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* sysdeps/powerpc/powerpc32/power6/memset.S: Update comments.

Browse Source 
Specify .machine power6 to get ISA-V2.0 branch hints.  Unroll loops
	and avoid branch misspredicts for > 31 bytes memset case.
	* sysdeps/powerpc/powerpc64/power6/memset.S: Likewise.
	Remove toc ref to __cache_line_size.

	* sysdeps/powerpc/powerpc32/power4/memcmp.S: Specify .machine power4
	to get ISA-V2.0 branch hints.
	* sysdeps/powerpc/powerpc32/power4/memcpy.S: Likewise
	* sysdeps/powerpc/powerpc32/power4/memset.S: Likewise
	* sysdeps/powerpc/powerpc32/power6/memcpy.S: Likewise.
	* sysdeps/powerpc/powerpc64/power4/memcmp.S: Likewise.
	* sysdeps/powerpc/powerpc64/power4/memcpy.S: Likewise.
	* sysdeps/powerpc/powerpc64/power4/memset.S: Likewise.
	Remove toc ref to __cache_line_size.

	* sysdeps/powerpc/powerpc32/power6/fpu/s_llrint.S:
	Include math_ldbl_opt.h.
This commit is contained in:
Ulrich Drepper 2007-07-12 18:38:01 +00:00
parent 1c298d0887
commit a88f47a72f
11 changed files with 626 additions and 158 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
ChangeLog
View File

@ -49,6 +49,27 @@
* intl/explodename.c (_nl_explode_name): Return -1 if
_nl_normalize_codeset failed.
2007-07-07 Steven Munroe <sjmunroe@us.ibm.com>
* sysdeps/powerpc/powerpc32/power6/memset.S: Update comments.
Specify .machine power6 to get ISA-V2.0 branch hints. Unroll loops
and avoid branch misspredicts for > 31 bytes memset case.
* sysdeps/powerpc/powerpc64/power6/memset.S: Likewise.
Remove toc ref to __cache_line_size.
* sysdeps/powerpc/powerpc32/power4/memcmp.S: Specify .machine power4
to get ISA-V2.0 branch hints.
* sysdeps/powerpc/powerpc32/power4/memcpy.S: Likewise
* sysdeps/powerpc/powerpc32/power4/memset.S: Likewise
* sysdeps/powerpc/powerpc32/power6/memcpy.S: Likewise.
* sysdeps/powerpc/powerpc64/power4/memcmp.S: Likewise.
* sysdeps/powerpc/powerpc64/power4/memcpy.S: Likewise.
* sysdeps/powerpc/powerpc64/power4/memset.S: Likewise.
Remove toc ref to __cache_line_size.
* sysdeps/powerpc/powerpc32/power6/fpu/s_llrint.S:
Include math_ldbl_opt.h.
2007-07-10 Ulrich Drepper <drepper@redhat.com>
[BZ #4773]

1
sysdeps/powerpc/powerpc32/power4/memcmp.S
View File

@ -23,6 +23,7 @@
/* int [r3] memcmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5]) */
.machine power4
EALIGN (BP_SYM(memcmp), 4, 0)
CALL_MCOUNT

1
sysdeps/powerpc/powerpc32/power4/memcpy.S
View File

@ -34,6 +34,7 @@
possible when both source and destination are word aligned.
Each case has an optimized unrolled loop. */
.machine power4
EALIGN (BP_SYM (memcpy), 5, 0)
CALL_MCOUNT

1
sysdeps/powerpc/powerpc32/power4/memset.S
View File

@ -28,6 +28,7 @@
cache line (1024 bits). There is a special case for setting cache lines
to 0, to take advantage of the dcbz instruction. */
.machine power4
EALIGN (BP_SYM (memset), 5, 0)
CALL_MCOUNT

1
sysdeps/powerpc/powerpc32/power6/fpu/s_llrint.S
View File

@ -18,6 +18,7 @@
02110-1301 USA. */
#include <sysdep.h>
#include <math_ldbl_opt.h>
/* long long int[r3, r4] __llrint (double x[fp1]) */
ENTRY (__llrint)

1
sysdeps/powerpc/powerpc32/power6/memcpy.S
View File

@ -34,6 +34,7 @@
possible when both source and destination are word aligned.
Each case has an optimized unrolled loop. */
.machine power6
EALIGN (BP_SYM (memcpy), 5, 0)
CALL_MCOUNT

