275 lines
6.0 KiB
NASM
275 lines
6.0 KiB
NASM
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; Subroutines for out of line prologues and epilogues on for the HPPA
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; Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
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; This file is part of GNU CC.
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; GNU CC is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2, or (at your option)
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; any later version.
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; GNU CC 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
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; GNU General Public License for more details.
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; You should have received a copy of the GNU General Public License
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; along with GNU CC; see the file COPYING. If not, write to
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; the Free Software Foundation, 59 Temple Place - Suite 330,
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; Boston, MA 02111-1307, USA.
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.SPACE $PRIVATE$
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.SUBSPA $DATA$,QUAD=1,ALIGN=8,ACCESS=31
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.SUBSPA $BSS$,QUAD=1,ALIGN=8,ACCESS=31,ZERO,SORT=82
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.SPACE $TEXT$
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.SUBSPA $LIT$,QUAD=0,ALIGN=8,ACCESS=44
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.SUBSPA $CODE$,QUAD=0,ALIGN=8,ACCESS=44,CODE_ONLY
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.SUBSPA $MILLICODE$,QUAD=0,ALIGN=8,ACCESS=44,SORT=8
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; This is an out-of-line prologue.
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;
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; It performs the following operations:
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;
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; * Saves the return pointer at sp - 20
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;
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; * Creates a new stack frame (sp'), size of the frame is passed in %r21
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;
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; * The old stack pointer is saved at sp (frame pointer version only).
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;
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; * Saves grs (passed in low 16 bits of %r22 into the stack frame
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; at sp' + local_fsize (passed in %r19).
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;
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; * Saves frs (passed in high 16 bits of %r22) into the stack
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; frame at sp' + local_fsize (passed in %r19).
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;
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; * Sets up a frame pointer (in %r3) (frame pointer version only).
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;
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; * Returns to the instruction _immediately_ after the call to
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; this function.
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.SPACE $TEXT$
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.SUBSPA $MILLICODE$
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.EXPORT __outline_prologue_fp,MILLICODE
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.align 32
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__outline_prologue_fp
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.PROC
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.CALLINFO FRAME=0,NO_CALLS
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.ENTRY
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copy %r30,%r20
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; Subtract 4 from our return pointer so that we return to
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; the right location.
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ldo -4(%r31),%r31
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; Save off %r2
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stw %r2,-20(0,%r30)
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; Make our new frame.
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add %r21,%r30,%r30
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; Save our old stack pointer.
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stw %r20,0(0,%r20)
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; Add in local_fsize to our frame pointer so we do register
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; saves into the right place
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add %r20,%r19,%r20
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; %r22 tells us what registers we need to save. The upper half
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; is for fp registers, the lower half for integer registers.
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; We put the lower half in %r1 and the upper half into %r22
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; for later use.
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extru %r22,31,16,%r1
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extrs %r22,15,16,%r22
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; %r1 now olds a value 0-18 which corresponds to the number
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; of grs we need to save. We need to reverse that value so
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; we can just into the table and straight-line execute to the
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; end of the gr saves.
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comb,= %r0,%r1,L$0002
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subi 18,%r1,%r1
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blr,n %r1,%r0
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b,n L$0002
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stws,ma %r18,4(0,%r20)
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nop
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stws,ma %r17,4(0,%r20)
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nop
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stws,ma %r16,4(0,%r20)
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nop
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stws,ma %r15,4(0,%r20)
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nop
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stws,ma %r14,4(0,%r20)
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nop
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stws,ma %r13,4(0,%r20)
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nop
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stws,ma %r12,4(0,%r20)
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nop
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stws,ma %r11,4(0,%r20)
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nop
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stws,ma %r10,4(0,%r20)
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nop
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stws,ma %r9,4(0,%r20)
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nop
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stws,ma %r8,4(0,%r20)
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nop
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stws,ma %r7,4(0,%r20)
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nop
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stws,ma %r6,4(0,%r20)
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nop
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stws,ma %r5,4(0,%r20)
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nop
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stws,ma %r4,4(0,%r20)
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nop
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stws,ma %r3,4(0,%r20)
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nop
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L$0002
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; All gr saves are done. Align the temporary frame pointer and
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; do the fr saves.
