[hsa merge 09/10] Majority of the HSA back-end

[Jakub Jelinek]

On Sat, Jan 16, 2016 at 09:58:51AM +0100, Jakub Jelinek wrote:
> IMHO you'd be best to write your own helpers for conversion to little
> endian (and back).
> gcc configure already has AC_C_BIGENDIAN (dunno how it handles pdp endian
> host though, so not sure if it is safe to rely on that), for recent GCC
> you can use __BYTE_ORDER__ macro to check endianity and __builtin_bswap*.
> So perhaps just
> #if GCC_VERSION >= 4006
> // use __BYTE_ORDER__ and __builtin_bswap or nothing
> #else
> // provide a safe slower default, with shifts and masking
> #endif

Note e.g. libiberty/simple-object* uses the slow version with shifts and
masking all the time, so just optimizing the case of recent GCC host (and
therefore also bootstrapped compilers) might be enough.

	Jakub