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3b473fecdf
This patch cleanups the multiarch bzero for powerpc64 by remove the multiarch objects and use instead the the memset embedded implementation presented in each multiarch optimization. The code generate is essentially the same, but the TB_TOCLESS (which is not essential).
249 lines
6.2 KiB
ArmAsm
249 lines
6.2 KiB
ArmAsm
/* Optimized memset implementation for PowerPC64.
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Copyright (C) 1997-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* __ptr_t [r3] memset (__ptr_t s [r3], int c [r4], size_t n [r5]));
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Returns 's'.
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The memset is done in three sizes: byte (8 bits), word (32 bits),
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cache line (256 bits). There is a special case for setting cache lines
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to 0, to take advantage of the dcbz instruction. */
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.machine power4
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EALIGN (memset, 5, 0)
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CALL_MCOUNT 3
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#define rTMP r0
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#define rRTN r3 /* Initial value of 1st argument. */
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#define rMEMP0 r3 /* Original value of 1st arg. */
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#define rCHR r4 /* Char to set in each byte. */
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#define rLEN r5 /* Length of region to set. */
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#define rMEMP r6 /* Address at which we are storing. */
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#define rALIGN r7 /* Number of bytes we are setting now (when aligning). */
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#define rMEMP2 r8
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#define rNEG64 r8 /* Constant -64 for clearing with dcbz. */
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#define rCLS r8 /* Cache line size obtained from static. */
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#define rCLM r9 /* Cache line size mask to check for cache alignment. */
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L(_memset):
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/* Take care of case for size <= 4. */
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cmpldi cr1, rLEN, 8
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andi. rALIGN, rMEMP0, 7
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mr rMEMP, rMEMP0
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ble- cr1, L(small)
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/* Align to doubleword boundary. */
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cmpldi cr5, rLEN, 31
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insrdi rCHR, rCHR, 8, 48 /* Replicate byte to halfword. */
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beq+ L(aligned2)
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mtcrf 0x01, rMEMP0
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subfic rALIGN, rALIGN, 8
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cror 28,30,31 /* Detect odd word aligned. */
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add rMEMP, rMEMP, rALIGN
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sub rLEN, rLEN, rALIGN
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insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
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bt 29, L(g4)
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/* Process the even word of doubleword. */
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bf+ 31, L(g2)
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stb rCHR, 0(rMEMP0)
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bt 30, L(g4x)
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L(g2):
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sth rCHR, -6(rMEMP)
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L(g4x):
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stw rCHR, -4(rMEMP)
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b L(aligned)
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/* Process the odd word of doubleword. */
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L(g4):
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bf 28, L(g4x) /* If false, word aligned on odd word. */
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bf+ 31, L(g0)
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stb rCHR, 0(rMEMP0)
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bt 30, L(aligned)
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L(g0):
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sth rCHR, -2(rMEMP)
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/* Handle the case of size < 31. */
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L(aligned2):
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insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
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L(aligned):
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mtcrf 0x01, rLEN
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ble cr5, L(medium)
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/* Align to 32-byte boundary. */
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andi. rALIGN, rMEMP, 0x18
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subfic rALIGN, rALIGN, 0x20
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insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
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beq L(caligned)
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mtcrf 0x01, rALIGN
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add rMEMP, rMEMP, rALIGN
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sub rLEN, rLEN, rALIGN
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cmplwi cr1, rALIGN, 0x10
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mr rMEMP2, rMEMP
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bf 28, L(a1)
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stdu rCHR, -8(rMEMP2)
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L(a1): blt cr1, L(a2)
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std rCHR, -8(rMEMP2)
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stdu rCHR, -16(rMEMP2)
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L(a2):
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/* Now aligned to a 32 byte boundary. */
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L(caligned):
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cmpldi cr1, rCHR, 0
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clrrdi. rALIGN, rLEN, 5
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mtcrf 0x01, rLEN
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beq cr1, L(zloopstart) /* Special case for clearing memory using dcbz. */
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L(nondcbz):
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srdi rTMP, rALIGN, 5
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mtctr rTMP
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beq L(medium) /* We may not actually get to do a full line. */
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clrldi. rLEN, rLEN, 59
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add rMEMP, rMEMP, rALIGN
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li rNEG64, -0x40
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bdz L(cloopdone)
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L(c3): dcbtst rNEG64, rMEMP
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std rCHR, -8(rMEMP)
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std rCHR, -16(rMEMP)
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std rCHR, -24(rMEMP)
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stdu rCHR, -32(rMEMP)
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bdnz L(c3)
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L(cloopdone):
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std rCHR, -8(rMEMP)
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std rCHR, -16(rMEMP)
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cmpldi cr1, rLEN, 16