453
sysdeps/powerpc/powerpc32/power6/memset.S
View File

@ -1,5 +1,5 @@
/* Optimized memset implementation for PowerPC64.
Copyright (C) 1997,99, 2000,02,03, 2006 Free Software Foundation, Inc.
/* Optimized 32-bit memset implementation for POWER6.
Copyright (C) 1997,99, 2000,02,03,06,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -28,7 +28,8 @@
cache line (1024 bits). There is a special case for setting cache lines
to 0, to take advantage of the dcbz instruction. */
EALIGN (BP_SYM (memset), 5, 0)
.machine power6
EALIGN (BP_SYM (memset), 7, 0)
CALL_MCOUNT
#define rTMP r0
@ -41,15 +42,13 @@ EALIGN (BP_SYM (memset), 5, 0)
#define rMEMP2 r8
#define rNEG64 r8 /* Constant -64 for clearing with dcbz. */
#define rCLS r8 /* Cache line size (known to be 128). */
#define rCLM r9 /* Cache line size mask to check for cache alignment. */
#define rMEMP3 r9 /* Alt mem pointer. */
L(_memset):
/* Take care of case for size <= 4. */
cmplwi cr1, rLEN, 4
andi. rALIGN, rMEMP0, 3
mr rMEMP, rMEMP0
ble- cr1, L(small)
/* Align to word boundary. */
cmplwi cr5, rLEN, 31
rlwimi rCHR, rCHR, 8, 16, 23 /* Replicate byte to halfword. */
@ -82,6 +81,7 @@ L(aligned):
bf 28, L(a1)
stw rCHR, -4(rMEMP2)
stwu rCHR, -8(rMEMP2)
nop
L(a1): blt cr1, L(a2)
stw rCHR, -4(rMEMP2)
stw rCHR, -8(rMEMP2)
@ -90,7 +90,7 @@ L(a1): blt cr1, L(a2)
L(a2): bf 29, L(caligned)
stw rCHR, -4(rMEMP2)
.align 4
.align 3
/* Now aligned to a 32 byte boundary. */
L(caligned):
cmplwi cr1, rCHR, 0
@ -98,83 +98,394 @@ L(caligned):
mtcrf 0x01, rLEN
beq cr1, L(zloopstart) /* Special case for clearing memory using dcbz. */
L(nondcbz):
srwi rTMP, rALIGN, 5
mtctr rTMP
beq L(medium) /* We may not actually get to do a full line. */
clrlwi. rLEN, rLEN, 27
add rMEMP, rMEMP, rALIGN
li rNEG64, -0x40
bdz L(cloopdone)
nop
/* Storing a non-zero "c" value. We are aligned at a sector (32-byte)
boundary may not be at cache line (128-byte) boundary. */
L(nzloopstart):
/* memset in 32-byte chunks until we get to a cache line boundary.
If rLEN is less then the distance to the next cache-line boundary use
cacheAligned1 code to finish the tail. */
cmplwi cr1,rLEN,128
andi. rTMP,rMEMP,127
blt cr1,L(cacheAligned1)
addi rMEMP3,rMEMP,32
beq L(nzCacheAligned)
addi rLEN,rLEN,-32
stw rCHR,0(rMEMP)
stw rCHR,4(rMEMP)
stw rCHR,8(rMEMP)
stw rCHR,12(rMEMP)
stw rCHR,16(rMEMP)
stw rCHR,20(rMEMP)
addi rMEMP,rMEMP,32
andi. rTMP,rMEMP3,127
stw rCHR,-8(rMEMP3)
stw rCHR,-4(rMEMP3)
beq L(nzCacheAligned)
addi rLEN,rLEN,-32
stw rCHR,0(rMEMP3)
stw rCHR,4(rMEMP3)
addi rMEMP,rMEMP,32
stw rCHR,8(rMEMP3)
stw rCHR,12(rMEMP3)
andi. rTMP,rMEMP,127
stw rCHR,16(rMEMP3)
stw rCHR,20(rMEMP3)
stw rCHR,24(rMEMP3)
stw rCHR,28(rMEMP3)
beq L(nzCacheAligned)
addi rLEN,rLEN,-32
/* At this point we can overrun the store queue (pipe reject) so it is
time to slow things down. The store queue can merge two adjacent
stores into a single L1/L2 op, but the L2 is clocked at 1/2 the CPU.
So we add "group ending nops" to guarantee that we dispatch only two
stores every other cycle. */
ori r1,r1,0
ori r1,r1,0
stw rCHR,32(rMEMP3)
stw rCHR,36(rMEMP3)
addi rMEMP,rMEMP,32
