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Commit 061273f9 authored by Sam Ravnborg's avatar Sam Ravnborg Committed by David S. Miller
Browse files

sparc64: update comments in U3memcpy 



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: default avatarSam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2f7043a3

arch/sparc/lib/U3memcpy.S

+21 −11
Original line number Diff line number Diff line
@@ -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