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authorSalvatore Cro <salvatore.cro@st.com>2010-09-09 16:10:21 +0200
committerCarmelo Amoroso <carmelo.amoroso@st.com>2010-09-15 12:51:04 +0200
commita27dd6924e7964d92b49f4d5ebe2e68cfb2742dd (patch)
tree627befce36a43bffdb02bacca575a2c01256fd7a /libc/signal
parent599c74a4d7e9bbe68b946d65aef2725821ea3fe9 (diff)
sh: update the memcpy adding a new loop with aggressive prefetching
After exploring different prefetch distance-degree combinations in this new update of the memcpy function, a new loop has been added for moving many cache lines with an aggressive prefetching schema. Prefetch has been removed when move few cache line aligned blocks. As final result, this memcpy gives us the same performances for small sizes (we already had!) and better numbers for big copies. In case of SH4-300 CPU Series, benchmarks show a gain of ~20% for sizes from 4KiB to 256KiB. In case of the SH4-200, there is a gain of ~40% for sizes bigger than 32KiB. Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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