Chen Jie 615eb603f4 MIPS: csum_partial: Improve instruction parallelism. ... Computing sum introduces true data dependency. This patch removes some true data depdendencies, hence increases instruction level parallelism. This patch brings up to 50% csum performance gain on Loongson 3a. One example about how this patch works is in CSUM_BIGCHUNK1: // ** original ** vs ** patch applied ** ADDC(sum, t0) ADDC(t0, t1) ADDC(sum, t1) ADDC(t2, t3) ADDC(sum, t2) ADDC(sum, t0) ADDC(sum, t3) ADDC(sum, t2) In the original implementation, each ADDC(sum, ...) depends on the sum value updated by previous ADDC(as source operand). With this patch applied, the first two ADDC operations are independent, hence can be executed simultaneously if possible. Another example is in the "copy and sum calculating chunk": // ** original ** vs ** patch applied ** STORE(t0, UNIT(0) ... STORE(t0, UNIT(0) ... ADDC(sum, t0) ADDC(t0, t1) STORE(t1, UNIT(1) ... STORE(t1, UNIT(1) ... ADDC(sum, t1) ADDC(sum, t0) STORE(t2, UNIT(2) ... STORE(t2, UNIT(2) ... ADDC(sum, t2) ADDC(t2, t3) STORE(t3, UNIT(3) ... STORE(t3, UNIT(3) ... ADDC(sum, t3) ADDC(sum, t2) With this patch applied, ADDC and the **next next** ADDC are independent. Signed-off-by: chenj <chenj@lemote.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9608/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>		2015-04-01 17:22:11 +02:00
..
ashldi3.c
ashrdi3.c
bitops.c	MIPS: Remove unneeded volatile from arch/mips/lib/bitops.c	2013-05-08 01:19:06 +02:00
cmpdi2.c
csum_partial.S	MIPS: csum_partial: Improve instruction parallelism.	2015-04-01 17:22:11 +02:00
delay.c	MIPS: __delay ABI-dependent subtraction simplification	2014-05-30 21:01:08 +02:00
dump_tlb.c	Revert "MIPS: Allow ASID size to be determined at boot time."	2013-05-16 20:35:42 +02:00
iomap-pci.c	mips: use the the PCI controller's io_map_base	2012-01-31 23:20:30 +02:00
iomap.c	MIPS: iomap: Use __mem_{read,write}{b,w,l} for MMIO	2014-11-24 07:45:42 +01:00
libgcc.h	MIPS: libgcc.h: Checkpatch cleanup	2010-04-12 17:26:15 +01:00
lshrdi3.c
Makefile	MIPS: Use generic checksum functions for MIPS R6	2015-02-17 15:37:19 +00:00
memcpy.S	MIPS: lib: memcpy: Add MIPS R6 support	2015-02-17 15:37:29 +00:00
memset.S	MIPS: lib: memset: Add MIPS R6 support	2015-02-17 15:37:30 +00:00
mips-atomic.c	MIPS: asm: irqflags: Add MIPS R6 related definitions	2015-02-17 15:37:20 +00:00
r3k_dump_tlb.c	MIPS: R3000: Remove redundant parentheses	2014-11-24 07:45:01 +01:00
strlen_user.S	MIPS: Remove __strlen_user().	2014-11-24 07:45:00 +01:00
strncpy_user.S	MIPS: __strncpy_from_user_asm CPU_DADDI_WORKAROUNDS bug fix	2014-05-13 00:29:38 +02:00
strnlen_user.S	MIPS: Fix strnlen_user() return value in case of overlong strings.	2014-11-04 12:46:33 +01:00
ucmpdi2.c	[MIPS] Export __ucmpdi2 to modules.	2008-03-12 14:14:41 +00:00
uncached.c	mips: delete non-required instances of include <linux/init.h>	2014-01-24 22:39:56 +01:00