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098c4910ded1e1fda240d1d9b772b6d46da12dfa
ispc/ispc.cpp
Matt Pharr 972043c146 Fix serious bug in handling constant-valued initializers. 
In InitSymbol(), we try to be smart and emit a memcpy when there
are a number of values to store (e.g. for arrays, structs, etc.)

Unfortunately, this wasn't working as desired for bools (i.e. i1 types),
since the SizeOf() call that tried to figure out how many bytes to
copy would return 0 bytes, due to dividing the number of bits to copy
by 8.

Fixes issue #234.
2012-04-09 14:23:08 -07:00

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21 KiB
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/*
Copyright (c) 2010-2012, Intel Corporation
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @file ispc.cpp
@brief ispc global definitions
*/
#include "ispc.h"
#include "module.h"
#include "util.h"
#include "llvmutil.h"
#include <stdio.h>
#ifdef ISPC_IS_WINDOWS
#include <windows.h>
#include <direct.h>
#define strcasecmp stricmp
#endif
#include <llvm/LLVMContext.h>
#include <llvm/Module.h>
#include <llvm/Analysis/DIBuilder.h>
#include <llvm/Analysis/DebugInfo.h>
#include <llvm/Support/Dwarf.h>
#include <llvm/Instructions.h>
#include <llvm/Target/TargetMachine.h>
#include <llvm/Target/TargetOptions.h>
#include <llvm/Target/TargetData.h>
#if defined(LLVM_3_0) || defined(LLVM_3_0svn) || defined(LLVM_3_1svn)
#include <llvm/Support/TargetRegistry.h>
#include <llvm/Support/TargetSelect.h>
#else
#include <llvm/Target/TargetRegistry.h>
#include <llvm/Target/TargetSelect.h>
#include <llvm/Target/SubtargetFeature.h>
#endif
#include <llvm/Support/Host.h>
Globals *g;
Module *m;
///////////////////////////////////////////////////////////////////////////
// Target
#ifndef ISPC_IS_WINDOWS
static void __cpuid(int info[4], int infoType) {
__asm__ __volatile__ ("cpuid"
: "=a" (info[0]), "=b" (info[1]), "=c" (info[2]), "=d" (info[3])
: "0" (infoType));
}
/* Save %ebx in case it's the PIC register */
static void __cpuidex(int info[4], int level, int count) {
__asm__ __volatile__ ("xchg{l}\t{%%}ebx, %1\n\t"
"cpuid\n\t"
"xchg{l}\t{%%}ebx, %1\n\t"
: "=a" (info[0]), "=r" (info[1]), "=c" (info[2]), "=d" (info[3])
: "0" (level), "2" (count));
}
#endif // ISPC_IS_WINDOWS
static const char *
lGetSystemISA() {
int info[4];
__cpuid(info, 1);
if ((info[2] & (1 << 28)) != 0) {
// AVX1 for sure. Do we have AVX2?
// Call cpuid with eax=7, ecx=0
__cpuidex(info, 7, 0);
if ((info[1] & (1 << 5)) != 0)
return "avx2";
else
return "avx";
}
else if ((info[2] & (1 << 19)) != 0)
return "sse4";
else if ((info[3] & (1 << 26)) != 0)
return "sse2";
else {
fprintf(stderr, "Unable to detect supported SSE/AVX ISA. Exiting.\n");
exit(1);
}
}
static const char *supportedCPUs[] = {
"atom", "penryn", "core2", "corei7",
#if defined(LLVM_3_0) || defined(LLVM_3_0svn) || defined(LLVM_3_1svn)
"corei7-avx"
#endif
};
bool
Target::GetTarget(const char *arch, const char *cpu, const char *isa,
bool pic, Target *t) {
if (isa == NULL) {
if (cpu != NULL) {
// If a CPU was specified explicitly, try to pick the best
// possible ISA based on that.
