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Commit b65a75b8 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

MIPS: IP checksums: Optimize adjust of sum on buffers of odd alignment. 



Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 60724ca5

arch/mips/lib/csum_partial.S

+24 −11
Original line number Diff line number Diff line
@@ -270,13 +270,20 @@ LEAF(csum_partial) 
#endif



	/* odd buffer alignment? */

	beqz	t7, 1f

	 nop

	sll	v1, sum, 8

#ifdef CPU_MIPSR2

	wsbh	v1, sum

	movn	sum, v1, t7

#else

	beqz	t7, 1f			/* odd buffer alignment? */

	 lui	v1, 0x00ff

	addu	v1, 0x00ff

	and	t0, sum, v1

	sll	t0, t0, 8

	srl	sum, sum, 8

	or	sum, v1

	andi	sum, 0xffff

	and	sum, sum, v1

	or	sum, sum, t0

1:

#endif

	.set	reorder

	/* Add the passed partial csum.  */

	ADDC32(sum, a2)
@@ -663,14 +670,20 @@ EXC( sb t0, NBYTES-2(dst), .Ls_exc) 
	addu	sum, v1

#endif



	/* odd buffer alignment? */

	beqz	odd, 1f

	 nop

	sll	v1, sum, 8

#ifdef CPU_MIPSR2

	wsbh	v1, sum

	movn	sum, v1, odd

#else

	beqz	odd, 1f			/* odd buffer alignment? */

	 lui	v1, 0x00ff

	addu	v1, 0x00ff

	and	t0, sum, v1

	sll	t0, t0, 8

	srl	sum, sum, 8

	or	sum, v1

	andi	sum, 0xffff

	and	sum, sum, v1

	or	sum, sum, t0

1:

#endif

	.set reorder

	ADDC32(sum, psum)

	jr	ra