cmplwi cr1,rLEN,128
ori r1,r1,0
ori r1,r1,0
stw rCHR,40(rMEMP3)
stw rCHR,44(rMEMP3)
ori r1,r1,0
ori r1,r1,0
stw rCHR,48(rMEMP3)
stw rCHR,52(rMEMP3)
ori r1,r1,0
ori r1,r1,0
stw rCHR,56(rMEMP3)
stw rCHR,60(rMEMP3)
blt cr1,L(cacheAligned1)
b L(nzCacheAligned)
/* Now we are aligned to the cache line and can use dcbtst. */
.align 5
L(nzCacheAligned):
cmplwi cr1,rLEN,128
cmplwi cr6,rLEN,256
blt cr1,L(cacheAligned1)
blt cr6,L(nzCacheAligned128)
.align 4
L(nzCacheAligned128):
nop
addi rMEMP3,rMEMP,64
stw rCHR,0(rMEMP)
stw rCHR,4(rMEMP)
stw rCHR,8(rMEMP)
stw rCHR,12(rMEMP)
stw rCHR,16(rMEMP)
stw rCHR,20(rMEMP)
stw rCHR,24(rMEMP)
stw rCHR,28(rMEMP)
stw rCHR,32(rMEMP)
stw rCHR,36(rMEMP)
stw rCHR,40(rMEMP)
stw rCHR,44(rMEMP)
stw rCHR,48(rMEMP)
stw rCHR,52(rMEMP)
stw rCHR,56(rMEMP)
stw rCHR,60(rMEMP)
addi rMEMP,rMEMP3,64
addi rLEN,rLEN,-128
/* At this point we can overrun the store queue (pipe reject) so it is
time to slow things down. The store queue can merge two adjacent
stores into a single L1/L2 op, but the L2 is clocked at 1/2 the CPU.
So we add "group ending nops" to guarantee that we dispatch only one
store per cycle. */
stw rCHR,0(rMEMP3)
ori r1,r1,0
stw rCHR,4(rMEMP3)
ori r1,r1,0
stw rCHR,8(rMEMP3)
ori r1,r1,0
stw rCHR,12(rMEMP3)
ori r1,r1,0
stw rCHR,16(rMEMP3)
ori r1,r1,0
stw rCHR,20(rMEMP3)
ori r1,r1,0
stw rCHR,24(rMEMP3)
ori r1,r1,0
stw rCHR,28(rMEMP3)
ori r1,r1,0
stw rCHR,32(rMEMP3)
ori r1,r1,0
stw rCHR,36(rMEMP3)
ori r1,r1,0
stw rCHR,40(rMEMP3)
ori r1,r1,0
stw rCHR,44(rMEMP3)
ori r1,r1,0
stw rCHR,48(rMEMP3)
ori r1,r1,0
stw rCHR,52(rMEMP3)
ori r1,r1,0
stw rCHR,56(rMEMP3)
ori r1,r1,0
stw rCHR,60(rMEMP3)
blt cr6,L(cacheAligned1)
#ifndef NOT_IN_libc
lfd 0,-128(rMEMP)
#endif
b L(nzCacheAligned256)
.align 5
L(nzCacheAligned256):
cmplwi cr1,rLEN,256
addi rMEMP3,rMEMP,64
#ifdef NOT_IN_libc
/* When we are not in libc we should use only GPRs to avoid the FPU lock
interrupt. */
stw rCHR,0(rMEMP)
stw rCHR,4(rMEMP)
stw rCHR,8(rMEMP)
stw rCHR,12(rMEMP)
stw rCHR,16(rMEMP)
stw rCHR,20(rMEMP)
stw rCHR,24(rMEMP)
stw rCHR,28(rMEMP)
stw rCHR,32(rMEMP)
stw rCHR,36(rMEMP)
stw rCHR,40(rMEMP)
stw rCHR,44(rMEMP)
stw rCHR,48(rMEMP)
stw rCHR,52(rMEMP)
stw rCHR,56(rMEMP)
stw rCHR,60(rMEMP)
addi rMEMP,rMEMP3,64
addi rLEN,rLEN,-128
stw rCHR,0(rMEMP3)
stw rCHR,4(rMEMP3)
stw rCHR,8(rMEMP3)
stw rCHR,12(rMEMP3)
stw rCHR,16(rMEMP3)
stw rCHR,20(rMEMP3)
stw rCHR,24(rMEMP3)
stw rCHR,28(rMEMP3)
stw rCHR,32(rMEMP3)
stw rCHR,36(rMEMP3)
stw rCHR,40(rMEMP3)
stw rCHR,44(rMEMP3)
stw rCHR,48(rMEMP3)
stw rCHR,52(rMEMP3)
stw rCHR,56(rMEMP3)
stw rCHR,60(rMEMP3)
#else
/* We are in libc and this is a long memset so we can use FPRs and can afford
occasional FPU locked interrupts. */
stfd 0,0(rMEMP)
stfd 0,8(rMEMP)
stfd 0,16(rMEMP)
stfd 0,24(rMEMP)
stfd 0,32(rMEMP)
stfd 0,40(rMEMP)
stfd 0,48(rMEMP)
stfd 0,56(rMEMP)
addi rMEMP,rMEMP3,64
addi rLEN,rLEN,-128
stfd 0,0(rMEMP3)
stfd 0,8(rMEMP3)
stfd 0,16(rMEMP3)
stfd 0,24(rMEMP3)
stfd 0,32(rMEMP3)
stfd 0,40(rMEMP3)
stfd 0,48(rMEMP3)
stfd 0,56(rMEMP3)
#endif
bge cr1,L(nzCacheAligned256)
dcbtst 0,rMEMP
b L(cacheAligned1)
