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Make the host endianness check an integer constant expression.

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I will remove the isBigEndianHost function once I update clang.

The ifdef logic is designed to
* not use configure/cmake to avoid breaking -arch i686 -arch ppc.
* default to little endian
* be as small as possible

It looks like sys/endian.h is the preferred header on most modern BSD systems,
but it is better to change this in a followup patch as machine/endian.h is
available on FreeBSD, OpenBSD, NetBSD and OS X.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179527 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2013-04-15 14:44:24 +00:00
parent 604b3573f9
commit 21a01d1ea8
8 changed files with 30 additions and 22 deletions
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6
lib/ExecutionEngine/ExecutionEngine.cpp
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@ -948,7 +948,7 @@ static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
const uint8_t *Src = (const uint8_t *)IntVal.getRawData();
if (sys::isLittleEndianHost()) {
if (sys::IsLittleEndianHost) {
// Little-endian host - the source is ordered from LSB to MSB. Order the
// destination from LSB to MSB: Do a straight copy.
memcpy(Dst, Src, StoreBytes);
@ -1009,7 +1009,7 @@ void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
break;
}
if (sys::isLittleEndianHost() != getDataLayout()->isLittleEndian())
if (sys::IsLittleEndianHost != getDataLayout()->isLittleEndian())
// Host and target are different endian - reverse the stored bytes.
std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
}
@ -1021,7 +1021,7 @@ static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
uint8_t *Dst = reinterpret_cast<uint8_t *>(
const_cast<uint64_t *>(IntVal.getRawData()));
if (sys::isLittleEndianHost())
if (sys::IsLittleEndianHost)
// Little-endian host - the destination must be ordered from LSB to MSB.
// The source is ordered from LSB to MSB: Do a straight copy.
memcpy(Dst, Src, LoadBytes);