mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
247 lines
8.6 KiB
C++
247 lines
8.6 KiB
C++
//===- AMDGPUEmitPrintf.cpp -----------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Utility function to lower a printf call into a series of device
|
|
// library calls on the AMDGPU target.
|
|
//
|
|
// WARNING: This file knows about certain library functions. It recognizes them
|
|
// by name, and hardwires knowledge of their semantics.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Transforms/Utils/AMDGPUEmitPrintf.h"
|
|
#include "llvm/ADT/SparseBitVector.h"
|
|
#include "llvm/Analysis/ValueTracking.h"
|
|
#include "llvm/IR/IRBuilder.h"
|
|
|
|
#include <iostream>
|
|
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "amdgpu-emit-printf"
|
|
|
|
static bool isCString(const Value *Arg) {
|
|
auto Ty = Arg->getType();
|
|
auto PtrTy = dyn_cast<PointerType>(Ty);
|
|
if (!PtrTy)
|
|
return false;
|
|
|
|
auto IntTy = dyn_cast<IntegerType>(PtrTy->getElementType());
|
|
if (!IntTy)
|
|
return false;
|
|
|
|
return IntTy->getBitWidth() == 8;
|
|
}
|
|
|
|
static Value *fitArgInto64Bits(IRBuilder<> &Builder, Value *Arg) {
|
|
auto Int64Ty = Builder.getInt64Ty();
|
|
auto Ty = Arg->getType();
|
|
|
|
if (auto IntTy = dyn_cast<IntegerType>(Ty)) {
|
|
switch (IntTy->getBitWidth()) {
|
|
case 32:
|
|
return Builder.CreateZExt(Arg, Int64Ty);
|
|
case 64:
|
|
return Arg;
|
|
}
|
|
}
|
|
|
|
if (Ty->getTypeID() == Type::DoubleTyID) {
|
|
return Builder.CreateBitCast(Arg, Int64Ty);
|
|
}
|
|
|
|
if (isa<PointerType>(Ty)) {
|
|
return Builder.CreatePtrToInt(Arg, Int64Ty);
|
|
}
|
|
|
|
llvm_unreachable("unexpected type");
|
|
}
|
|
|
|
static Value *callPrintfBegin(IRBuilder<> &Builder, Value *Version) {
|
|
auto Int64Ty = Builder.getInt64Ty();
|
|
auto M = Builder.GetInsertBlock()->getModule();
|
|
auto Fn = M->getOrInsertFunction("__ockl_printf_begin", Int64Ty, Int64Ty);
|
|
return Builder.CreateCall(Fn, Version);
|
|
}
|
|
|
|
static Value *callAppendArgs(IRBuilder<> &Builder, Value *Desc, int NumArgs,
|
|
Value *Arg0, Value *Arg1, Value *Arg2, Value *Arg3,
|
|
Value *Arg4, Value *Arg5, Value *Arg6,
|
|
bool IsLast) {
|
|
auto Int64Ty = Builder.getInt64Ty();
|
|
auto Int32Ty = Builder.getInt32Ty();
|
|
auto M = Builder.GetInsertBlock()->getModule();
|
|
auto Fn = M->getOrInsertFunction("__ockl_printf_append_args", Int64Ty,
|
|
Int64Ty, Int32Ty, Int64Ty, Int64Ty, Int64Ty,
|
|
Int64Ty, Int64Ty, Int64Ty, Int64Ty, Int32Ty);
|
|
auto IsLastValue = Builder.getInt32(IsLast);
|
|
auto NumArgsValue = Builder.getInt32(NumArgs);
|
|
return Builder.CreateCall(Fn, {Desc, NumArgsValue, Arg0, Arg1, Arg2, Arg3,
|
|
Arg4, Arg5, Arg6, IsLastValue});
|
|
}
|
|
|
|
static Value *appendArg(IRBuilder<> &Builder, Value *Desc, Value *Arg,
|
|
bool IsLast) {
|
|
auto Arg0 = fitArgInto64Bits(Builder, Arg);
|
|
auto Zero = Builder.getInt64(0);
|
|
return callAppendArgs(Builder, Desc, 1, Arg0, Zero, Zero, Zero, Zero, Zero,
|
|
Zero, IsLast);
|
|
}
|
|
|
|
// The device library does not provide strlen, so we build our own loop
|
|
// here. While we are at it, we also include the terminating null in the length.