.align 4
L(c3): dcbtst rNEG64, rMEMP
stw rCHR, -4(rMEMP)
stw rCHR, -8(rMEMP)
stw rCHR, -12(rMEMP)
stw rCHR, -16(rMEMP)
stw rCHR, -20(rMEMP)
stw rCHR, -24(rMEMP)
stw rCHR, -28(rMEMP)
stwu rCHR, -32(rMEMP)
bdnz L(c3)
L(cloopdone):
stw rCHR, -4(rMEMP)
stw rCHR, -8(rMEMP)
stw rCHR, -12(rMEMP)
stw rCHR, -16(rMEMP)
cmplwi cr1, rLEN, 16
stw rCHR, -20(rMEMP)
stw rCHR, -24(rMEMP)
stw rCHR, -28(rMEMP)
stwu rCHR, -32(rMEMP)
beqlr
add rMEMP, rMEMP, rALIGN
b L(medium_tail2)
.align 5
/* Clear lines of memory in 128-byte chunks. */
/* Storing a zero "c" value. We are aligned at a sector (32-byte)
boundary but may not be at cache line (128-byte) boundary. If the
remaining length spans a full cache line we can use the Data cache
block zero instruction. */
L(zloopstart):
/* If the remaining length is less the 32 bytes, don't bother getting
the cache line size. */
/* memset in 32-byte chunks until we get to a cache line boundary.
If rLEN is less then the distance to the next cache-line boundary use
cacheAligned1 code to finish the tail. */
cmplwi cr1,rLEN,128
beq L(medium)
li rCLS,128 /* cache line size is 128 */
dcbt 0,rMEMP
L(getCacheAligned):
cmplwi cr1,rLEN,32
andi. rTMP,rMEMP,127
blt cr1,L(handletail32)
blt cr1,L(cacheAligned1)
addi rMEMP3,rMEMP,32
beq L(cacheAligned)
addi rMEMP,rMEMP,32
addi rLEN,rLEN,-32
stw rCHR,-32(rMEMP)
stw rCHR,-28(rMEMP)
stw rCHR,-24(rMEMP)
stw rCHR,-20(rMEMP)
stw rCHR,-16(rMEMP)
stw rCHR,-12(rMEMP)
stw rCHR,-8(rMEMP)
stw rCHR,-4(rMEMP)
b L(getCacheAligned)
stw rCHR,0(rMEMP)
stw rCHR,4(rMEMP)
stw rCHR,8(rMEMP)
stw rCHR,12(rMEMP)
stw rCHR,16(rMEMP)
stw rCHR,20(rMEMP)
addi rMEMP,rMEMP,32
andi. rTMP,rMEMP3,127
stw rCHR,-8(rMEMP3)
stw rCHR,-4(rMEMP3)
L(getCacheAligned2):
beq L(cacheAligned)
addi rLEN,rLEN,-32
addi rMEMP,rMEMP,32
stw rCHR,0(rMEMP3)
stw rCHR,4(rMEMP3)
stw rCHR,8(rMEMP3)
stw rCHR,12(rMEMP3)
andi. rTMP,rMEMP,127
nop
stw rCHR,16(rMEMP3)
stw rCHR,20(rMEMP3)
stw rCHR,24(rMEMP3)
stw rCHR,28(rMEMP3)
L(getCacheAligned3):
beq L(cacheAligned)
/* At this point we can overrun the store queue (pipe reject) so it is
time to slow things down. The store queue can merge two adjacent
stores into a single L1/L2 op, but the L2 is clocked at 1/2 the CPU.
So we add "group ending nops" to guarantee that we dispatch only two
stores every other cycle. */
addi rLEN,rLEN,-32
ori r1,r1,0
ori r1,r1,0
stw rCHR,32(rMEMP3)
stw rCHR,36(rMEMP3)
addi rMEMP,rMEMP,32
cmplwi cr1,rLEN,128
ori r1,r1,0
stw rCHR,40(rMEMP3)
stw rCHR,44(rMEMP3)
cmplwi cr6,rLEN,256
li rMEMP2,128
ori r1,r1,0
stw rCHR,48(rMEMP3)
stw rCHR,52(rMEMP3)
ori r1,r1,0
ori r1,r1,0
stw rCHR,56(rMEMP3)
stw rCHR,60(rMEMP3)
blt cr1,L(cacheAligned1)
blt cr6,L(cacheAligned128)
b L(cacheAlignedx)
/* Now we are aligned to the cache line and can use dcbz. */
.align 4
L(cacheAligned):
cmplw cr1,rLEN,rCLS
blt cr1,L(handletail32)
cmplwi cr1,rLEN,128
cmplwi cr6,rLEN,256
blt cr1,L(cacheAligned1)
li rMEMP2,128
L(cacheAlignedx):
cmpldi cr5,rLEN,640
blt cr6,L(cacheAligned128)
bgt cr5,L(cacheAligned512)
cmplwi cr6,rLEN,512
dcbz 0,rMEMP
subf rLEN,rCLS,rLEN
add rMEMP,rMEMP,rCLS
b L(cacheAligned)