#if defined(LLVM_3_0) || defined(LLVM_3_0svn) || defined(LLVM_3_1svn)
if (!strcmp(cpu, "sandybridge") ||
!strcmp(cpu, "corei7-avx"))
isa = "avx";
else
#endif
if (!strcmp(cpu, "corei7") ||
!strcmp(cpu, "penryn"))
isa = "sse4";
else
isa = "sse2";
fprintf(stderr, "Notice: no --target specified on command-line. "
"Using ISA \"%s\" based on specified CPU \"%s\".\n", isa,
cpu);
}
else {
// No CPU and no ISA, so use CPUID to figure out what this CPU
// supports.
isa = lGetSystemISA();
fprintf(stderr, "Notice: no --target specified on command-line. "
"Using system ISA \"%s\".\n", isa);
}
}
if (cpu == NULL) {
std::string hostCPU = llvm::sys::getHostCPUName();
if (hostCPU.size() > 0)
cpu = strdup(hostCPU.c_str());
else {
fprintf(stderr, "Warning: unable to determine host CPU!\n");
cpu = "generic";
}
}
else {
bool foundCPU = false;
for (int i = 0; i < int(sizeof(supportedCPUs) / sizeof(supportedCPUs[0]));
++i) {
if (!strcmp(cpu, supportedCPUs[i])) {
foundCPU = true;
break;
}
}
if (foundCPU == false) {
fprintf(stderr, "Error: CPU type \"%s\" unknown. Supported CPUs: "
"%s.\n", cpu, SupportedTargetCPUs().c_str());
return false;
}
}
t->cpu = cpu;
if (arch == NULL)
arch = "x86-64";
bool error = false;
t->generatePIC = pic;
// Make sure the target architecture is a known one; print an error
// with the valid ones otherwise.
t->target = NULL;
for (llvm::TargetRegistry::iterator iter = llvm::TargetRegistry::begin();
iter != llvm::TargetRegistry::end(); ++iter) {
if (std::string(arch) == iter->getName()) {
t->target = &*iter;
break;
}
}
if (t->target == NULL) {
fprintf(stderr, "Invalid architecture \"%s\"\nOptions: ", arch);
llvm::TargetRegistry::iterator iter;
for (iter = llvm::TargetRegistry::begin();
iter != llvm::TargetRegistry::end(); ++iter)
fprintf(stderr, "%s ", iter->getName());
fprintf(stderr, "\n");
error = true;
}
else {
t->arch = arch;
}
if (!strcasecmp(isa, "sse2")) {
t->isa = Target::SSE2;
t->nativeVectorWidth = 4;
t->vectorWidth = 4;
t->attributes = "+sse,+sse2,-sse3,-sse41,-sse42,-sse4a,-ssse3,-popcnt";
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
else if (!strcasecmp(isa, "sse2-x2")) {
t->isa = Target::SSE2;
t->nativeVectorWidth = 4;
t->vectorWidth = 8;
t->attributes = "+sse,+sse2,-sse3,-sse41,-sse42,-sse4a,-ssse3,-popcnt";
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
else if (!strcasecmp(isa, "sse4")) {
t->isa = Target::SSE4;
t->nativeVectorWidth = 4;
t->vectorWidth = 4;
t->attributes = "+sse,+sse2,+sse3,+sse41,-sse42,-sse4a,+ssse3,-popcnt,+cmov";
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
else if (!strcasecmp(isa, "sse4x2") || !strcasecmp(isa, "sse4-x2")) {
t->isa = Target::SSE4;
t->nativeVectorWidth = 4;
t->vectorWidth = 8;
t->attributes = "+sse,+sse2,+sse3,+sse41,-sse42,-sse4a,+ssse3,-popcnt,+cmov";
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
else if (!strcasecmp(isa, "generic-4")) {
t->isa = Target::GENERIC;
t->nativeVectorWidth = 4;
t->vectorWidth = 4;
t->maskingIsFree = true;
t->allOffMaskIsSafe = true;
t->maskBitCount = 1;
}
else if (!strcasecmp(isa, "generic-8")) {
t->isa = Target::GENERIC;
t->nativeVectorWidth = 8;
t->vectorWidth = 8;
t->maskingIsFree = true;
t->allOffMaskIsSafe = true;
t->maskBitCount = 1;
}
else if (!strcasecmp(isa, "generic-16")) {
t->isa = Target::GENERIC;
t->nativeVectorWidth = 16;
t->vectorWidth = 16;
