| commit | 5c9ef58ec4bcb2def9e30f0b156f9cfcb1d0d163 | |
| author | Austin Foxley <austinf@cetoncorp.com> | |
| Sun, 22 Nov 2009 20:17:38 +0000 (22 12:17 -0800) | ||
| committer | Austin Foxley <austinf@cetoncorp.com> | |
| Sun, 22 Nov 2009 20:17:38 +0000 (22 12:17 -0800) | ||
| tree | f8f889678b653d5275c285a037b9b43f27a91192 | treesnapshot (tar.gz zip) |
| parent | f757db2d319ccc5f7034165046fb2bb58901afb1 | commitdiff |
sh: Add new optimisation to the SH4 memcpy
This optimization is based on prefetching and 64bit data transfer via FPU
(only for the little endianess)
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: Austin Foxley <austinf@cetoncorp.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
This optimization is based on prefetching and 64bit data transfer via FPU
(only for the little endianess)
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: Austin Foxley <austinf@cetoncorp.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
| libc/string/Makefile.in | diffblobblamehistory | |
| libc/string/sh/memchr.S | [new file with mode: 0644] | blob |
| libc/string/sh/sh4/memcpy.S | diffblobblamehistory | |
| libc/string/sh/sh4/memmove.c | [new file with mode: 0644] | blob |
| libc/string/sh/sh4/memset.S | [new file with mode: 0644] | blob |
| libc/string/sh/sh4/strcpy.S | [new file with mode: 0644] | blob |
| libc/string/sh/sh4/strncpy.S | [new file with mode: 0644] | blob |
| libc/string/sh/strlen.S | [new file with mode: 0644] | blob |