cmplwi cr1,rLEN,384
dcbz rMEMP2,rMEMP
addi rMEMP,rMEMP,256
addi rLEN,rLEN,-256
blt cr1,L(cacheAligned1)
blt cr6,L(cacheAligned128)
b L(cacheAligned256)
.align 5
/* A simple loop for the longer (>640 bytes) lengths. This form limits
the branch miss-predicted to exactly 1 at loop exit.*/
L(cacheAligned512):
cmpli cr1,rLEN,128
blt cr1,L(cacheAligned1)
dcbz 0,rMEMP
addi rLEN,rLEN,-128
addi rMEMP,rMEMP,128
b L(cacheAligned512)
.align 5
L(cacheAligned256):
cmplwi cr6,rLEN,512
dcbz 0,rMEMP
cmplwi cr1,rLEN,384
dcbz rMEMP2,rMEMP
addi rMEMP,rMEMP,256
addi rLEN,rLEN,-256
bge cr6,L(cacheAligned256)
blt cr1,L(cacheAligned1)
.align 4
L(cacheAligned128):
dcbz 0,rMEMP
addi rMEMP,rMEMP,128
addi rLEN,rLEN,-128
.align 4
L(cacheAligned1):
cmplwi cr1,rLEN,32
blt cr1,L(handletail32)
addi rMEMP3,rMEMP,32
addi rLEN,rLEN,-32
stw rCHR,0(rMEMP)
stw rCHR,4(rMEMP)
stw rCHR,8(rMEMP)
stw rCHR,12(rMEMP)
stw rCHR,16(rMEMP)
stw rCHR,20(rMEMP)
addi rMEMP,rMEMP,32
cmplwi cr1,rLEN,32
stw rCHR,-8(rMEMP3)
stw rCHR,-4(rMEMP3)
L(cacheAligned2):
blt cr1,L(handletail32)
addi rLEN,rLEN,-32
stw rCHR,0(rMEMP3)
stw rCHR,4(rMEMP3)
stw rCHR,8(rMEMP3)
stw rCHR,12(rMEMP3)
addi rMEMP,rMEMP,32
cmplwi cr1,rLEN,32
stw rCHR,16(rMEMP3)
stw rCHR,20(rMEMP3)
stw rCHR,24(rMEMP3)
stw rCHR,28(rMEMP3)
nop
L(cacheAligned3):
blt cr1,L(handletail32)
/* At this point we can overrun the store queue (pipe reject) so it is
time to slow things down. The store queue can merge two adjacent
stores into a single L1/L2 op, but the L2 is clocked at 1/2 the CPU.
So we add "group ending nops" to guarantee that we dispatch only two
stores every other cycle. */
ori r1,r1,0
ori r1,r1,0
addi rMEMP,rMEMP,32
addi rLEN,rLEN,-32
ori r1,r1,0
ori r1,r1,0
stw rCHR,32(rMEMP3)
stw rCHR,36(rMEMP3)
ori r1,r1,0
ori r1,r1,0
stw rCHR,40(rMEMP3)
stw rCHR,44(rMEMP3)
ori r1,r1,0
ori r1,r1,0
stw rCHR,48(rMEMP3)
stw rCHR,52(rMEMP3)
ori r1,r1,0
ori r1,r1,0
stw rCHR,56(rMEMP3)
stw rCHR,60(rMEMP3)
/* We are here because the cache line size was set and the remainder
(rLEN) is less than the actual cache line size.
So set up the preconditions for L(nondcbz) and go there. */
/* We are here because the length or remainder (rLEN) is less than the
cache line/sector size and does not justify aggressive loop unrolling.
So set up the preconditions for L(medium) and go there. */
.align 3
L(handletail32):
clrrwi. rALIGN, rLEN, 5
b L(nondcbz)
cmplwi cr1,rLEN,0
beqlr cr1
b L(medium)
.align 5
.align 4
L(small):
/* Memset of 4 bytes or less. */
cmplwi cr5, rLEN, 1
@ -199,10 +510,10 @@ L(medium_tail):
bt- 31, L(medium_31t)
bt- 30, L(medium_30t)
L(medium_30f):
bt- 29, L(medium_29t)
bt 29, L(medium_29t)
L(medium_29f):
bge- cr1, L(medium_27t)
bflr- 28
bge cr1, L(medium_27t)
bflr 28
stw rCHR, -4(rMEMP)
stw rCHR, -8(rMEMP)
blr
@ -215,14 +526,14 @@ L(medium_30t):
bf- 29, L(medium_29f)
L(medium_29t):
stwu rCHR, -4(rMEMP)
blt- cr1, L(medium_27f)
blt cr1, L(medium_27f)
L(medium_27t):
stw rCHR, -4(rMEMP)
stw rCHR, -8(rMEMP)
stw rCHR, -12(rMEMP)
stwu rCHR, -16(rMEMP)
L(medium_27f):
bflr- 28
bflr 28
L(medium_28t):
stw rCHR, -4(rMEMP)
stw rCHR, -8(rMEMP)

