tree b2ae2e51d576be0a351cc65cb84848e3093f14e6
parent a0102082de4026833afbd2525e8a6320d1f92885
author Aurelien Jarno <aurelien@aurel32.net> 1302734969 +0200
committer Aurelien Jarno <aurelien@aurel32.net> 1303065134 +0200

softfloat: use GCC builtins to count the leading zeros

Softfloat has its own implementation to count the leading zeros. However
a lot of architectures have either a dedicated instruction or an
optimized to do that. When using GCC >= 3.4, this patch uses GCC builtins
instead of the handcoded implementation.

Note that I amware that QEMU_GNUC_PREREQ is defined in osdep.h and that
clz32() and clz64() are defined in host-utils.h, but I think it is better
to keep the softfloat implementation self contained.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>