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* libc/machine/mips/memset.S: Add support for mips32r6/mips64r6.

This commit is contained in:
Steve Ellcey 2015-03-03 19:49:00 +00:00
parent b8cd02f65a
commit bc860c9894
2 changed files with 62 additions and 0 deletions
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4
newlib/ChangeLog
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@ -1,3 +1,7 @@
2015-03-03 Steve Ellcey <sellcey@imgtec.com>
* libc/machine/mips/memset.S: Add support for mips32r6/mips64r6.
2015-03-03 Steve Ellcey <sellcey@imgtec.com>
* libc/machine/mips/memcpy.S: Add support for mips32r6/mips64r6.

58
newlib/libc/machine/mips/memset.S
View File

@ -84,6 +84,15 @@
# endif
#endif
/* New R6 instructions that may not be in asm.h. */
#ifndef PTR_LSA
# if _MIPS_SIM == _ABI64
# define PTR_LSA dlsa
# else
# define PTR_LSA lsa
# endif
#endif
/* Using PREFETCH_HINT_PREPAREFORSTORE instead of PREFETCH_STORE
or PREFETCH_STORE_STREAMED offers a large performance advantage
but PREPAREFORSTORE has some special restrictions to consider.
@ -154,6 +163,14 @@
# define PREFETCH_FOR_STORE(offset, reg)
#endif
#if __mips_isa_rev > 5
# if (PREFETCH_STORE_HINT == PREFETCH_HINT_PREPAREFORSTORE)
# undef PREFETCH_STORE_HINT
# define PREFETCH_STORE_HINT PREFETCH_HINT_STORE_STREAMED
# endif
# define R6_CODE
#endif
/* Allow the routine to be named something else if desired. */
#ifndef MEMSET_NAME
# define MEMSET_NAME memset
@ -243,11 +260,48 @@ LEAF(MEMSET_NAME)
/* If the destination address is not aligned do a partial store to get it
aligned. If it is already aligned just jump to L(aligned). */
L(set0):
#ifndef R6_CODE
andi t2,a3,(NSIZE-1) /* word-unaligned address? */
beq t2,zero,L(aligned) /* t2 is the unalignment count */
PTR_SUBU a2,a2,t2
C_STHI a1,0(a0)
PTR_ADDU a0,a0,t2
#else /* R6_CODE */
andi t2,a0,(NSIZE-1)
lapc t9,L(atable)
PTR_LSA t9,t2,t9,2
jrc t9
L(atable):
bc L(aligned)
# ifdef USE_DOUBLE
bc L(lb7)
bc L(lb6)
bc L(lb5)
bc L(lb4)
# endif
bc L(lb3)
bc L(lb2)
bc L(lb1)
L(lb7):
sb a1,6(a0)
L(lb6):
sb a1,5(a0)
L(lb5):
sb a1,4(a0)
L(lb4):
sb a1,3(a0)
L(lb3):
sb a1,2(a0)
L(lb2):
sb a1,1(a0)
L(lb1):
sb a1,0(a0)
li t9,NSIZE
subu t2,t9,t2
PTR_SUBU a2,a2,t2
PTR_ADDU a0,a0,t2
#endif /* R6_CODE */
L(aligned):
/* If USE_DOUBLE is not set we may still want to align the data on a 16
@ -298,8 +352,12 @@ L(loop16w):
bgtz v1,L(skip_pref)
nop
#endif
#ifndef R6_CODE
PREFETCH_FOR_STORE (4, a0)
PREFETCH_FOR_STORE (5, a0)
#else
PREFETCH_FOR_STORE (2, a0)
#endif
L(skip_pref):
C_ST a1,UNIT(0)(a0)
C_ST a1,UNIT(1)(a0)