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Date: Mon, 12 Apr 2010 15:40:09 -0500 From: "Steven J. Magnani" <steve@...idescorp.com> To: microblaze-uclinux@...e.uq.edu.au Cc: monstr@...str.eu, linux-kernel@...r.kernel.org, "Steven J. Magnani" <steve@...idescorp.com> Subject: [PATCH] microblaze: speedup for word-aligned memcpys memcpy performance was measured on a noMMU system having a barrel shifter, 4K caches, and 32-byte write-through cachelines. In this environment, copying word-aligned data in word-sized chunks appears to be about 3% more efficient on packet-sized buffers (1460 bytes) than copying in cacheline-sized chunks. Skip to word-based copying when buffers are both word-aligned. Signed-off-by: Steven J. Magnani <steve@...idescorp.com> --- diff -uprN a/arch/microblaze/lib/fastcopy.S b/arch/microblaze/lib/fastcopy.S --- a/arch/microblaze/lib/fastcopy.S 2010-04-09 21:52:36.000000000 -0500 +++ b/arch/microblaze/lib/fastcopy.S 2010-04-12 15:37:44.000000000 -0500 @@ -69,37 +69,13 @@ a_dalign_done: blti r4, a_block_done a_block_xfer: - andi r4, r7, 0xffffffe0 /* n = c & ~31 */ - rsub r7, r4, r7 /* c = c - n */ - andi r9, r6, 3 /* t1 = s & 3 */ - /* if temp != 0, unaligned transfers needed */ - bnei r9, a_block_unaligned - -a_block_aligned: - lwi r9, r6, 0 /* t1 = *(s + 0) */ - lwi r10, r6, 4 /* t2 = *(s + 4) */ - lwi r11, r6, 8 /* t3 = *(s + 8) */ - lwi r12, r6, 12 /* t4 = *(s + 12) */ - swi r9, r5, 0 /* *(d + 0) = t1 */ - swi r10, r5, 4 /* *(d + 4) = t2 */ - swi r11, r5, 8 /* *(d + 8) = t3 */ - swi r12, r5, 12 /* *(d + 12) = t4 */ - lwi r9, r6, 16 /* t1 = *(s + 16) */ - lwi r10, r6, 20 /* t2 = *(s + 20) */ - lwi r11, r6, 24 /* t3 = *(s + 24) */ - lwi r12, r6, 28 /* t4 = *(s + 28) */ - swi r9, r5, 16 /* *(d + 16) = t1 */ - swi r10, r5, 20 /* *(d + 20) = t2 */ - swi r11, r5, 24 /* *(d + 24) = t3 */ - swi r12, r5, 28 /* *(d + 28) = t4 */ - addi r6, r6, 32 /* s = s + 32 */ - addi r4, r4, -32 /* n = n - 32 */ - bneid r4, a_block_aligned /* while (n) loop */ - addi r5, r5, 32 /* d = d + 32 (IN DELAY SLOT) */ - bri a_block_done + /* if temp == 0, everything is word-aligned */ + beqi r9, a_word_xfer a_block_unaligned: + andi r4, r7, 0xffffffe0 /* n = c & ~31 */ + rsub r7, r4, r7 /* c = c - n */ andi r8, r6, 0xfffffffc /* as = s & ~3 */ add r6, r6, r4 /* s = s + n */ lwi r11, r8, 0 /* h = *(as + 0) */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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