t->maskingIsFree = true;
t->allOffMaskIsSafe = true;
t->maskBitCount = 1;
}
else if (!strcasecmp(isa, "generic-1")) {
t->isa = Target::GENERIC;
t->nativeVectorWidth = 1;
t->vectorWidth = 1;
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
#if defined(LLVM_3_0) || defined(LLVM_3_0svn) || defined(LLVM_3_1svn)
else if (!strcasecmp(isa, "avx")) {
t->isa = Target::AVX;
t->nativeVectorWidth = 8;
t->vectorWidth = 8;
t->attributes = "+avx,+popcnt,+cmov";
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
else if (!strcasecmp(isa, "avx-x2")) {
t->isa = Target::AVX;
t->nativeVectorWidth = 8;
t->vectorWidth = 16;
t->attributes = "+avx,+popcnt,+cmov";
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
#endif // LLVM 3.0+
#if defined(LLVM_3_1svn)
else if (!strcasecmp(isa, "avx2")) {
t->isa = Target::AVX2;
t->nativeVectorWidth = 8;
t->vectorWidth = 8;
t->attributes = "+avx2,+popcnt,+cmov,+f16c";
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
else if (!strcasecmp(isa, "avx2-x2")) {
t->isa = Target::AVX2;
t->nativeVectorWidth = 16;
t->vectorWidth = 16;
t->attributes = "+avx2,+popcnt,+cmov,+f16c";
t->maskingIsFree = false;
t->allOffMaskIsSafe = false;
t->maskBitCount = 32;
}
#endif // LLVM 3.1
else {
fprintf(stderr, "Target ISA \"%s\" is unknown. Choices are: %s\n",
isa, SupportedTargetISAs());
error = true;
}
if (!error) {
llvm::TargetMachine *targetMachine = t->GetTargetMachine();
const llvm::TargetData *targetData = targetMachine->getTargetData();
t->is32Bit = (targetData->getPointerSize() == 4);
}
return !error;
}
std::string
Target::SupportedTargetCPUs() {
std::string ret;
int count = sizeof(supportedCPUs) / sizeof(supportedCPUs[0]);
for (int i = 0; i < count; ++i) {
ret += supportedCPUs[i];
if (i != count - 1)
ret += ", ";
}
return ret;
}
const char *
Target::SupportedTargetArchs() {
return "x86, x86-64";
}
const char *
Target::SupportedTargetISAs() {
return "sse2, sse2-x2, sse4, sse4-x2"
#ifndef LLVM_2_9
", avx, avx-x2"
#endif // !LLVM_2_9
#ifdef LLVM_3_1svn
", avx2, avx2-x2"
#endif // LLVM_3_1svn
", generic-4, generic-8, generic-16, generic-1";
}
std::string
Target::GetTripleString() const {
llvm::Triple triple;
// Start with the host triple as the default
#if defined(LLVM_3_1) || defined(LLVM_3_1svn)
triple.setTriple(llvm::sys::getDefaultTargetTriple());
#else
triple.setTriple(llvm::sys::getHostTriple());
#endif
// And override the arch in the host triple based on what the user
// specified. Here we need to deal with the fact that LLVM uses one
// naming convention for targets TargetRegistry, but wants some
// slightly different ones for the triple. TODO: is there a way to
// have it do this remapping, which would presumably be a bit less
// error prone?
if (arch == "x86")
triple.setArchName("i386");
else if (arch == "x86-64")
triple.setArchName("x86_64");
else
triple.setArchName(arch);
return triple.str();
}
llvm::TargetMachine *
Target::GetTargetMachine() const {
std::string triple = GetTripleString();
llvm::Reloc::Model relocModel = generatePIC ? llvm::Reloc::PIC_ :
llvm::Reloc::Default;
#if defined(LLVM_3_1svn)
std::string featuresString = attributes;
llvm::TargetOptions options;
#if 0
// This was breaking e.g. round() on SSE2, where the code we want to
// run wants to do:
// x += 0x1.0p23f;
// x -= 0x1.0p23f;
// But then LLVM was optimizing this away...
