25d6e2d7c5
Update memcpy() to add two new feature sections: one for aligning the
destination before copying and one for copying using aligned load
and store doubles.
These new feature sections will only affect Power6 and Cell because
the CPU feature bit was only added to these two processors.
Power6 gets its best performance in memcpy() when aligning neither the
source nor the destination, while Cell gets its best performance when
just the destination is aligned. But in order to save on CPU feature
bits we can use the previously added CPU_FTR_CP_USE_DCBTZ feature bit
to differentiate between Power6 and Cell (because CPU_FTR_CP_USE_DCBTZ
was added to Cell but not Power6).
The first feature section acts to nop out the branch that takes us to
the code that aligns us to an eight byte boundary for the destination.
We only want to nop out this branch on Power6.
So the ALT_FTR_SECTION_END() for this feature section creates a test
mask of the two feature bits ORed together and provides an expected
result of just CPU_FTR_UNALIGNED_LD_STD, thus we nop out the branch
if we're on a CPU that has CPU_FTR_UNALIGNED_LD_STD set and
CPU_FTR_CP_USE_DCBTZ unset.
For the second feature section added, if we're on a CPU that has the
CPU_FTR_UNALIGNED_LD_STD bit set then we don't want to do the copy
with aligned loads and stores (and the appropriate shifting left and
right instructions), so we want to nop out the branch to
.Lsrc_unaligned.
The andi. used for this branch is moved to just above the branch
because this allows us to nop out both instructions with just one
feature section which gives us better performance and doesn't hurt
readability which two separate feature sections did.
Moving the andi. to just above the branch doesn't have any noticeable
negative effect on the remaining 64bit processors (the ones that
didn't have this feature bit added).
On Cell this simple modification results in an improvement to measured
memcpy() bandwidth of up to 50% in the hot cache case and up to 15% in
the cold cache case.
On Power6 we get memory bandwidth results that are up to three times
faster in the hot cache case and up to 50% faster in the cold cache
case.
Commit 2a9294369b ("powerpc: Add new CPU
feature: CPU_FTR_CP_USE_DCBTZ") was where CPU_FTR_CP_USE_DCBTZ was
added.
To say that Cell gets its best performance in memcpy() with just the
destination aligned is true but only for the reason that the indirect
shift and rotate instructions, sld and srd, are microcoded on Cell.
This means that either the destination or the source can be aligned,
but not both, and seeing as we get better performance with the
destination aligned we choose this option.
While we're at it make a one line change from cmpldi r1,... to
cmpldi cr1,... for consistency.
Signed-off-by: Mark Nelson <markn@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
185 lines
3.3 KiB
ArmAsm
185 lines
3.3 KiB
ArmAsm
/*
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* Copyright (C) 2002 Paul Mackerras, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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.align 7
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_GLOBAL(memcpy)
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std r3,48(r1) /* save destination pointer for return value */
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PPC_MTOCRF 0x01,r5
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cmpldi cr1,r5,16
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neg r6,r3 # LS 3 bits = # bytes to 8-byte dest bdry
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andi. r6,r6,7
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dcbt 0,r4
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blt cr1,.Lshort_copy
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/* Below we want to nop out the bne if we're on a CPU that has the
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CPU_FTR_UNALIGNED_LD_STD bit set and the CPU_FTR_CP_USE_DCBTZ bit
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cleared.
