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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)
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Generic SH4 SH4
(FPU) (FPU+movca.l)
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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>
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This patch disables SH-4 optimizations that rely on the FPU when
building for variants that don't have an FPU, such as SH-4AL.
Signed-off-by: Andrew Stubbs <ams@codesourcery.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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This optimization is based on prefetching and 64bit data transfer via FPU
(only for the little endianess)
Tests shows that:
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Memory bandwidth | Gain
| sh4-300 | sh4-200
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512 bytes to 16KiB | ~20% | ~25%
from 32KiB to 16MiB | ~190% | ~5%
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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>
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