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linux/arch/x86/include/asm/xor.h
Jan Beulich f317820cb6 x86/xor: Add alternative SSE implementation only prefetching once per 64-byte line 
On CPUs with 64-byte last level cache lines, this yields roughly
10% better performance, independent of CPU vendor or specific
model (as far as I was able to test).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/5093E4B802000078000A615E@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-01-25 09:23:50 +01:00

500 lines
10 KiB
C
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#ifdef CONFIG_KMEMCHECK
/* kmemcheck doesn't handle MMX/SSE/SSE2 instructions */
# include <asm-generic/xor.h>
#elif !defined(_ASM_X86_XOR_H)
#define _ASM_X86_XOR_H
/*
* Optimized RAID-5 checksumming functions for SSE.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* You should have received a copy of the GNU General Public License
* (for example /usr/src/linux/COPYING); if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Cache avoiding checksumming functions utilizing KNI instructions
* Copyright (C) 1999 Zach Brown (with obvious credit due Ingo)
*/
/*
* Based on
* High-speed RAID5 checksumming functions utilizing SSE instructions.
* Copyright (C) 1998 Ingo Molnar.
*/
/*
* x86-64 changes / gcc fixes from Andi Kleen.
* Copyright 2002 Andi Kleen, SuSE Labs.
*
* This hasn't been optimized for the hammer yet, but there are likely
* no advantages to be gotten from x86-64 here anyways.
*/
#include <asm/i387.h>
#ifdef CONFIG_X86_32
/* reduce register pressure */
# define XOR_CONSTANT_CONSTRAINT "i"
#else
# define XOR_CONSTANT_CONSTRAINT "re"
#endif
#define OFFS(x) "16*("#x")"
#define PF_OFFS(x) "256+16*("#x")"
#define PF0(x) " prefetchnta "PF_OFFS(x)"(%[p1]) ;\n"
#define LD(x, y) " movaps "OFFS(x)"(%[p1]), %%xmm"#y" ;\n"
#define ST(x, y) " movaps %%xmm"#y", "OFFS(x)"(%[p1]) ;\n"
#define PF1(x) " prefetchnta "PF_OFFS(x)"(%[p2]) ;\n"
#define PF2(x) " prefetchnta "PF_OFFS(x)"(%[p3]) ;\n"
#define PF3(x) " prefetchnta "PF_OFFS(x)"(%[p4]) ;\n"
#define PF4(x) " prefetchnta "PF_OFFS(x)"(%[p5]) ;\n"
#define XO1(x, y) " xorps "OFFS(x)"(%[p2]), %%xmm"#y" ;\n"
#define XO2(x, y) " xorps "OFFS(x)"(%[p3]), %%xmm"#y" ;\n"
#define XO3(x, y) " xorps "OFFS(x)"(%[p4]), %%xmm"#y" ;\n"
#define XO4(x, y) " xorps "OFFS(x)"(%[p5]), %%xmm"#y" ;\n"
#define NOP(x)
#define BLK64(pf, op, i) \
pf(i) \
op(i, 0) \
op(i + 1, 1) \
op(i + 2, 2) \
op(i + 3, 3)
static void
xor_sse_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
{
unsigned long lines = bytes >> 8;
kernel_fpu_begin();
asm volatile(
#undef BLOCK
#define BLOCK(i) \
LD(i, 0) \
LD(i + 1, 1) \
PF1(i) \
PF1(i + 2) \
LD(i + 2, 2) \
LD(i + 3, 3) \
PF0(i + 4) \
PF0(i + 6) \
XO1(i, 0) \
XO1(i + 1, 1) \
XO1(i + 2, 2) \
XO1(i + 3, 3) \
ST(i, 0) \
ST(i + 1, 1) \
ST(i + 2, 2) \
ST(i + 3, 3) \
PF0(0)
PF0(2)
" .align 32 ;\n"
" 1: ;\n"
BLOCK(0)
BLOCK(4)
BLOCK(8)
BLOCK(12)
" add %[inc], %[p1] ;\n"
" add %[inc], %[p2] ;\n"
" dec %[cnt] ;\n"
" jnz 1b ;\n"
: [cnt] "+r" (lines),
