mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-13 20:32:21 +00:00
This new class provides support for platform specific "features". The intent
is to manage processor specific attributes from the command line. See examples of use in llc/lli and PowerPCTargetSubtarget. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23191 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
75592e4137
commit
b3302db18a
145
include/llvm/Target/SubtargetFeature.h
Normal file
145
include/llvm/Target/SubtargetFeature.h
Normal file
@ -0,0 +1,145 @@
|
||||
//===-- llvm/Target/SubtargetFeature.h - CPU characteristics ----*- C++ -*-===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file was developed by Jim Laskey and is distributed under the
|
||||
// University of Illinois Open Source License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This file defines and manages user or tool specified CPU characteristics.
|
||||
// The intent is to be able to package specific features that should or should
|
||||
// not be used on a specific target processor. A tool, such as llc, could, as
|
||||
// as example, gather chip info from the command line, a long with features
|
||||
// that should be used on that chip.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#ifndef LLVM_TARGET_SUBTARGETFEATURE_H
|
||||
#define LLVM_TARGET_SUBTARGETFEATURE_H
|
||||
|
||||
|
||||
#include <string>
|
||||
#include <vector>
|
||||
#include <iostream>
|
||||
#include <cassert>
|
||||
|
||||
namespace llvm {
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
///
|
||||
/// SubtargetFeatureKV - Used to provide key value pairs for feature and
|
||||
/// CPU bit flags.
|
||||
//
|
||||
struct SubtargetFeatureKV {
|
||||
const char *Key; // K-V key string
|
||||
uint32_t Value; // K-V integer value
|
||||
|
||||
// Compare routine for std binary search
|
||||
bool operator<(const std::string &S) const {
|
||||
return strcmp(Key, S.c_str()) < 0;
|
||||
}
|
||||
};
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
///
|
||||
/// SubtargetFeatures - Manages the enabling and disabling of subtarget
|
||||
/// specific features. Features are encoded as a string of the form
|
||||
/// "cpu,+attr1,+attr2,-attr3,...,+attrN"
|
||||
/// A comma separates each feature from the next (all lowercase.)
|
||||
/// The first feature is always the CPU subtype (eg. pentiumm). If the CPU
|
||||
/// value is "generic" then the CPU subtype should be generic for the target.
|
||||
/// Each of the remaining features is prefixed with + or - indicating whether
|
||||
/// that feature should be enabled or disabled contrary to the cpu
|
||||
/// specification.
|
||||
///
|
||||
|
||||
class SubtargetFeatures {
|
||||
private:
|
||||
std::vector<std::string> Features; // Subtarget features as a vector
|
||||
|
||||
// Determine if a feature has a flag; '+' or '-'
|
||||
static inline bool hasFlag(const std::string &Feature) {
|
||||
assert(!Feature.empty() && "Empty string");
|
||||
// Get first character
|
||||
char Ch = Feature[0];
|
||||
// Check if first character is '+' or '-' flag
|
||||
return Ch == '+' || Ch =='-';
|
||||
}
|
||||
|
||||
// Return true if enable flag; '+'.
|
||||
static inline bool isEnabled(const std::string &Feature) {
|
||||
assert(!Feature.empty() && "Empty string");
|
||||
// Get first character
|
||||
char Ch = Feature[0];
|
||||
// Check if first character is '+' for enabled
|
||||
return Ch == '+';
|
||||
}
|
||||
|
||||
// Return a string with a prepended flag; '+' or '-'.
|
||||
static inline std::string PrependFlag(const std::string &Feature,
|
||||
bool IsEnabled) {
|
||||
assert(!Feature.empty() && "Empty string");
|
||||
if (hasFlag(Feature)) return Feature;
|
||||
return std::string(IsEnabled ? "+" : "-") + Feature;
|
||||
}
|
||||
|
||||
// Return string stripped of flag.
|
||||
static inline std::string StripFlag(const std::string &Feature) {
|
||||
return hasFlag(Feature) ? Feature.substr(1) : Feature;
|
||||
}
|
||||
|
||||
/// Splits a string of comma separated items in to a vector of strings.
|
||||
static void Split(std::vector<std::string> &V, const std::string &S);
|
||||
|
||||
/// Join a vector of strings into a string with a comma separating each
|
||||
/// item.
|
||||
static std::string Join(const std::vector<std::string> &V);
|
||||
|
||||
/// Convert a string to lowercase.
|
||||
static std::string toLower(const std::string &S);
|
||||
|
||||
/// Find item in array using binary search.
