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| author | Salvatore Cro <salvatore.cro@st.com> | 2010-09-09 16:08:54 +0200 |
|---|---|---|
| committer | Carmelo Amoroso <carmelo.amoroso@st.com> | 2010-09-15 12:42:09 +0200 |
| commit | 599c74a4d7e9bbe68b946d65aef2725821ea3fe9 (patch) | |
| tree | 1eed7e5868ace26b9a08910fb36deaf95b513f99 /libpthread/nptl_db | |
| parent | 4b88e6e858b55def2ef0392278ddf81835f2ac45 (diff) | |
sh: move data without fetching cache block within the memset
With this patch the movca.l instruction is used within the memset.
The current memset implementation only uses the FPU and there is
an real gain for all the sizes.
Adding the movca.l instruction numbers always are better than the generic code.
There is a big gain for size greater than 64 KiB but number are worst for 4-32KiB
sizes compared with the implementation without movca.l.
Time Memory Bandwidth (Mbytes)
-------------------------------------------------
Generic SH4 SH4
(FPU) (FPU+movca.l)
-------------------------------------------------
512 1143 1998 1596
1 KiB 1273 2567 1915
2 KiB 1350 2993 2128
4-32KiB 1391 3262 2252
64KiB-16MiB 170 186 *830*
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Diffstat (limited to 'libpthread/nptl_db')
0 files changed, 0 insertions, 0 deletions