1
sysdeps/powerpc/powerpc64/power4/memcmp.S
View File

@ -23,6 +23,7 @@
/* int [r3] memcmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5]) */
.machine power4
EALIGN (BP_SYM(memcmp), 4, 0)
CALL_MCOUNT 3

1
sysdeps/powerpc/powerpc64/power4/memcpy.S
View File

@ -36,6 +36,7 @@
posible when both source and destination are doubleword aligned.
Each case has a optimized unrolled loop. */
.machine power4
EALIGN (BP_SYM (memcpy), 5, 0)
CALL_MCOUNT 3

7
sysdeps/powerpc/powerpc64/power4/memset.S
View File

@ -22,12 +22,6 @@
#include <bp-sym.h>
#include <bp-asm.h>
.section ".toc","aw"
.LC0:
.tc __cache_line_size[TC],__cache_line_size
.section ".text"
.align 2
/* __ptr_t [r3] memset (__ptr_t s [r3], int c [r4], size_t n [r5]));
Returns 's'.
@ -35,6 +29,7 @@
cache line (256 bits). There is a special case for setting cache lines
to 0, to take advantage of the dcbz instruction. */
.machine power4
EALIGN (BP_SYM (memset), 5, 0)
CALL_MCOUNT 3

284
sysdeps/powerpc/powerpc64/power6/memset.S
View File

@ -1,4 +1,4 @@
/* Optimized memset implementation for PowerPC64.
/* Optimized 64-bit memset implementation for POWER6.
Copyright (C) 1997, 1999, 2000, 2002, 2003, 2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -22,12 +22,6 @@
#include <bp-sym.h>
#include <bp-asm.h>
.section ".toc","aw"
.LC0:
.tc __cache_line_size[TC],__cache_line_size
.section ".text"
.align 2
/* __ptr_t [r3] memset (__ptr_t s [r3], int c [r4], size_t n [r5]));
Returns 's'.
@ -35,7 +29,8 @@
cache line (256 bits). There is a special case for setting cache lines
to 0, to take advantage of the dcbz instruction. */
EALIGN (BP_SYM (memset), 5, 0)
.machine power6
EALIGN (BP_SYM (memset), 7, 0)
CALL_MCOUNT 3
#define rTMP r0
@ -53,10 +48,7 @@ EALIGN (BP_SYM (memset), 5, 0)
#endif
#define rALIGN r7 /* Number of bytes we are setting now (when aligning). */
#define rMEMP2 r8
#define rNEG64 r8 /* Constant -64 for clearing with dcbz. */
#define rCLS r8 /* Cache line size obtained from static. */
#define rCLM r9 /* Cache line size mask to check for cache alignment. */
#define rMEMP3 r9 /* Alt mem pointer. */
L(_memset):
#if __BOUNDED_POINTERS__
cmpldi cr1, rRTN, 0
@ -70,7 +62,7 @@ L(b0):
cmpldi cr1, rLEN, 8
andi. rALIGN, rMEMP0, 7
mr rMEMP, rMEMP0
ble- cr1, L(small)
ble cr1, L(small)
/* Align to doubleword boundary. */
cmpldi cr5, rLEN, 31
@ -131,75 +123,217 @@ L(caligned):
clrrdi. rALIGN, rLEN, 5
mtcrf 0x01, rLEN
beq cr1, L(zloopstart) /* Special case for clearing memory using dcbz. */
L(nondcbz):
srdi rTMP, rALIGN, 5
mtctr rTMP
beq L(medium) /* We may not actually get to do a full line. */
clrldi. rLEN, rLEN, 59
add rMEMP, rMEMP, rALIGN
li rNEG64, -0x40
bdz L(cloopdone)
.align 4
L(c3): dcbtst rNEG64, rMEMP
std rCHR, -8(rMEMP)
std rCHR, -16(rMEMP)
std rCHR, -24(rMEMP)
stdu rCHR, -32(rMEMP)
bdnz L(c3)
.align 4
L(cloopdone):
std rCHR, -8(rMEMP)
std rCHR, -16(rMEMP)
cmpldi cr1, rLEN, 16
std rCHR, -24(rMEMP)
stdu rCHR, -32(rMEMP)
beqlr
add rMEMP, rMEMP, rALIGN
b L(medium_tail2)
/* Storing a non-zero "c" value. We are aligned at a sector (32-byte)
