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authorChen, Kenneth W <kenneth.w.chen@intel.com>2006-11-10 13:17:50 -0800
committerTony Luck <tony.luck@intel.com>2006-12-07 11:17:26 -0800
commit007d77d0c5eb36555443ff273ce2a27f90da8837 (patch)
tree6d85a48be575cc8cda1bef7b7aa360ac8bcebde7 /arch/ia64/lib
parent5b4d5681ffaa6e1bf3b085beb701d87c7c7404da (diff)
downloadlinux-007d77d0c5eb36555443ff273ce2a27f90da8837.tar.bz2
[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 <kenneth.w.chen@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/lib')
-rw-r--r--arch/ia64/lib/ip_fast_csum.S55
1 files changed, 53 insertions, 2 deletions
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 <kenneth.w.chen@intel.com>
+ * Copyright (C) 2002, 2006 Intel Corp.
+ * Copyright (C) 2002, 2006 Ken Chen <kenneth.w.chen@intel.com>
*/
#include <asm/asmmacro.h>
@@ -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)