|
||||
static const SubtargetFeatureKV *Find(const std::string &S,
|
||||
const SubtargetFeatureKV *A, size_t L);
|
||||
|
||||
public:
|
||||
/// Ctor.
|
||||
SubtargetFeatures(const std::string Initial = std::string()) {
|
||||
// Break up string into separate features
|
||||
Split(Features, Initial);
|
||||
}
|
||||
|
||||
/// Features string accessors.
|
||||
inline std::string getString() const { return Join(Features); }
|
||||
void setString(const std::string &Initial) {
|
||||
// Throw out old features
|
||||
Features.clear();
|
||||
// Break up string into separate features
|
||||
Split(Features, toLower(Initial));
|
||||
}
|
||||
|
||||
/// Setting CPU string. Replaces previous setting. Setting to "" clears CPU.
|
||||
void setCPU(std::string String) { Features[0] = toLower(String); }
|
||||
|
||||
/// Adding Features.
|
||||
void AddFeature(const std::string &String, bool IsEnabled = true);
|
||||
|
||||
/// Parse feature string for quick usage.
|
||||
static uint32_t Parse(const std::string &String,
|
||||
const std::string &DefaultCPU,
|
||||
const SubtargetFeatureKV *CPUTable,
|
||||
size_t CPUTableSize,
|
||||
const SubtargetFeatureKV *FeatureTable,
|
||||
size_t FeatureTableSize);
|
||||
|
||||
/// Print feature string.
|
||||
void print(std::ostream &OS) const;
|
||||
|
||||
// Dump feature info.
|
||||
void dump() const;
|
||||
};
|
||||
|
||||
} // End namespace llvm
|
||||
|
||||
#endif
|
173
lib/Target/SubtargetFeature.cpp
Normal file
173
lib/Target/SubtargetFeature.cpp
Normal file
@ -0,0 +1,173 @@
|
||||
//===- SubtargetFeature.cpp - CPU characteristics Implementation ----------===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file was developed by Jim Laskey and is distributed under the
|
||||
// University of Illinois Open Source License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This file implements the SubtargetFeature interface.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "llvm/Target/SubtargetFeature.h"
|
||||
|
||||
#include <string>
|
||||
#include <algorithm>
|
||||
#include <vector>
|
||||
#include <cassert>
|
||||
|
||||
|
||||
using namespace llvm;
|
||||
|
||||
/// Splits a string of comma separated items in to a vector of strings.
|
||||
void SubtargetFeatures::Split(std::vector<std::string> &V,
|
||||
const std::string &S) {
|
||||
// Start at beginning of string.
|
||||
size_t Pos = 0;
|
||||
while (true) {
|
||||
// Find the next comma
|
||||
size_t Comma = S.find(',', Pos);
|
||||
// If no comma found then the the rest of the string is used
|
||||
if (Comma == std::string::npos) {
|
||||
// Add string to vector
|
||||
V.push_back(S.substr(Pos));
|
||||
break;
|
||||
}
|
||||
// Otherwise add substring to vector
|
||||
V.push_back(S.substr(Pos, Comma - Pos));
|
||||
// Advance to next item
|
||||
Pos = Comma + 1;
|
||||
}
|
||||
}
|
||||
|
||||
/// Join a vector of strings to a string with a comma separating each element.
|
||||
std::string SubtargetFeatures::Join(const std::vector<std::string> &V) {
|
||||
// Start with empty string.
|
||||
std::string Result;
|
||||
// If the vector is not empty
|
||||
if (!V.empty()) {
|
||||
// Start with the CPU feature
|
||||
Result = V[0];
|
||||
// For each successive feature
|
||||
for (size_t i = 1; i < V.size(); i++) {
|
||||
// Add a comma
|
||||
Result += ",";
|
||||
// Add the feature
|
||||
Result += V[i];
|
||||
}
|
||||
}
|
||||
// Return the features string
|
||||
return Result;
|
||||
}
|
||||
|
||||
/// Convert a string to lowercase.
|
||||
std::string SubtargetFeatures::toLower(const std::string &S) {
|
||||
// Copy the string
|
||||
std::string Result = S;
|
||||
// For each character in string
|
||||
for (size_t i = 0; i < Result.size(); i++) {
|
||||
// Convert character to lowercase
|
||||
Result[i] = std::tolower(Result[i]);
|
||||
}
|
||||
// Return the lowercased string
|
||||
return Result;
|
||||
}
|
||||
|
||||
/// Adding features.
