diff options
| author | Claudiu Zissulescu <claziss@synopsys.com> | 2016-04-26 16:25:06 +0300 |
|---|---|---|
| committer | Corinna Vinschen <corinna@vinschen.de> | 2016-08-11 11:59:53 +0300 |
| commit | 67c5af5b85505081aeaed17a1f8a96b2c3900c70 (patch) | |
| tree | 3de72fb3c9c044f249d8275242fc07405d421ba7 /newlib/libc/machine | |
| parent | 9a80679aae9098aa189f7ea8ce7892e2c092f3be (diff) | |
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.
Diffstat (limited to 'newlib/libc/machine')
| -rw-r--r-- | newlib/libc/machine/arc/memcpy-archs.S | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/newlib/libc/machine/arc/memcpy-archs.S b/newlib/libc/machine/arc/memcpy-archs.S index 2673cee98..84e766ad8 100644 --- a/newlib/libc/machine/arc/memcpy-archs.S +++ b/newlib/libc/machine/arc/memcpy-archs.S @@ -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 */ |