr *&UserMI, MachineInstr *&OuterUserMI)
	Matches a sign-extension pattern (shl + shr_s) to fold it into a signed load.
static unsigned	matchFoldableSExtFromPromotedI32 (MachineInstr *MI, const LoadInst *LI, MachineRegisterInfo &MRI, bool A64, MachineInstr *&UserMI)
static unsigned	matchFoldableCopyToI64Ext (MachineInstr *MI, const LoadInst *LI, MachineRegisterInfo &MRI, bool A64, MachineInstr *&OuterUserMI)
static unsigned	matchFoldableAnd (MachineInstr *MI, const LoadInst *LI, MachineRegisterInfo &MRI, bool A64, MachineInstr *&OuterUserMI)

Detailed Description

This file defines the WebAssembly-specific support for the FastISel class.

Some of the target-specific code is generated by tablegen in the file WebAssemblyGenFastISel.inc, which is #included here.

TODO: kill flags

Definition in file WebAssemblyFastISel.cpp.

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "wasm-fastisel"

Definition at line 42 of file WebAssemblyFastISel.cpp.

Function Documentation

getFoldedI64LoadOpcode()

unsigned getFoldedI64LoadOpcode ( Register DestReg, const LoadInst * LI, MachineRegisterInfo & MRI, bool A64, MachineInstr *& OuterUserMI, unsigned NarrowOpc )

static

Definition at line 1380 of file WebAssemblyFastISel.cpp.

References llvm::MachineInstr::getOpcode(), llvm::Type::getPrimitiveSizeInBits(), getSExtLoadOpcode(), llvm::Value::getType(), getZExtLoadOpcode(), llvm::MachineRegisterInfo::hasOneNonDBGUse(), and llvm::MachineRegisterInfo::use_instr_nodbg_begin().

Referenced by matchFoldableAnd(), and matchFoldableShift().

getFoldedLoadOpcode()

unsigned getFoldedLoadOpcode ( MachineInstr * MI, MachineRegisterInfo & MRI, const LoadInst * LI, bool A64 )

static

Definition at line 1368 of file WebAssemblyFastISel.cpp.

References llvm::Type::getPrimitiveSizeInBits(), getSExtLoadOpcode(), llvm::Value::getType(), isFoldableSExtOpcode(), isI64SExtResult(), MI, and Opc.

getSExtLoadOpcode()

unsigned getSExtLoadOpcode ( unsigned LoadSize, bool I64Result, bool A64 )

static

Definition at line 1287 of file WebAssemblyFastISel.cpp.

Referenced by getFoldedI64LoadOpcode(), getFoldedLoadOpcode(), matchFoldableCopyToI64Ext(), matchFoldableSExtFromPromotedI32(), and matchFoldableShift().

getZExtLoadOpcode()

unsigned getZExtLoadOpcode ( unsigned LoadSize, bool I64Result, bool A64 )

static

Definition at line 1313 of file WebAssemblyFastISel.cpp.

Referenced by getFoldedI64LoadOpcode(), matchFoldableAnd(), and matchFoldableCopyToI64Ext().

isFoldableSExtOpcode()

bool isFoldableSExtOpcode ( unsigned Opc )

static

Definition at line 1339 of file WebAssemblyFastISel.cpp.

References Opc.

Referenced by getFoldedLoadOpcode().

isI64SExtResult()

bool isI64SExtResult ( unsigned Opc )

static

Definition at line 1353 of file WebAssemblyFastISel.cpp.

References llvm_unreachable, and Opc.

Referenced by getFoldedLoadOpcode().

matchFoldableAnd()

unsigned matchFoldableAnd ( MachineInstr * MI, const LoadInst * LI, MachineRegisterInfo & MRI, bool A64, MachineInstr *& OuterUserMI )

static

Definition at line 1504 of file WebAssemblyFastISel.cpp.

References DefMI, getFoldedI64LoadOpcode(), llvm::Type::getPrimitiveSizeInBits(), llvm::Value::getType(), llvm::MachineRegisterInfo::getUniqueVRegDef(), getZExtLoadOpcode(), I, llvm::maskTrailingOnes(), MI, and Reg.

matchFoldableCopyToI64Ext()

unsigned matchFoldableCopyToI64Ext ( MachineInstr * MI, const LoadInst * LI, MachineRegisterInfo & MRI, bool A64, MachineInstr *& OuterUserMI )

static

Definition at line 1479 of file WebAssemblyFastISel.cpp.

References llvm::MachineInstr::getOpcode(), llvm::Type::getPrimitiveSizeInBits(), getSExtLoadOpcode(), llvm::Value::getType(), getZExtLoadOpcode(), llvm::MachineRegisterInfo::hasOneNonDBGUse(), MI, and llvm::MachineRegisterInfo::use_instr_nodbg_begin().

matchFoldableSExtFromPromotedI32()

unsigned matchFoldableSExtFromPromotedI32 ( MachineInstr * MI, const LoadInst * LI, MachineRegisterInfo & MRI, bool A64, MachineInstr *& UserMI )

static

Definition at line 1451 of file WebAssemblyFastISel.cpp.

References llvm::MachineInstr::getOpcode(), llvm::Type::getPrimitiveSizeInBits(), getSExtLoadOpcode(), llvm::Value::getType(), llvm::MachineRegisterInfo::hasOneNonDBGUse(), MI, and llvm::MachineRegisterInfo::use_instr_nodbg_begin().

matchFoldableShift()

unsigned matchFoldableShift ( MachineInstr * MI, const LoadInst * LI, MachineRegisterInfo & MRI, bool A64, MachineInstr *& UserMI, MachineInstr *& OuterUserMI )

static

Matches a sign-extension pattern (shl + shr_s) to fold it into a signed load.

FastISel assumes that 'sext' from i8 or i16 will first be lowered to a 32-bit zero-extending load (i32.load8_u / i32.load16_u) followed by 32-bit shifts, even when extending to i64. Therefore, this function only matches 32-bit shifts (SHL_I32 / SHR_S_I32) and specifically checks if both shift amounts are identical, compile-time constants that match the exact extension size (32 - LoadBitWidth).

Definition at line 1408 of file WebAssemblyFastISel.cpp.

References getFoldedI64LoadOpcode(), llvm::Type::getIntegerBitWidth(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getReg(), getSExtLoadOpcode(), llvm::Value::getType(), llvm::MachineRegisterInfo::getUniqueVRegDef(), llvm::MachineRegisterInfo::hasOneNonDBGUse(), llvm::Type::isIntegerTy(), MI, Opc, and llvm::MachineRegisterInfo::use_instr_nodbg_begin().