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std rCHR, -24(rMEMP)
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stdu rCHR, -32(rMEMP)
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beqlr
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add rMEMP, rMEMP, rALIGN
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b L(medium_tail2)
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.align 5
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/* Clear lines of memory in 128-byte chunks. */
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L(zloopstart):
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/* If the remaining length is less the 32 bytes, don't bother getting
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the cache line size. */
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beq L(medium)
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li rCLS,128 /* cache line size is 128 */
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/* Now we know the cache line size, and it is not 32-bytes, but
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we may not yet be aligned to the cache line. May have a partial
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line to fill, so touch it 1st. */
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dcbt 0,rMEMP
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L(getCacheAligned):
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cmpldi cr1,rLEN,32
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andi. rTMP,rMEMP,127
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blt cr1,L(handletail32)
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beq L(cacheAligned)
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addi rMEMP,rMEMP,32
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addi rLEN,rLEN,-32
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std rCHR,-32(rMEMP)
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std rCHR,-24(rMEMP)
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std rCHR,-16(rMEMP)
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std rCHR,-8(rMEMP)
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b L(getCacheAligned)
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/* Now we are aligned to the cache line and can use dcbz. */
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L(cacheAligned):
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cmpld cr1,rLEN,rCLS
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blt cr1,L(handletail32)
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dcbz 0,rMEMP
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subf rLEN,rCLS,rLEN
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add rMEMP,rMEMP,rCLS
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b L(cacheAligned)
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/* We are here because the cache line size was set and was not 32-bytes
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and the remainder (rLEN) is less than the actual cache line size.
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So set up the preconditions for L(nondcbz) and go there. */
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L(handletail32):
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clrrwi. rALIGN, rLEN, 5
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b L(nondcbz)
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.align 5
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L(small):
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/* Memset of 8 bytes or less. */
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cmpldi cr6, rLEN, 4
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cmpldi cr5, rLEN, 1
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ble cr6,L(le4)
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subi rLEN, rLEN, 4
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stb rCHR,0(rMEMP)
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stb rCHR,1(rMEMP)
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stb rCHR,2(rMEMP)
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stb rCHR,3(rMEMP)
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addi rMEMP,rMEMP, 4
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cmpldi cr5, rLEN, 1
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L(le4):
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cmpldi cr1, rLEN, 3
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bltlr cr5
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stb rCHR, 0(rMEMP)
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beqlr cr5
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stb rCHR, 1(rMEMP)
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bltlr cr1
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stb rCHR, 2(rMEMP)
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beqlr cr1
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stb rCHR, 3(rMEMP)
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blr
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/* Memset of 0-31 bytes. */
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.align 5
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L(medium):
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insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
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cmpldi cr1, rLEN, 16
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L(medium_tail2):
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add rMEMP, rMEMP, rLEN
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L(medium_tail):
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bt- 31, L(medium_31t)
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bt- 30, L(medium_30t)
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L(medium_30f):
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bt- 29, L(medium_29t)
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L(medium_29f):
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bge- cr1, L(medium_27t)
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bflr- 28
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std rCHR, -8(rMEMP)
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blr
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L(medium_31t):
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stbu rCHR, -1(rMEMP)
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bf- 30, L(medium_30f)
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L(medium_30t):
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sthu rCHR, -2(rMEMP)
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bf- 29, L(medium_29f)
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L(medium_29t):
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stwu rCHR, -4(rMEMP)
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blt- cr1, L(medium_27f)
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L(medium_27t):
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std rCHR, -8(rMEMP)
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stdu rCHR, -16(rMEMP)
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L(medium_27f):
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bflr- 28
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L(medium_28t):
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std rCHR, -8(rMEMP)
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blr
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END_GEN_TB (memset,TB_TOCLESS)
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libc_hidden_builtin_def (memset)
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/* Copied from bzero.S to prevent the linker from inserting a stub
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between bzero and memset. */
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ENTRY (__bzero)
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CALL_MCOUNT 3
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mr r5,r4
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li r4,0
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b L(_memset)
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END (__bzero)
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#ifndef __bzero
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weak_alias (__bzero, bzero)
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#endif
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