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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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4
lib/Support/FoldingSet.cpp
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@ -101,7 +101,7 @@ void FoldingSetNodeID::AddString(StringRef String) {
// Otherwise do it the hard way.
// To be compatible with above bulk transfer, we need to take endianness
// into account.
if (sys::isBigEndianHost()) {
if (sys::IsBigEndianHost) {
for (Pos += 4; Pos <= Size; Pos += 4) {
unsigned V = ((unsigned char)String[Pos - 4] << 24) |
((unsigned char)String[Pos - 3] << 16) |
@ -110,7 +110,7 @@ void FoldingSetNodeID::AddString(StringRef String) {
Bits.push_back(V);
}
} else {
assert(sys::isLittleEndianHost() && "Unexpected host endianness");
assert(sys::IsLittleEndianHost && "Unexpected host endianness");
for (Pos += 4; Pos <= Size; Pos += 4) {
unsigned V = ((unsigned char)String[Pos - 1] << 24) |
((unsigned char)String[Pos - 2] << 16) |