[p1] "+r" (p1), [p2] "+r" (p2)
: [inc] XOR_CONSTANT_CONSTRAINT (256UL)
: "memory");
kernel_fpu_end();
}
static void
xor_sse_2_pf64(unsigned long bytes, unsigned long *p1, unsigned long *p2)
{
unsigned long lines = bytes >> 8;
kernel_fpu_begin();
asm volatile(
#undef BLOCK
#define BLOCK(i) \
BLK64(PF0, LD, i) \
BLK64(PF1, XO1, i) \
BLK64(NOP, ST, i) \
" .align 32 ;\n"
" 1: ;\n"
BLOCK(0)
BLOCK(4)
BLOCK(8)
BLOCK(12)
" add %[inc], %[p1] ;\n"
" add %[inc], %[p2] ;\n"
" dec %[cnt] ;\n"
" jnz 1b ;\n"
: [cnt] "+r" (lines),
[p1] "+r" (p1), [p2] "+r" (p2)
: [inc] XOR_CONSTANT_CONSTRAINT (256UL)
: "memory");
kernel_fpu_end();
}
static void
xor_sse_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3)
{
unsigned long lines = bytes >> 8;
kernel_fpu_begin();
asm volatile(
#undef BLOCK
#define BLOCK(i) \
PF1(i) \
PF1(i + 2) \
LD(i, 0) \
LD(i + 1, 1) \
LD(i + 2, 2) \
LD(i + 3, 3) \
PF2(i) \
PF2(i + 2) \
PF0(i + 4) \
PF0(i + 6) \
XO1(i, 0) \
XO1(i + 1, 1) \
XO1(i + 2, 2) \
XO1(i + 3, 3) \
XO2(i, 0) \
XO2(i + 1, 1) \
XO2(i + 2, 2) \
XO2(i + 3, 3) \
ST(i, 0) \
ST(i + 1, 1) \
ST(i + 2, 2) \
ST(i + 3, 3) \
PF0(0)
PF0(2)
" .align 32 ;\n"
" 1: ;\n"
BLOCK(0)
BLOCK(4)
BLOCK(8)
BLOCK(12)
" add %[inc], %[p1] ;\n"
" add %[inc], %[p2] ;\n"
" add %[inc], %[p3] ;\n"
" dec %[cnt] ;\n"
" jnz 1b ;\n"
: [cnt] "+r" (lines),
[p1] "+r" (p1), [p2] "+r" (p2), [p3] "+r" (p3)
: [inc] XOR_CONSTANT_CONSTRAINT (256UL)
: "memory");
kernel_fpu_end();
}
static void
xor_sse_3_pf64(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3)
{
unsigned long lines = bytes >> 8;
kernel_fpu_begin();
asm volatile(
#undef BLOCK
#define BLOCK(i) \
BLK64(PF0, LD, i) \
BLK64(PF1, XO1, i) \
BLK64(PF2, XO2, i) \
BLK64(NOP, ST, i) \
" .align 32 ;\n"
" 1: ;\n"
BLOCK(0)
BLOCK(4)
BLOCK(8)
BLOCK(12)
" add %[inc], %[p1] ;\n"
" add %[inc], %[p2] ;\n"
" add %[inc], %[p3] ;\n"
" dec %[cnt] ;\n"
" jnz 1b ;\n"
: [cnt] "+r" (lines),
[p1] "+r" (p1), [p2] "+r" (p2), [p3] "+r" (p3)
: [inc] XOR_CONSTANT_CONSTRAINT (256UL)
: "memory");
kernel_fpu_end();
}
static void
xor_sse_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3, unsigned long *p4)
{
unsigned long lines = bytes >> 8;
kernel_fpu_begin();
asm volatile(
#undef BLOCK
#define BLOCK(i) \
PF1(i) \
PF1(i + 2) \
LD(i, 0) \
LD(i + 1, 1) \
LD(i + 2, 2) \
LD(i + 3, 3) \
PF2(i) \
PF2(i + 2) \
XO1(i, 0) \
XO1(i + 1, 1) \
XO1(i + 2, 2) \
XO1(i + 3, 3) \
PF3(i) \
PF3(i + 2) \
PF0(i + 4) \
PF0(i + 6) \
XO2(i, 0) \
XO2(i + 1, 1) \
XO2(i + 2, 2) \
XO2(i + 3, 3) \
XO3(i, 0) \
XO3(i + 1, 1) \
XO3(i + 2, 2) \
XO3(i + 3, 3) \
ST(i, 0) \
ST(i + 1, 1) \
ST(i + 2, 2) \
ST(i + 3, 3) \
PF0(0)
PF0(2)
" .align 32 ;\n"
" 1: ;\n"
BLOCK(0)
BLOCK(4)
BLOCK(8)
BLOCK(12)
" add %[inc], %[p1] ;\n"
" add %[inc], %[p2] ;\n"
" add %[inc], %[p3] ;\n"
" add %[inc], %[p4] ;\n"
" dec %[cnt] ;\n"
" jnz 1b ;\n"
: [cnt] "+r" (lines), [p1] "+r" (p1),
[p2] "+r" (p2), [p3] "+r" (p3), [p4] "+r" (p4)
: [inc] XOR_CONSTANT_CONSTRAINT (256UL)
: "memory");
kernel_fpu_end();
}
static void
