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arc: Use unaligned loads/stores for memcopy. 

newlib/
2016-04-26  Claudiu Zissulescu  <claziss@synopsys.com>

	* libc/machine/arc/memcpy-archs.S: Add and enable memcpy using
	unaligned loads/stores.
This commit is contained in:
Claudiu Zissulescu 2016-04-26 15:25:06 +02:00 committed by Corinna Vinschen
parent 9a80679aae
commit 67c5af5b85
1 changed files with 59 additions and 0 deletions
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59
newlib/libc/machine/arc/memcpy-archs.S
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@ -69,6 +69,7 @@
# define ZOLAND 0xF
#endif
#ifdef __ARC_ALIGNED_ACCESS__
ENTRY (memcpy)
prefetch [r1] ; Prefetch the read location
prefetchw [r0] ; Prefetch the write location
@ -263,6 +264,64 @@ ENTRY (memcpy)
j [blink]
ENDFUNC (memcpy)
#else
ENTRY(memcpy)
prefetch [r1] ; Prefetch the read location
prefetchw [r0] ; Prefetch the write location
mov.f 0, r2
;;; if size is zero
jz.d [blink]
mov r3, r0 ; don't clobber ret val
;;; if size <= 8
cmp r2, 8
bls.d @.Lsmallchunk
mov.f lp_count, r2
;;; Convert len to Dwords, unfold x4
lsr.f lp_count, r2, ZOLSHFT
lpnz @.Lcopyfast
;; LOOP START
LOADX (r6, r1)
PREFETCH_READ (r1)
PREFETCH_WRITE (r3)
LOADX (r8, r1)
LOADX (r10, r1)
LOADX (r4, r1)
STOREX (r6, r3)
STOREX (r8, r3)
STOREX (r10, r3)
STOREX (r4, r3)
.Lcopyfast:
#ifdef __ARC_LL64__
and r2, r2, ZOLAND ;Remaining 31 bytes
lsr.f lp_count, r2, 3 ;Convert to 64-bit words.
lpnz @.Lcopy64b
;; LOOP START
ldd.ab r6,[r1,8]
std.ab r6,[r3,8]
.Lcopy64b:
and.f lp_count, r2, 0x07 ; Last 7 bytes
#else
and.f lp_count, r2, ZOLAND
#endif
.Lsmallchunk:
lpnz @.Lcopyremainingbytes
;; LOOP START
ldb.ab r5, [r1,1]
stb.ab r5, [r3,1]
.Lcopyremainingbytes:
j [blink]
ENDFUNC(memcpy)
#endif
#endif /* __ARCHS__ */
#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */