Title: [6009] trunk/arch/blackfin/include/asm/checksum.h: Faster Implementation of csum_tcpudp_nofold()
- Revision
- 6009
- Author
- hennerich
- Date
- 2009-01-13 08:06:56 -0600 (Tue, 13 Jan 2009)
Log Message
Faster Implementation of csum_tcpudp_nofold()
Avoid conditional branch instructions during carry bit additions.
Special thanks to Bernd.
Simplify: Use ((len + proto) << 8) like every other __LITTLE_ENDIAN__
machine
Modified Paths
Diff
Modified: trunk/arch/blackfin/include/asm/checksum.h (6008 => 6009)
--- trunk/arch/blackfin/include/asm/checksum.h 2009-01-13 12:57:33 UTC (rev 6008)
+++ trunk/arch/blackfin/include/asm/checksum.h 2009-01-13 14:06:56 UTC (rev 6009)
@@ -63,23 +63,22 @@
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, __wsum sum)
{
+ unsigned int carry;
- __asm__ ("%0 = %0 + %1;\n\t"
- "CC = AC0;\n\t"
- "if !CC jump 4;\n\t"
- "%0 = %0 + %4;\n\t"
- "%0 = %0 + %2;\n\t"
- "CC = AC0;\n\t"
- "if !CC jump 4;\n\t"
- "%0 = %0 + %4;\n\t"
- "%0 = %0 + %3;\n\t"
- "CC = AC0;\n\t"
- "if !CC jump 4;\n\t"
- "%0 = %0 + %4;\n\t"
- "NOP;\n\t"
- : "=d" (sum)
- : "d" (daddr), "d" (saddr), "d" ((ntohs(len)<<16)+proto*256), "d" (1), "0"(sum)
- : "CC");
+ __asm__ ("%0 = %0 + %2;\n\t"
+ "CC = AC0;\n\t"
+ "%1 = CC;\n\t"
+ "%0 = %0 + %1;\n\t"
+ "%0 = %0 + %3;\n\t"
+ "CC = AC0;\n\t"
+ "%1 = CC;\n\t"
+ "%0 = %0 + %1;\n\t"
+ "%0 = %0 + %4;\n\t"
+ "CC = AC0;\n\t"
+ "%1 = CC;\n\t"
+ "%0 = %0 + %1;\n\t"
+ : "=d" (sum), "=&d" (carry)
+ : "d" (daddr), "d" (saddr), "d" ((len + proto) << 8), "0"(sum));
return (sum);
}
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