xor_sse_4_pf64(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3, unsigned long *p4)
{
unsigned long lines = bytes >> 8;
kernel_fpu_begin();
asm volatile(
#undef BLOCK
#define BLOCK(i) \
BLK64(PF0, LD, i) \
BLK64(PF1, XO1, i) \
BLK64(PF2, XO2, i) \
BLK64(PF3, XO3, i) \
BLK64(NOP, ST, i) \
" .align 32 ;\n"
" 1: ;\n"
BLOCK(0)
BLOCK(4)
BLOCK(8)
BLOCK(12)
" add %[inc], %[p1] ;\n"
" add %[inc], %[p2] ;\n"
" add %[inc], %[p3] ;\n"
" add %[inc], %[p4] ;\n"
" dec %[cnt] ;\n"
" jnz 1b ;\n"
: [cnt] "+r" (lines), [p1] "+r" (p1),
[p2] "+r" (p2), [p3] "+r" (p3), [p4] "+r" (p4)
: [inc] XOR_CONSTANT_CONSTRAINT (256UL)
: "memory");
kernel_fpu_end();
}
static void
xor_sse_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3, unsigned long *p4, unsigned long *p5)
{
unsigned long lines = bytes >> 8;
kernel_fpu_begin();
asm volatile(
#undef BLOCK
#define BLOCK(i) \
PF1(i) \
PF1(i + 2) \
LD(i, 0) \
LD(i + 1, 1) \
LD(i + 2, 2) \
LD(i + 3, 3) \
PF2(i) \
PF2(i + 2) \
XO1(i, 0) \
XO1(i + 1, 1) \
XO1(i + 2, 2) \
XO1(i + 3, 3) \
PF3(i) \
PF3(i + 2) \
XO2(i, 0) \
XO2(i + 1, 1) \
XO2(i + 2, 2) \
XO2(i + 3, 3) \
PF4(i) \
PF4(i + 2) \
PF0(i + 4) \
PF0(i + 6) \
XO3(i, 0) \
XO3(i + 1, 1) \
XO3(i + 2, 2) \
XO3(i + 3, 3) \
XO4(i, 0) \
XO4(i + 1, 1) \
XO4(i + 2, 2) \
XO4(i + 3, 3) \
ST(i, 0) \
ST(i + 1, 1) \
ST(i + 2, 2) \
ST(i + 3, 3) \
PF0(0)
PF0(2)
" .align 32 ;\n"
" 1: ;\n"
BLOCK(0)
BLOCK(4)
BLOCK(8)
BLOCK(12)
" add %[inc], %[p1] ;\n"
" add %[inc], %[p2] ;\n"
" add %[inc], %[p3] ;\n"
" add %[inc], %[p4] ;\n"
" add %[inc], %[p5] ;\n"
" dec %[cnt] ;\n"
" jnz 1b ;\n"
: [cnt] "+r" (lines), [p1] "+r" (p1), [p2] "+r" (p2),
[p3] "+r" (p3), [p4] "+r" (p4), [p5] "+r" (p5)
: [inc] XOR_CONSTANT_CONSTRAINT (256UL)
: "memory");
kernel_fpu_end();
}
static void
xor_sse_5_pf64(unsigned long bytes, unsigned long *p1, unsigned long *p2,
unsigned long *p3, unsigned long *p4, unsigned long *p5)
{
unsigned long lines = bytes >> 8;
kernel_fpu_begin();
asm volatile(
#undef BLOCK
#define BLOCK(i) \
BLK64(PF0, LD, i) \
BLK64(PF1, XO1, i) \
BLK64(PF2, XO2, i) \
BLK64(PF3, XO3, i) \
BLK64(PF4, XO4, i) \
BLK64(NOP, ST, i) \
" .align 32 ;\n"
" 1: ;\n"
BLOCK(0)
BLOCK(4)
BLOCK(8)
BLOCK(12)
" add %[inc], %[p1] ;\n"
" add %[inc], %[p2] ;\n"
" add %[inc], %[p3] ;\n"
" add %[inc], %[p4] ;\n"
" add %[inc], %[p5] ;\n"
" dec %[cnt] ;\n"
" jnz 1b ;\n"
: [cnt] "+r" (lines), [p1] "+r" (p1), [p2] "+r" (p2),
[p3] "+r" (p3), [p4] "+r" (p4), [p5] "+r" (p5)
: [inc] XOR_CONSTANT_CONSTRAINT (256UL)
: "memory");
kernel_fpu_end();
}
static struct xor_block_template xor_block_sse_pf64 = {
.name = "prefetch64-sse",
.do_2 = xor_sse_2_pf64,
.do_3 = xor_sse_3_pf64,
.do_4 = xor_sse_4_pf64,
.do_5 = xor_sse_5_pf64,
};
#undef LD
#undef XO1
#undef XO2
#undef XO3
#undef XO4
#undef ST
#undef NOP
#undef BLK64
#undef BLOCK
#undef XOR_CONSTANT_CONSTRAINT
#ifdef CONFIG_X86_32
# include <asm/xor_32.h>
#else
# include <asm/xor_64.h>
#endif
#define XOR_SELECT_TEMPLATE(FASTEST) \
AVX_SELECT(FASTEST)
#endif /* _ASM_X86_XOR_H */
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