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At the time of writing the only CPU that has this combination of bits
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set is Power6. */
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BEGIN_FTR_SECTION
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nop
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FTR_SECTION_ELSE
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bne .Ldst_unaligned
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ALT_FTR_SECTION_END(CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_CP_USE_DCBTZ, \
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CPU_FTR_UNALIGNED_LD_STD)
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.Ldst_aligned:
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addi r3,r3,-16
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BEGIN_FTR_SECTION
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andi. r0,r4,7
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bne .Lsrc_unaligned
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END_FTR_SECTION_IFCLR(CPU_FTR_UNALIGNED_LD_STD)
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srdi r7,r5,4
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ld r9,0(r4)
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addi r4,r4,-8
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mtctr r7
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andi. r5,r5,7
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bf cr7*4+0,2f
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addi r3,r3,8
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addi r4,r4,8
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mr r8,r9
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blt cr1,3f
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1: ld r9,8(r4)
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std r8,8(r3)
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2: ldu r8,16(r4)
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stdu r9,16(r3)
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bdnz 1b
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3: std r8,8(r3)
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beq 3f
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addi r3,r3,16
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ld r9,8(r4)
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.Ldo_tail:
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bf cr7*4+1,1f
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rotldi r9,r9,32
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stw r9,0(r3)
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addi r3,r3,4
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1: bf cr7*4+2,2f
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rotldi r9,r9,16
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sth r9,0(r3)
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addi r3,r3,2
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2: bf cr7*4+3,3f
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rotldi r9,r9,8
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stb r9,0(r3)
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3: ld r3,48(r1) /* return dest pointer */
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blr
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.Lsrc_unaligned:
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srdi r6,r5,3
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addi r5,r5,-16
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subf r4,r0,r4
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srdi r7,r5,4
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sldi r10,r0,3
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cmpdi cr6,r6,3
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andi. r5,r5,7
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mtctr r7
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subfic r11,r10,64
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add r5,r5,r0
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bt cr7*4+0,0f
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ld r9,0(r4) # 3+2n loads, 2+2n stores
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ld r0,8(r4)
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sld r6,r9,r10
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ldu r9,16(r4)
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srd r7,r0,r11
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sld r8,r0,r10
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or r7,r7,r6
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blt cr6,4f
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ld r0,8(r4)
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# s1<< in r8, d0=(s0<<|s1>>) in r7, s3 in r0, s2 in r9, nix in r6 & r12
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b 2f
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0: ld r0,0(r4) # 4+2n loads, 3+2n stores
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ldu r9,8(r4)
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sld r8,r0,r10
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addi r3,r3,-8
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blt cr6,5f
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ld r0,8(r4)
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srd r12,r9,r11
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sld r6,r9,r10
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ldu r9,16(r4)
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or r12,r8,r12
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srd r7,r0,r11
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sld r8,r0,r10
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addi r3,r3,16
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beq cr6,3f
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# d0=(s0<<|s1>>) in r12, s1<< in r6, s2>> in r7, s2<< in r8, s3 in r9
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1: or r7,r7,r6
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ld r0,8(r4)
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std r12,8(r3)
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2: srd r12,r9,r11
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sld r6,r9,r10
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ldu r9,16(r4)
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or r12,r8,r12
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stdu r7,16(r3)
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srd r7,r0,r11
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sld r8,r0,r10
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bdnz 1b
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3: std r12,8(r3)
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or r7,r7,r6
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4: std r7,16(r3)
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5: srd r12,r9,r11
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or r12,r8,r12
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std r12,24(r3)
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beq 4f
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cmpwi cr1,r5,8
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addi r3,r3,32
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sld r9,r9,r10
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ble cr1,.Ldo_tail
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ld r0,8(r4)
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srd r7,r0,r11
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or r9,r7,r9
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b .Ldo_tail
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.Ldst_unaligned:
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PPC_MTOCRF 0x01,r6 # put #bytes to 8B bdry into cr7
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subf r5,r6,r5
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li r7,0
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cmpldi cr1,r5,16
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bf cr7*4+3,1f
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lbz r0,0(r4)
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stb r0,0(r3)
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addi r7,r7,1
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1: bf cr7*4+2,2f
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lhzx r0,r7,r4
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sthx r0,r7,r3
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addi r7,r7,2
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2: bf cr7*4+1,3f
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lwzx r0,r7,r4
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stwx r0,r7,r3
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3: PPC_MTOCRF 0x01,r5
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add r4,r6,r4
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add r3,r6,r3
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b .Ldst_aligned
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.Lshort_copy:
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bf cr7*4+0,1f
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lwz r0,0(r4)
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lwz r9,4(r4)
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addi r4,r4,8
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stw r0,0(r3)
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stw r9,4(r3)
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addi r3,r3,8
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1: bf cr7*4+1,2f
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lwz r0,0(r4)
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addi r4,r4,4
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stw r0,0(r3)
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addi r3,r3,4
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2: bf cr7*4+2,3f
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lhz r0,0(r4)
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addi r4,r4,2
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sth r0,0(r3)
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addi r3,r3,2
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3: bf cr7*4+3,4f
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lbz r0,0(r4)
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stb r0,0(r3)
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4: ld r3,48(r1) /* return dest pointer */
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blr
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