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ARCv2: memset: don't prefetch for len == 0 which happens a alot 

This avoids potential "bleeding" when size == 0 as cache line would be
dirtied (and possibly fetched from other cores) and due to the same
reaons more optimal too.

Signed-off-by: Vineet Gupta <vgupta@kernel.org>
This commit is contained in:
Vineet Gupta 2020-02-07 12:27:02 -08:00
parent c8ee610afe
commit 1918693ff1
1 changed files with 2 additions and 1 deletions
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3
arch/arc/lib/memset-archs.S
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@ -36,12 +36,13 @@
#endif
ENTRY_CFI(memset)
PREFETCHW_INSTR r0, 0 ; Prefetch the first write location
mov.f 0, r2
;;; if size is zero
jz.d [blink]
mov r3, r0 ; don't clobber ret val
PREFETCHW_INSTR r0, 0 ; Prefetch the first write location
;;; if length < 8
brls.d.nt r2, 8, .Lsmallchunk
mov.f lp_count,r2