boundary may not be at cache line (128-byte) boundary. */
L(nzloopstart):
/* memset in 32-byte chunks until we get to a cache line boundary.
If rLEN is less then the distance to the next cache-line boundary use
cacheAligned1 code to finish the tail. */
cmpldi cr1,rLEN,128
.align 5
/* Clear lines of memory in 128-byte chunks. */
L(zloopstart):
/* If the remaining length is less the 32 bytes, don't bother getting
the cache line size. */
beq L(medium)
li rCLS,128 /* cache line size is 128 */
/* Now we know the cache line size, and it is not 32-bytes, but
we may not yet be aligned to the cache line. May have a partial
line to fill, so touch it 1st. */
dcbt 0,rMEMP
L(getCacheAligned):
cmpldi cr1,rLEN,32
andi. rTMP,rMEMP,127
blt cr1,L(handletail32)
beq L(cacheAligned)
addi rMEMP,rMEMP,32
blt cr1,L(cacheAligned1)
addi rMEMP3,rMEMP,32
beq L(nzCacheAligned)
addi rLEN,rLEN,-32
std rCHR,-32(rMEMP)
std rCHR,-24(rMEMP)
std rCHR,-16(rMEMP)
std rCHR,-8(rMEMP)
b L(getCacheAligned)
std rCHR,0(rMEMP)
std rCHR,8(rMEMP)
std rCHR,16(rMEMP)
addi rMEMP,rMEMP,32
andi. rTMP,rMEMP3,127
std rCHR,-8(rMEMP3)
beq L(nzCacheAligned)
addi rLEN,rLEN,-32
std rCHR,0(rMEMP3)
addi rMEMP,rMEMP,32
std rCHR,8(rMEMP3)
andi. rTMP,rMEMP,127
std rCHR,16(rMEMP3)
std rCHR,24(rMEMP3)
beq L(nzCacheAligned)
addi rLEN,rLEN,-32
std rCHR,32(rMEMP3)
addi rMEMP,rMEMP,32
cmpldi cr1,rLEN,128
std rCHR,40(rMEMP3)
cmpldi cr6,rLEN,256
li rMEMP2,128
std rCHR,48(rMEMP3)
std rCHR,56(rMEMP3)
blt cr1,L(cacheAligned1)
b L(nzCacheAligned128)
/* Now we are aligned to the cache line and can use dcbtst. */
.align 4
L(nzCacheAligned):
cmpldi cr1,rLEN,128
blt cr1,L(cacheAligned1)
b L(nzCacheAligned128)
.align 5
L(nzCacheAligned128):
cmpldi cr1,rLEN,256
addi rMEMP3,rMEMP,64
std rCHR,0(rMEMP)
std rCHR,8(rMEMP)
std rCHR,16(rMEMP)
std rCHR,24(rMEMP)
std rCHR,32(rMEMP)
std rCHR,40(rMEMP)
std rCHR,48(rMEMP)
std rCHR,56(rMEMP)
addi rMEMP,rMEMP3,64
addi rLEN,rLEN,-128
std rCHR,0(rMEMP3)
std rCHR,8(rMEMP3)
std rCHR,16(rMEMP3)
std rCHR,24(rMEMP3)
std rCHR,32(rMEMP3)
std rCHR,40(rMEMP3)
std rCHR,48(rMEMP3)
std rCHR,56(rMEMP3)
bge cr1,L(nzCacheAligned128)
dcbtst 0,rMEMP
b L(cacheAligned1)
.align 5
/* Storing a zero "c" value. We are aligned at a sector (32-byte)
boundary but may not be at cache line (128-byte) boundary. If the
remaining length spans a full cache line we can use the Data cache
block zero instruction. */
L(zloopstart):
/* memset in 32-byte chunks until we get to a cache line boundary.
If rLEN is less then the distance to the next cache-line boundary use
cacheAligned1 code to finish the tail. */
cmpldi cr1,rLEN,128
beq L(medium)
L(getCacheAligned):
andi. rTMP,rMEMP,127
nop
blt cr1,L(cacheAligned1)
addi rMEMP3,rMEMP,32
beq L(cacheAligned)
addi rLEN,rLEN,-32
std rCHR,0(rMEMP)
std rCHR,8(rMEMP)
std rCHR,16(rMEMP)
addi rMEMP,rMEMP,32
andi. rTMP,rMEMP3,127
std rCHR,-8(rMEMP3)
L(getCacheAligned2):
beq L(cacheAligned)
addi rLEN,rLEN,-32
std rCHR,0(rMEMP3)
std rCHR,8(rMEMP3)
addi rMEMP,rMEMP,32
andi. rTMP,rMEMP,127
