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2009-12-14sh: fix endianess and optimise the SH4 memcpyGiuseppe Cavallaro
This patch fixes the big-endian code and adds a new optimization only for little endian mode. This optimization is based on prefetching and 64bit data transfer via FPU. Tests shows that ---------------------------------------- Memory bandwidth | Gain | sh4-300 | sh4-200 ---------------------------------------- 512 bytes to 16KiB | ~20% | ~25% from 32KiB to 16MiB | ~190% | ~5% ---------------------------------------- Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2009-07-14sh: Fix up optimized SH-4 memcpy on big endian.Giuseppe Cavallaro
Signed-off-by: Hideo Saito <saito@densan.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> See Linux Kernel commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e08b954c9a140f2062649faec72514eb505f18c3 Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2008-09-09Add optimized memcpy implementation for sh4 (from Stuart Menefy ↵Carmelo Amoroso
@STMicroelectronics). This implementation is based on 'backward copying'. Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>