|
||||
void SubtargetFeatures::AddFeature(const std::string &String,
|
||||
bool IsEnabled) {
|
||||
// Don't add empty features
|
||||
if (!String.empty()) {
|
||||
// Convert to lowercase, prepend flag and add to vector
|
||||
Features.push_back(PrependFlag(toLower(String), IsEnabled));
|
||||
}
|
||||
}
|
||||
|
||||
/// Find item in array using binary search.
|
||||
const SubtargetFeatureKV *
|
||||
SubtargetFeatures::Find(const std::string &S,
|
||||
const SubtargetFeatureKV *A, size_t L) {
|
||||
// Determine the end of the array
|
||||
const SubtargetFeatureKV *Hi = A + L;
|
||||
// Binary search the array
|
||||
const SubtargetFeatureKV *F = std::lower_bound(A, Hi, S);
|
||||
// If not found then return NULL
|
||||
if (F == Hi || std::string(F->Key) != S) return NULL;
|
||||
// Return the found array item
|
||||
return F;
|
||||
}
|
||||
|
||||
/// Parse feature string for quick usage.
|
||||
uint32_t SubtargetFeatures::Parse(const std::string &String,
|
||||
const std::string &DefaultCPU,
|
||||
const SubtargetFeatureKV *CPUTable,
|
||||
size_t CPUTableSize,
|
||||
const SubtargetFeatureKV *FeatureTable,
|
||||
size_t FeatureTableSize) {
|
||||
assert(CPUTable && "missing CPU table");
|
||||
assert(FeatureTable && "missing features table");
|
||||
#ifndef NDEBUG
|
||||
for (size_t i = 1; i < CPUTableSize; i++) {
|
||||
assert(strcmp(CPUTable[i - 1].Key, CPUTable[i].Key) < 0 &&
|
||||
"CPU table is not sorted");
|
||||
}
|
||||
for (size_t i = 1; i < FeatureTableSize; i++) {
|
||||
assert(strcmp(FeatureTable[i - 1].Key, FeatureTable[i].Key) < 0 &&
|
||||
"CPU features table is not sorted");
|
||||
}
|
||||
#endif
|
||||
std::vector<std::string> Features; // Subtarget features as a vector
|
||||
uint32_t Bits = 0; // Resulting bits
|
||||
// Split up features
|
||||
Split(Features, String);
|
||||
// Check if default is needed
|
||||
if (Features[0].empty()) Features[0] = DefaultCPU;
|
||||
// Find CPU entry
|
||||
const SubtargetFeatureKV *CPUEntry =
|
||||
Find(Features[0], CPUTable, CPUTableSize);
|
||||
// If there is a match
|
||||
if (CPUEntry) {
|
||||
// Set base feature bits
|
||||
Bits = CPUEntry->Value;
|
||||
} else {
|
||||
std::cerr << Features[0]
|
||||
<< " is not a recognized processor for this target"
|
||||
<< " (ignoring processor)"
|
||||
<< "\n";
|
||||
}
|
||||
// Iterate through each feature
|
||||
for (size_t i = 1; i < Features.size(); i++) {
|
||||
// Get next feature
|
||||
const std::string &Feature = Features[i];
|
||||
// Find feature in table.
|
||||
const SubtargetFeatureKV *FeatureEntry =
|
||||
Find(StripFlag(Feature), FeatureTable, FeatureTableSize);
|
||||
// If there is a match
|
||||
if (FeatureEntry) {
|
||||
// Enable/disable feature in bits
|
||||
if (isEnabled(Feature)) Bits |= FeatureEntry->Value;
|
||||
else Bits &= ~FeatureEntry->Value;
|
||||
} else {
|
||||
std::cerr << Feature
|
||||
<< " is not a recognized feature for this target"
|
||||
<< " (ignoring feature)"
|
||||
<< "\n";
|
||||
}
|
||||
}
|
||||
return Bits;
|
||||
}
|
||||
|
||||
/// Print feature string.
|
||||
void SubtargetFeatures::print(std::ostream &OS) const {
|
||||
for (size_t i = 0; i < Features.size(); i++) {
|
||||
OS << Features[i] << " ";
|
||||
}
|
||||
OS << "\n";
|
||||
}
|
||||
|
||||
/// Dump feature info.
|
||||
void SubtargetFeatures::dump() const {
|
||||
print(std::cerr);
|
||||
}
|
Loading…
Reference in New Issue
Block a user