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Detect endianness without boost help

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This commit is contained in:
Paweł Bylica 2014-12-05 14:01:10 +01:00
parent b1765749f5
commit b07f25da4a
2 changed files with 17 additions and 18 deletions
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19
libevmjit/Endianness.cpp
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@ -12,12 +12,21 @@ namespace eth
namespace jit
{
llvm::Value* Endianness::bswap(llvm::IRBuilder<>& _builder, llvm::Value* _word)
llvm::Value* Endianness::bswapIfLE(llvm::IRBuilder<>& _builder, llvm::Value* _word)
{
// TODO: Native is Little Endian
assert(_word->getType() == Type::Word);
auto bswap = llvm::Intrinsic::getDeclaration(_builder.GetInsertBlock()->getParent()->getParent(), llvm::Intrinsic::bswap, Type::Word);
return _builder.CreateCall(bswap, _word);
union tester
{
unsigned int x;
unsigned char isLE;
};
if (tester{1}.isLE)
{
// OPT: Cache func declaration?
auto bswapFunc = llvm::Intrinsic::getDeclaration(_builder.GetInsertBlock()->getParent()->getParent(), llvm::Intrinsic::bswap, Type::Word);
return _builder.CreateCall(bswapFunc, _word);
}
return _word;
}
}

16
libevmjit/Endianness.h
View file

@ -1,8 +1,6 @@
#pragma once
#include <boost/detail/endian.hpp>
#include <llvm/IR/IRBuilder.h>
namespace dev
@ -14,19 +12,11 @@ namespace jit
struct Endianness
{
#if defined(BOOST_LITTLE_ENDIAN)
static llvm::Value* toBE(llvm::IRBuilder<>& _builder, llvm::Value* _word) { return bswap(_builder, _word); }
static llvm::Value* toNative(llvm::IRBuilder<>& _builder, llvm::Value* _word) { return bswap(_builder, _word); }
#elif defined(BOOST_BIG_ENDIAN)
static llvm::Value* toBE(llvm::IRBuilder<>&, llvm::Value* _word) { return _word; }
static llvm::Value* toNative(llvm::IRBuilder<>&, llvm::Value* _word) { return _word; }
#endif // Add support for PDP endianness if needed
static llvm::Value* toBE(llvm::IRBuilder<>& _builder, llvm::Value* _word) { return bswapIfLE(_builder, _word); }
static llvm::Value* toNative(llvm::IRBuilder<>& _builder, llvm::Value* _word) { return bswapIfLE(_builder, _word); }
private:
static llvm::Value* bswap(llvm::IRBuilder<>& _builder, llvm::Value* _word);
static llvm::Value* bswapIfLE(llvm::IRBuilder<>& _builder, llvm::Value* _word);
};
}