tree 103a4dba75c4b111c829797304cb80cb3425d11f
parent 0f46c064eebc9c93b8f925416e0812cc7b4bb503
author Aurelien Jarno <aurelien@aurel32.net> 1348244426 +0200
committer Aurelien Jarno <aurelien@aurel32.net> 1348319420 +0200

tcg/mips: optimize bswap{16,16s,32} on MIPS32R2

bswap operations can be optimized on MIPS32 Release 2 using the ROTR,
WSBH and SEH instructions. We can't use the non-R2 code to implement the
ops due to registers constraints, so don't define the corresponding
TCG_TARGET_HAS_bswap* values.

Also bswap16* operations are supposed to be called with the 16 high bits
zeroed. This is the case everywhere (including for TCG by definition)
except when called from the store helper. Remove the AND instructions from
bswap16* and move it there.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>