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Modify prefetch for krait memcpy.

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I originally modified the krait mainloop prefetch from cacheline * 8 to * 2.
This causes a perf degradation for copies bigger than will fit in the cache.
Fixing this back to the original * 8. I tried other multiples, but * 8 is th
sweet spot on krait.

Bug: 11221806

Change-Id: I1f75fad6440f7417e664795a6e7b5616f6a29c45
This commit is contained in:
Christopher Ferris 2013-10-15 12:10:06 -07:00
parent abeafbd6d5
commit c3c58fb560
1 changed files with 1 additions and 1 deletions
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2
libc/arch-arm/krait/bionic/memcpy_base.S
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@ -79,7 +79,7 @@ ENTRY_PRIVATE(MEMCPY_BASE)
1: /* The main loop copies 64 bytes at a time */ 1: /* The main loop copies 64 bytes at a time */
vld1.8 {d0 - d3}, [r1]! vld1.8 {d0 - d3}, [r1]!
vld1.8 {d4 - d7}, [r1]! vld1.8 {d4 - d7}, [r1]!
pld [r1, #(32*2)] pld [r1, #(32*8)]
subs r2, r2, #64 subs r2, r2, #64
vst1.8 {d0 - d3}, [r0, :128]! vst1.8 {d0 - d3}, [r0, :128]!
vst1.8 {d4 - d7}, [r0, :128]! vst1.8 {d4 - d7}, [r0, :128]!