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52 lines
1.5 KiB
ArmAsm
52 lines
1.5 KiB
ArmAsm
/* Multiply a limb vector by a single limb, for PowerPC.
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Copyright (C) 1993-2024 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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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* mp_limb_t mpn_submul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr,
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mp_size_t s1_size, mp_limb_t s2_limb)
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Calculate res-s1*s2 and put result back in res; return carry. */
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ENTRY (__mpn_submul_1)
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mtctr r5
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lwz r0,0(r4)
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mullw r7,r0,r6
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mulhwu r10,r0,r6
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lwz r9,0(r3)
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subf r8,r7,r9
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addc r7,r7,r8 # invert cy (r7 is junk)
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addi r3,r3,-4 # adjust res_ptr
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bdz L(1)
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L(0): lwzu r0,4(r4)
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stwu r8,4(r3)
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mullw r8,r0,r6
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adde r7,r8,r10
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mulhwu r10,r0,r6
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lwz r9,4(r3)
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addze r10,r10
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subf r8,r7,r9
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addc r7,r7,r8 # invert cy (r7 is junk)
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bdnz L(0)
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L(1): stw r8,4(r3)
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addze r3,r10
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blr
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END (__mpn_submul_1)
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