c6bfe5c4d7
I've moved the ARM port from ports to the main sysdeps hierarchy. Beyond the README update, the move of the files was simply git mv ports/sysdeps/arm sysdeps/arm git mv ports/sysdeps/unix/arm sysdeps/unix/arm git mv ports/sysdeps/unix/sysv/linux/arm sysdeps/unix/sysv/linux/arm and in addition to the ChangeLog entries here, I put a note at the top of ports/ChangeLog.arm similar to that at the top of ChangeLog.powerpc. There is deliberately no NEWS change, as I think it makes the most sense to put in a general note above all ports having moved if we can achieve that for 2.20. Tested that disassembly of installed shared libraries for arm is the same before and after this patch, except for data (not instructions) in ld.so (there are assertions in sysdeps/arm/dl-machine.h, and the path by which that file is found, and so by which it appears in the assertion message, changes as a result of the move). * sysdeps/arm: Move directory from ports/sysdeps/arm. * sysdeps/unix/arm: Move directory from ports/sysdeps/unix/arm. * sysdeps/unix/sysv/linux/arm: Move directory from ports/sysdeps/unix/sysv/linux/arm. * README: Update listing for arm-*-linux-gnueabi. ports/ChangeLog.arm: * sysdeps/arm: Move directory to ../sysdeps/arm. * sysdeps/unix/arm: Move directory to ../sysdeps.arm. * sysdeps/unix/sysv/linux/arm: Move directory to ../sysdeps/unix/sysv/linux/arm.
100 lines
2.4 KiB
ArmAsm
100 lines
2.4 KiB
ArmAsm
/* mpn_add_n -- add (or subtract) bignums.
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Copyright (C) 2013-2014 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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#include <arm-features.h>
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.syntax unified
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.text
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#ifdef USE_AS_SUB_N
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# define INITC cmp r0, r0
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# define OPC sbcs
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# define RETC sbc r0, r0, r0; neg r0, r0
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# define FUNC __mpn_sub_n
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#else
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# define INITC cmn r0, #0
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# define OPC adcs
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# define RETC mov r0, #0; adc r0, r0, r0
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# define FUNC __mpn_add_n
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#endif
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/* mp_limb_t mpn_add_n(res_ptr, src1_ptr, src2_ptr, size) */
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ENTRY (FUNC)
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push { r4, r5, r6, r7, r8, r10, lr }
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cfi_adjust_cfa_offset (28)
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cfi_rel_offset (r4, 0)
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cfi_rel_offset (r5, 4)
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cfi_rel_offset (r6, 8)
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cfi_rel_offset (r7, 12)
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cfi_rel_offset (r8, 16)
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cfi_rel_offset (r10, 20)
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cfi_rel_offset (lr, 24)
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INITC /* initialize carry flag */
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tst r3, #1 /* count & 1 == 1? */
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add lr, r1, r3, lsl #2 /* compute end src1 */
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beq 1f
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sfi_breg r1, \
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ldr r4, [\B], #4 /* do one to make count even */
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sfi_breg r2, \
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ldr r5, [\B], #4
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OPC r4, r4, r5
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teq r1, lr /* end of count? (preserve carry) */
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sfi_breg r0, \
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str r4, [\B], #4
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beq 9f
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1:
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tst r3, #2 /* count & 2 == 2? */
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beq 2f
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sfi_breg r1, \
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ldm \B!, { r4, r5 } /* do two to make count 0 mod 4 */
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sfi_breg r2, \
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ldm \B!, { r6, r7 }
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OPC r4, r4, r6
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OPC r5, r5, r7
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teq r1, lr /* end of count? */
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sfi_breg r0, \
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stm \B!, { r4, r5 }
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beq 9f
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2:
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sfi_breg r1, \
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ldm \B!, { r3, r5, r7, r10 } /* do four each loop */
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sfi_breg r2, \
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ldm \B!, { r4, r6, r8, ip }
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OPC r3, r3, r4
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OPC r5, r5, r6
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OPC r7, r7, r8
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OPC r10, r10, ip
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teq r1, lr
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sfi_breg r0, \
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stm \B!, { r3, r5, r7, r10 }
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bne 2b
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9:
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RETC /* copy carry out */
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#ifndef ARM_ALWAYS_BX
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pop { r4, r5, r6, r7, r8, r10, pc }
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#else
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pop { r4, r5, r6, r7, r8, r10, lr }
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bx lr
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#endif
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END (FUNC)
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