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sparc64: update comments in U3memcpy

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Update comments about the range the different
parts of the code copies, the original comments were wrong.

Introduce a few descriptive labels too.

No functional changes.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2017-08-04 19:59:39 +02:00 committed by David S. Miller
parent 2f7043a377
commit 061273f9ec
1 changed files with 21 additions and 11 deletions
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32
arch/sparc/lib/U3memcpy.S
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@ -168,18 +168,25 @@ ENDPROC(U3_retl_o2_and_7_plus_GS_plus_8)
FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
srlx %o2, 31, %g2
cmp %g2, 0
/* software trap 5 "Range Check" if dst >= 0x80000000 */
tne %xcc, 5
PREAMBLE
mov %o0, %o4
/* if len == 0 */
cmp %o2, 0
be,pn %XCC, 85f
be,pn %XCC, end_return
or %o0, %o1, %o3
/* if len < 16 */
cmp %o2, 16
blu,a,pn %XCC, 80f
blu,a,pn %XCC, less_than_16
or %o3, %o2, %o3
/* if len < 192 */
cmp %o2, (3 * 64)
blu,pt %XCC, 70f
blu,pt %XCC, less_than_192
andcc %o3, 0x7, %g0
/* Clobbers o5/g1/g2/g3/g7/icc/xcc. We must preserve
@ -362,7 +369,7 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
cmp %o2, 0
add %o1, %g1, %o1
VISExitHalf
be,pn %XCC, 85f
be,pn %XCC, end_return
sub %o0, %o1, %o3
andcc %g1, 0x7, %g0
@ -392,14 +399,15 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
sub %o2, 2, %o2
1: andcc %o2, 0x1, %g0
be,pt %icc, 85f
be,pt %icc, end_return
nop
EX_LD(LOAD(ldub, %o1, %o5), U3_retl_o2)
ba,pt %xcc, 85f
ba,pt %xcc, end_return
EX_ST(STORE(stb, %o5, %o1 + %o3), U3_retl_o2)
.align 64
70: /* 16 < len <= 64 */
/* 16 <= len < 192 */
less_than_192:
bne,pn %XCC, 75f
sub %o0, %o1, %o3
@ -429,7 +437,7 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
EX_ST(STORE(stw, %o5, %o1 + %o3), U3_retl_o2_plus_4)
add %o1, 0x4, %o1
1: cmp %o2, 0
be,pt %XCC, 85f
be,pt %XCC, end_return
nop
ba,pt %xcc, 90f
nop
@ -475,13 +483,14 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
srl %g1, 3, %g1
andcc %o2, 0x7, %o2
be,pn %icc, 85f
be,pn %icc, end_return
add %o1, %g1, %o1
ba,pt %xcc, 90f
sub %o0, %o1, %o3
.align 64
80: /* 0 < len <= 16 */
/* 0 < len < 16 */
less_than_16:
andcc %o3, 0x3, %g0
bne,pn %XCC, 90f
sub %o0, %o1, %o3
@ -493,7 +502,8 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
bgu,pt %XCC, 1b
add %o1, 4, %o1
85: retl
end_return:
retl
mov EX_RETVAL(%o4), %o0
.align 32