From 007d77d0c5eb36555443ff273ce2a27f90da8837 Mon Sep 17 00:00:00 2001 From: "Chen, Kenneth W" Date: Fri, 10 Nov 2006 13:17:50 -0800 Subject: [IA64] implement csum_ipv6_magic for ia64. The asm version is 4.4 times faster than the generic C version and 10X smaller in code size. Signed-off-by: Ken Chen Signed-off-by: Tony Luck --- arch/ia64/lib/ip_fast_csum.S | 55 ++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 53 insertions(+), 2 deletions(-) (limited to 'arch/ia64/lib') diff --git a/arch/ia64/lib/ip_fast_csum.S b/arch/ia64/lib/ip_fast_csum.S index 19674ca2acfc..4fb132ee207a 100644 --- a/arch/ia64/lib/ip_fast_csum.S +++ b/arch/ia64/lib/ip_fast_csum.S @@ -8,8 +8,8 @@ * in0: address of buffer to checksum (char *) * in1: length of the buffer (int) * - * Copyright (C) 2002 Intel Corp. - * Copyright (C) 2002 Ken Chen + * Copyright (C) 2002, 2006 Intel Corp. + * Copyright (C) 2002, 2006 Ken Chen */ #include @@ -25,6 +25,9 @@ #define in0 r32 #define in1 r33 +#define in2 r34 +#define in3 r35 +#define in4 r36 #define ret0 r8 GLOBAL_ENTRY(ip_fast_csum) @@ -88,3 +91,51 @@ GLOBAL_ENTRY(ip_fast_csum) mov b0=r34 br.ret.sptk.many b0 END(ip_fast_csum) + +GLOBAL_ENTRY(csum_ipv6_magic) + ld4 r20=[in0],4 + ld4 r21=[in1],4 + dep r15=in3,in2,32,16 + ;; + ld4 r22=[in0],4 + ld4 r23=[in1],4 + mux1 r15=r15,@rev + ;; + ld4 r24=[in0],4 + ld4 r25=[in1],4 + shr.u r15=r15,16 + add r16=r20,r21 + add r17=r22,r23 + ;; + ld4 r26=[in0],4 + ld4 r27=[in1],4 + add r18=r24,r25 + add r8=r16,r17 + ;; + add r19=r26,r27 + add r8=r8,r18 + ;; + add r8=r8,r19 + add r15=r15,in4 + ;; + add r8=r8,r15 + ;; + shr.u r10=r8,32 // now fold sum into short + zxt4 r11=r8 + ;; + add r8=r10,r11 + ;; + shr.u r10=r8,16 // yeah, keep it rolling + zxt2 r11=r8 + ;; + add r8=r10,r11 + ;; + shr.u r10=r8,16 // three times lucky + zxt2 r11=r8 + ;; + add r8=r10,r11 + mov r9=0xffff + ;; + andcm r8=r9,r8 + br.ret.sptk.many b0 +END(csum_ipv6_magic) -- cgit v1.2.1