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ldo 7(%r20),%r20
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depi 0,31,3,%r20
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comb,= %r0,%r22,L$0003
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subi 21,%r22,%r22
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blr,n %r22,%r0
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b,n L$0003
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fstws,ma %fr21,8(0,%r20)
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nop
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fstws,ma %fr20,8(0,%r20)
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nop
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fstws,ma %fr19,8(0,%r20)
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nop
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fstws,ma %fr18,8(0,%r20)
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nop
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fstws,ma %fr17,8(0,%r20)
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nop
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fstws,ma %fr16,8(0,%r20)
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nop
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fstws,ma %fr15,8(0,%r20)
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nop
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fstws,ma %fr14,8(0,%r20)
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nop
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fstws,ma %fr13,8(0,%r20)
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nop
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fstws,ma %fr12,8(0,%r20)
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nop
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L$0003
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; Return, setting up a frame pointer in the delay slot
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bv 0(%r31)
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sub %r30,%r21,%r3
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.EXIT
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.PROCEND
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; This is an out-of-line epilogue. It's operation is basically the reverse
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; of the out-of-line prologue.
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.EXPORT __outline_epilogue_fp,MILLICODE
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.align 32
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__outline_epilogue_fp
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.PROC
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.CALLINFO FRAME=0,NO_CALLS
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.ENTRY
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; Make a copy of our frame pointer into %r20
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copy %r3,%r20
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; Subtract 4 from our return pointer so that we return to
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; the right location.
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ldo -4(%r31),%r31
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; Reload %r2
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; First save off %r2
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ldw -20(0,%r20),%r2
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; Load our old stack pointer, save it in %r21.
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ldw 0(0,%r20),%r21
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; Add in local_fsize (%r19) to the frame pointer to find
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; the saved registers.
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add %r20,%r19,%r20
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; %r22 tells us what registers we need to restore. The upper half
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; is for fp registers, the lower half for integer registers.
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; We put the lower half in %r1 and the upper half into %r22
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; for later use.
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extru %r22,31,16,%r1
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extrs %r22,15,16,%r22
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; %r1 now olds a value 0-18 which corresponds to the number
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; of grs we need to restore. We need to reverse that value so
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; we can just into the table and straight-line execute to the
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; end of the gr restore.
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comb,= %r0,%r1,L$0006
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subi 18,%r1,%r1
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blr,n %r1,%r0
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b,n L$0006
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ldws,ma 4(0,%r20),%r18
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nop
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ldws,ma 4(0,%r20),%r17
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nop
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ldws,ma 4(0,%r20),%r16
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nop
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ldws,ma 4(0,%r20),%r15
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nop
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ldws,ma 4(0,%r20),%r14
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nop
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ldws,ma 4(0,%r20),%r13
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nop
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ldws,ma 4(0,%r20),%r12
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nop
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ldws,ma 4(0,%r20),%r11
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nop
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ldws,ma 4(0,%r20),%r10
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nop
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ldws,ma 4(0,%r20),%r9
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nop
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ldws,ma 4(0,%r20),%r8
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nop
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ldws,ma 4(0,%r20),%r7
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nop
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ldws,ma 4(0,%r20),%r6
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nop
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ldws,ma 4(0,%r20),%r5
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nop
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ldws,ma 4(0,%r20),%r4
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nop
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ldws,ma 4(0,%r20),%r3
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nop
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L$0006
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; All gr restore are done. Align the temporary frame pointer and
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; do the fr restore.
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ldo 7(%r20),%r20
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depi 0,31,3,%r20
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comb,= %r0,%r22,L$0007
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subi 21,%r22,%r22
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blr,n %r22,%r0
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b,n L$0007
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fldws,ma 8(0,%r20),%fr21
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nop
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fldws,ma 8(0,%r20),%fr20
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nop
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fldws,ma 8(0,%r20),%fr19
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nop
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fldws,ma 8(0,%r20),%fr18
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nop
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fldws,ma 8(0,%r20),%fr17
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nop
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fldws,ma 8(0,%r20),%fr16
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nop
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fldws,ma 8(0,%r20),%fr15
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nop
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fldws,ma 8(0,%r20),%fr14
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nop
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fldws,ma 8(0,%r20),%fr13
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nop
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fldws,ma 8(0,%r20),%fr12
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nop
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L$0007
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; Return and deallocate our frame.
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bv 0(%r31)
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copy %r21,%r30
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.EXIT
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.PROCEND
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