std rCHR,16(rMEMP3)
std rCHR,24(rMEMP3)
L(getCacheAligned3):
beq L(cacheAligned)
addi rLEN,rLEN,-32
std rCHR,32(rMEMP3)
addi rMEMP,rMEMP,32
cmpldi cr1,rLEN,128
std rCHR,40(rMEMP3)
cmpldi cr6,rLEN,256
li rMEMP2,128
std rCHR,48(rMEMP3)
std rCHR,56(rMEMP3)
blt cr1,L(cacheAligned1)
blt cr6,L(cacheAligned128)
b L(cacheAlignedx)
/* Now we are aligned to the cache line and can use dcbz. */
.align 4
.align 5
L(cacheAligned):
cmpld cr1,rLEN,rCLS
blt cr1,L(handletail32)
cmpldi cr1,rLEN,128
cmpldi cr6,rLEN,256
blt cr1,L(cacheAligned1)
li rMEMP2,128
L(cacheAlignedx):
cmpldi cr5,rLEN,640
blt cr6,L(cacheAligned128)
bgt cr5,L(cacheAligned512)
cmpldi cr6,rLEN,512
dcbz 0,rMEMP
subf rLEN,rCLS,rLEN
add rMEMP,rMEMP,rCLS
b L(cacheAligned)
cmpldi cr1,rLEN,384
dcbz rMEMP2,rMEMP
addi rMEMP,rMEMP,256
addi rLEN,rLEN,-256
blt cr1,L(cacheAligned1)
blt cr6,L(cacheAligned128)
b L(cacheAligned256)
.align 5
/* A simple loop for the longer (>640 bytes) lengths. This form limits
the branch miss-predicted to exactly 1 at loop exit.*/
L(cacheAligned512):
cmpli cr1,rLEN,128
blt cr1,L(cacheAligned1)
dcbz 0,rMEMP
addi rLEN,rLEN,-128
addi rMEMP,rMEMP,128
b L(cacheAligned512)
.align 5
L(cacheAligned256):
/* We are here because the cache line size was set and was not 32-bytes
and the remainder (rLEN) is less than the actual cache line size.
So set up the preconditions for L(nondcbz) and go there. */
cmpldi cr6,rLEN,512
dcbz 0,rMEMP
cmpldi cr1,rLEN,384
dcbz rMEMP2,rMEMP
addi rMEMP,rMEMP,256
addi rLEN,rLEN,-256
bge cr6,L(cacheAligned256)
blt cr1,L(cacheAligned1)
.align 4
L(cacheAligned128):
dcbz 0,rMEMP
addi rMEMP,rMEMP,128
addi rLEN,rLEN,-128
nop
L(cacheAligned1):
cmpldi cr1,rLEN,32
blt cr1,L(handletail32)
addi rMEMP3,rMEMP,32
addi rLEN,rLEN,-32
std rCHR,0(rMEMP)
std rCHR,8(rMEMP)
std rCHR,16(rMEMP)
addi rMEMP,rMEMP,32
cmpldi cr1,rLEN,32
std rCHR,-8(rMEMP3)
L(cacheAligned2):
blt cr1,L(handletail32)
addi rLEN,rLEN,-32
std rCHR,0(rMEMP3)
std rCHR,8(rMEMP3)
addi rMEMP,rMEMP,32
cmpldi cr1,rLEN,32
std rCHR,16(rMEMP3)
std rCHR,24(rMEMP3)
nop
L(cacheAligned3):
blt cr1,L(handletail32)
addi rMEMP,rMEMP,32
addi rLEN,rLEN,-32
std rCHR,32(rMEMP3)
std rCHR,40(rMEMP3)
std rCHR,48(rMEMP3)
std rCHR,56(rMEMP3)
/* We are here because the length or remainder (rLEN) is less than the
cache line/sector size and does not justify aggressive loop unrolling.
So set up the preconditions for L(medium) and go there. */
.align 3
L(handletail32):
clrrwi. rALIGN, rLEN, 5
b L(nondcbz)
cmpldi cr1,rLEN,0
beqlr cr1
b L(medium)
.align 5
L(small):
@ -237,10 +371,10 @@ L(medium_tail):
bt- 31, L(medium_31t)
bt- 30, L(medium_30t)
L(medium_30f):
bt- 29, L(medium_29t)
bt 29, L(medium_29t)
L(medium_29f):
bge- cr1, L(medium_27t)
bflr- 28
bge cr1, L(medium_27t)
bflr 28
std rCHR, -8(rMEMP)
blr
@ -252,12 +386,12 @@ L(medium_30t):
bf- 29, L(medium_29f)
L(medium_29t):
stwu rCHR, -4(rMEMP)
blt- cr1, L(medium_27f)
blt cr1, L(medium_27f)
L(medium_27t):
std rCHR, -8(rMEMP)
stdu rCHR, -16(rMEMP)
L(medium_27f):
bflr- 28
bflr 28
L(medium_28t):
std rCHR, -8(rMEMP)
blr