|
|
static Value *getStrlenWithNull(IRBuilder<> &Builder, Value *Str) {
|
|
auto *Prev = Builder.GetInsertBlock();
|
|
Module *M = Prev->getModule();
|
|
|
|
auto CharZero = Builder.getInt8(0);
|
|
auto One = Builder.getInt64(1);
|
|
auto Zero = Builder.getInt64(0);
|
|
auto Int64Ty = Builder.getInt64Ty();
|
|
|
|
// The length is either zero for a null pointer, or the computed value for an
|
|
// actual string. We need a join block for a phi that represents the final
|
|
// value.
|
|
//
|
|
// Strictly speaking, the zero does not matter since
|
|
// __ockl_printf_append_string_n ignores the length if the pointer is null.
|
|
BasicBlock *Join = nullptr;
|
|
if (Prev->getTerminator()) {
|
|
Join = Prev->splitBasicBlock(Builder.GetInsertPoint(),
|
|
"strlen.join");
|
|
Prev->getTerminator()->eraseFromParent();
|
|
} else {
|
|
Join = BasicBlock::Create(M->getContext(), "strlen.join",
|
|
Prev->getParent());
|
|
}
|
|
BasicBlock *While =
|
|
BasicBlock::Create(M->getContext(), "strlen.while",
|
|
Prev->getParent(), Join);
|
|
BasicBlock *WhileDone = BasicBlock::Create(
|
|
M->getContext(), "strlen.while.done",
|
|
Prev->getParent(), Join);
|
|
|
|
// Emit an early return for when the pointer is null.
|
|
Builder.SetInsertPoint(Prev);
|
|
auto CmpNull =
|
|
Builder.CreateICmpEQ(Str, Constant::getNullValue(Str->getType()));
|
|
BranchInst::Create(Join, While, CmpNull, Prev);
|
|
|
|
// Entry to the while loop.
|
|
Builder.SetInsertPoint(While);
|
|
|
|
auto PtrPhi = Builder.CreatePHI(Str->getType(), 2);
|
|
PtrPhi->addIncoming(Str, Prev);
|
|
auto PtrNext = Builder.CreateGEP(PtrPhi, One);
|
|
PtrPhi->addIncoming(PtrNext, While);
|
|
|
|
// Condition for the while loop.
|
|
auto Data = Builder.CreateLoad(PtrPhi);
|
|
auto Cmp = Builder.CreateICmpEQ(Data, CharZero);
|
|
Builder.CreateCondBr(Cmp, WhileDone, While);
|
|
|
|
// Add one to the computed length.
|
|
Builder.SetInsertPoint(WhileDone, WhileDone->begin());
|
|
auto Begin = Builder.CreatePtrToInt(Str, Int64Ty);
|
|
auto End = Builder.CreatePtrToInt(PtrPhi, Int64Ty);
|
|
auto Len = Builder.CreateSub(End, Begin);
|
|
Len = Builder.CreateAdd(Len, One);
|
|
|
|
// Final join.