if (g->opt.fastMath == true)
options.UnsafeFPMath = 1;
#endif
llvm::TargetMachine *targetMachine =
target->createTargetMachine(triple, cpu, featuresString, options,
relocModel);
#elif defined(LLVM_3_0)
std::string featuresString = attributes;
llvm::TargetMachine *targetMachine =
target->createTargetMachine(triple, cpu, featuresString, relocModel);
#else // LLVM 2.9
#ifdef ISPC_IS_APPLE
relocModel = llvm::Reloc::PIC_;
#endif // ISPC_IS_APPLE
std::string featuresString = cpu + std::string(",") + attributes;
llvm::TargetMachine *targetMachine =
target->createTargetMachine(triple, featuresString);
#ifndef ISPC_IS_WINDOWS
targetMachine->setRelocationModel(relocModel);
#endif // !ISPC_IS_WINDOWS
#endif // LLVM_2_9
Assert(targetMachine != NULL);
targetMachine->setAsmVerbosityDefault(true);
return targetMachine;
}
const char *
Target::GetISAString() const {
switch (isa) {
case Target::SSE2:
return "sse2";
case Target::SSE4:
return "sse4";
case Target::AVX:
return "avx";
case Target::AVX2:
return "avx2";
case Target::GENERIC:
return "generic";
default:
FATAL("Unhandled target in GetISAString()");
}
return "";
}
static bool
lGenericTypeLayoutIndeterminate(LLVM_TYPE_CONST llvm::Type *type) {
if (type->isPrimitiveType() || type->isIntegerTy())
return false;
if (type == LLVMTypes::BoolVectorType ||
type == LLVMTypes::MaskType ||
type == LLVMTypes::Int1VectorType)
return true;
LLVM_TYPE_CONST llvm::ArrayType *at =
llvm::dyn_cast<LLVM_TYPE_CONST llvm::ArrayType>(type);
if (at != NULL)
return lGenericTypeLayoutIndeterminate(at->getElementType());
LLVM_TYPE_CONST llvm::PointerType *pt =
llvm::dyn_cast<LLVM_TYPE_CONST llvm::PointerType>(type);
if (pt != NULL)
return false;
LLVM_TYPE_CONST llvm::StructType *st =
llvm::dyn_cast<LLVM_TYPE_CONST llvm::StructType>(type);
if (st != NULL) {
for (int i = 0; i < (int)st->getNumElements(); ++i)
if (lGenericTypeLayoutIndeterminate(st->getElementType(i)))
return true;
return false;
}
Assert(llvm::isa<LLVM_TYPE_CONST llvm::VectorType>(type));
return true;
}
llvm::Value *
Target::SizeOf(LLVM_TYPE_CONST llvm::Type *type,
llvm::BasicBlock *insertAtEnd) {
if (isa == Target::GENERIC &&
lGenericTypeLayoutIndeterminate(type)) {
llvm::Value *index[1] = { LLVMInt32(1) };
LLVM_TYPE_CONST llvm::PointerType *ptrType = llvm::PointerType::get(type, 0);
llvm::Value *voidPtr = llvm::ConstantPointerNull::get(ptrType);
#if defined(LLVM_3_0) || defined(LLVM_3_0svn) || defined(LLVM_3_1svn)
llvm::ArrayRef<llvm::Value *> arrayRef(&index[0], &index[1]);
llvm::Instruction *gep =
llvm::GetElementPtrInst::Create(voidPtr, arrayRef, "sizeof_gep",
insertAtEnd);
#else
llvm::Instruction *gep =
llvm::GetElementPtrInst::Create(voidPtr, &index[0], &index[1],
"sizeof_gep", insertAtEnd);
#endif
if (is32Bit || g->opt.force32BitAddressing)
return new llvm::PtrToIntInst(gep, LLVMTypes::Int32Type,
"sizeof_int", insertAtEnd);
else
return new llvm::PtrToIntInst(gep, LLVMTypes::Int64Type,
"sizeof_int", insertAtEnd);
}
const llvm::TargetData *td = GetTargetMachine()->getTargetData();
Assert(td != NULL);
uint64_t bitSize = td->getTypeSizeInBits(type);
Assert((bitSize % 8) == 0);
uint64_t byteSize = bitSize / 8;
if (is32Bit || g->opt.force32BitAddressing)
return LLVMInt32((int32_t)byteSize);
else
return LLVMInt64(byteSize);
}
llvm::Value *
Target::StructOffset(LLVM_TYPE_CONST llvm::Type *type, int element,
llvm::BasicBlock *insertAtEnd) {
if (isa == Target::GENERIC &&
lGenericTypeLayoutIndeterminate(type) == true) {
llvm::Value *indices[2] = { LLVMInt32(0), LLVMInt32(element) };
LLVM_TYPE_CONST llvm::PointerType *ptrType = llvm::PointerType::get(type, 0);
llvm::Value *voidPtr = llvm::ConstantPointerNull::get(ptrType);
