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//===-- llvm/Target/TargetLibraryInfo.h - Library information ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETLIBRARYINFO_H
#define LLVM_TARGET_TARGETLIBRARYINFO_H
#include "llvm/Pass.h"
namespace llvm {
class Triple;
namespace LibFunc {
enum Func {
/// void *memset(void *b, int c, size_t len);
memset,
// void *memcpy(void *s1, const void *s2, size_t n);
memcpy,
/// void memset_pattern16(void *b, const void *pattern16, size_t len);
memset_pattern16,
NumLibFuncs
};
}
/// TargetLibraryInfo - This immutable pass captures information about what
/// library functions are available for the current target, and allows a
/// frontend to disable optimizations through -fno-builtin etc.
class TargetLibraryInfo : public ImmutablePass {
unsigned char AvailableArray[(LibFunc::NumLibFuncs+7)/8];
public:
static char ID;
TargetLibraryInfo();
TargetLibraryInfo(const Triple &T);
/// has - This function is used by optimizations that want to match on or form
/// a given library function.
bool has(LibFunc::Func F) const {
return (AvailableArray[F/8] & (1 << (F&7))) != 0;
}
/// setUnavailable - this can be used by whatever sets up TargetLibraryInfo to
/// ban use of specific library functions.
void setUnavailable(LibFunc::Func F) {
AvailableArray[F/8] &= ~(1 << (F&7));
}
void setAvailable(LibFunc::Func F) {
AvailableArray[F/8] |= 1 << (F&7);
}
};
} // end namespace llvm
#endif
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