|
|
BranchInst::Create(Join, WhileDone);
|
|
Builder.SetInsertPoint(Join, Join->begin());
|
|
auto LenPhi = Builder.CreatePHI(Len->getType(), 2);
|
|
LenPhi->addIncoming(Len, WhileDone);
|
|
LenPhi->addIncoming(Zero, Prev);
|
|
|
|
return LenPhi;
|
|
}
|
|
|
|
static Value *callAppendStringN(IRBuilder<> &Builder, Value *Desc, Value *Str,
|
|
Value *Length, bool isLast) {
|
|
auto Int64Ty = Builder.getInt64Ty();
|
|
auto CharPtrTy = Builder.getInt8PtrTy();
|
|
auto Int32Ty = Builder.getInt32Ty();
|
|
auto M = Builder.GetInsertBlock()->getModule();
|
|
auto Fn = M->getOrInsertFunction("__ockl_printf_append_string_n", Int64Ty,
|
|
Int64Ty, CharPtrTy, Int64Ty, Int32Ty);
|
|
auto IsLastInt32 = Builder.getInt32(isLast);
|
|
return Builder.CreateCall(Fn, {Desc, Str, Length, IsLastInt32});
|
|
}
|
|
|
|
static Value *appendString(IRBuilder<> &Builder, Value *Desc, Value *Arg,
|
|
bool IsLast) {
|
|
auto Length = getStrlenWithNull(Builder, Arg);
|
|
return callAppendStringN(Builder, Desc, Arg, Length, IsLast);
|
|
}
|
|
|
|
static Value *processArg(IRBuilder<> &Builder, Value *Desc, Value *Arg,
|
|
bool SpecIsCString, bool IsLast) {
|
|
if (SpecIsCString && isCString(Arg)) {
|
|
return appendString(Builder, Desc, Arg, IsLast);
|
|
}
|
|
// If the format specifies a string but the argument is not, the frontend will
|
|
// have printed a warning. We just rely on undefined behaviour and send the
|
|
// argument anyway.
|
|
return appendArg(Builder, Desc, Arg, IsLast);
|
|
}
|
|
|
|
// Scan the format string to locate all specifiers, and mark the ones that
|
|
// specify a string, i.e, the "%s" specifier with optional '*' characters.
|
|
static void locateCStrings(SparseBitVector<8> &BV, Value *Fmt) {
|
|
StringRef Str;
|
|
if (!getConstantStringInfo(Fmt, Str) || Str.empty())
|
|
return;
|
|
|
|
static const char ConvSpecifiers[] = "diouxXfFeEgGaAcspn";
|
|
size_t SpecPos = 0;
|
|
// Skip the first argument, the format string.
|
|
unsigned ArgIdx = 1;
|
|
|
|
while ((SpecPos = Str.find_first_of('%', SpecPos)) != StringRef::npos) {
|
|
if (Str[SpecPos + 1] == '%') {
|
|
SpecPos += 2;
|
|
continue;
|
|
}
|
|
auto SpecEnd = Str.find_first_of(ConvSpecifiers, SpecPos);
|
|
if (SpecEnd == StringRef::npos)
|
|
return;
|
|
auto Spec = Str.slice(SpecPos, SpecEnd + 1);
|
|
ArgIdx += Spec.count('*');
|
|
if (Str[SpecEnd] == 's') {
|
|
BV.set(ArgIdx);
|
|
}
|
|
SpecPos = SpecEnd + 1;
|
|
++ArgIdx;
|
|
}
|
|
}
|
|
|
|
Value *llvm::emitAMDGPUPrintfCall(IRBuilder<> &Builder,
|
|
ArrayRef<Value *> Args) {
|
|
auto NumOps = Args.size();
|
|
assert(NumOps >= 1);
|
|
|
|
auto Fmt = Args[0];
|
|
SparseBitVector<8> SpecIsCString;
|
|
locateCStrings(SpecIsCString, Fmt);
|
|
|
|
auto Desc = callPrintfBegin(Builder, Builder.getIntN(64, 0));
|
|
Desc = appendString(Builder, Desc, Fmt, NumOps == 1);
|
|
|
|
// FIXME: This invokes hostcall once for each argument. We can pack up to
|
|
// seven scalar printf arguments in a single hostcall. See the signature of
|
|
// callAppendArgs().
|
|
for (unsigned int i = 1; i != NumOps; ++i) {
|
|
bool IsLast = i == NumOps - 1;
|
|
bool IsCString = SpecIsCString.test(i);
|
|
Desc = processArg(Builder, Desc, Args[i], IsCString, IsLast);
|
|
}
|
|
|
|
return Builder.CreateTrunc(Desc, Builder.getInt32Ty());
|
|
}
|