#if defined(LLVM_3_0) || defined(LLVM_3_0svn) || defined(LLVM_3_1svn)
llvm::ArrayRef<llvm::Value *> arrayRef(&indices[0], &indices[2]);
llvm::Instruction *gep =
llvm::GetElementPtrInst::Create(voidPtr, arrayRef, "offset_gep",
insertAtEnd);
#else
llvm::Instruction *gep =
llvm::GetElementPtrInst::Create(voidPtr, &indices[0], &indices[2],
"offset_gep", insertAtEnd);
#endif
if (is32Bit || g->opt.force32BitAddressing)
return new llvm::PtrToIntInst(gep, LLVMTypes::Int32Type,
"offset_int", insertAtEnd);
else
return new llvm::PtrToIntInst(gep, LLVMTypes::Int64Type,
"offset_int", insertAtEnd);
}
const llvm::TargetData *td = GetTargetMachine()->getTargetData();
Assert(td != NULL);
LLVM_TYPE_CONST llvm::StructType *structType =
llvm::dyn_cast<LLVM_TYPE_CONST llvm::StructType>(type);
Assert(structType != NULL);
const llvm::StructLayout *sl = td->getStructLayout(structType);
Assert(sl != NULL);
uint64_t offset = sl->getElementOffset(element);
if (is32Bit || g->opt.force32BitAddressing)
return LLVMInt32((int32_t)offset);
else
return LLVMInt64(offset);
}
///////////////////////////////////////////////////////////////////////////
// Opt
Opt::Opt() {
level = 1;
fastMath = false;
fastMaskedVload = false;
force32BitAddressing = true;
unrollLoops = true;
disableAsserts = false;
disableMaskAllOnOptimizations = false;
disableHandlePseudoMemoryOps = false;
disableBlendedMaskedStores = false;
disableCoherentControlFlow = false;
disableUniformControlFlow = false;
disableGatherScatterOptimizations = false;
disableMaskedStoreToStore = false;
disableGatherScatterFlattening = false;
disableUniformMemoryOptimizations = false;
disableCoalescing = false;
}
///////////////////////////////////////////////////////////////////////////
// Globals
Globals::Globals() {
mathLib = Globals::Math_ISPC;
includeStdlib = true;
runCPP = true;
debugPrint = false;
disableWarnings = false;
warningsAsErrors = false;
quiet = false;
disableLineWrap = false;
emitPerfWarnings = true;
emitInstrumentation = false;
generateDebuggingSymbols = false;
enableFuzzTest = false;
fuzzTestSeed = -1;
mangleFunctionsWithTarget = false;
ctx = new llvm::LLVMContext;
#ifdef ISPC_IS_WINDOWS
_getcwd(currentDirectory, sizeof(currentDirectory));
#else
if (getcwd(currentDirectory, sizeof(currentDirectory)) == NULL)
FATAL("Current directory path too long!");
#endif
}
///////////////////////////////////////////////////////////////////////////
// SourcePos
SourcePos::SourcePos(const char *n, int fl, int fc, int ll, int lc) {
name = n;
if (name == NULL) {
if (m != NULL)
name = m->module->getModuleIdentifier().c_str();
else
name = "(unknown)";
}
first_line = fl;
first_column = fc;
last_line = ll != 0 ? ll : fl;
last_column = lc != 0 ? lc : fc;
}
llvm::DIFile
SourcePos::GetDIFile() const {
std::string directory, filename;
GetDirectoryAndFileName(g->currentDirectory, name, &directory, &filename);
return m->diBuilder->createFile(filename, directory);
}
void
SourcePos::Print() const {
printf(" @ [%s:%d.%d - %d.%d] ", name, first_line, first_column,
last_line, last_column);
}
bool
SourcePos::operator==(const SourcePos &p2) const {
return (!strcmp(name, p2.name) &&
first_line == p2.first_line &&
first_column == p2.first_column &&
last_line == p2.last_line &&
last_column == p2.last_column);
}
SourcePos
Union(const SourcePos &p1, const SourcePos &p2) {
if (strcmp(p1.name, p2.name) != 0)
return p1;
SourcePos ret;
ret.name = p1.name;
ret.first_line = std::min(p1.first_line, p2.first_line);
ret.first_column = std::min(p1.first_column, p2.first_column);
ret.last_line = std::max(p1.last_line, p2.last_line);
ret.last_column = std::max(p1.last_column, p2.last_column);
return ret;
}
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