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f133d007f9
Old version was from 2012-05-06, 6.1.2 is from 2016-12-16 A lot of support for newer processors and speedups since then See gmp/NEWS for details
131 lines
3.1 KiB
NASM
131 lines
3.1 KiB
NASM
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dnl AMD64 MULX/ADX simulation support.
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dnl Contributed to the GNU project by Torbjörn Granlund.
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dnl Copyright 2013 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of either:
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dnl
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dnl * the GNU Lesser General Public License as published by the Free
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dnl Software Foundation; either version 3 of the License, or (at your
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dnl option) any later version.
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dnl
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dnl or
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dnl
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dnl * the GNU General Public License as published by the Free Software
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dnl Foundation; either version 2 of the License, or (at your option) any
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dnl later version.
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dnl
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dnl or both in parallel, as here.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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dnl for more details.
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dnl
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dnl You should have received copies of the GNU General Public License and the
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dnl GNU Lesser General Public License along with the GNU MP Library. If not,
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dnl see https://www.gnu.org/licenses/.
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include(`../config.m4')
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ASM_START()
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C Fake the MULX instruction
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C
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C Accept the single explicit parameter on the stack, return the two result
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C words on the stack. This calling convention means that we need to move the
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C return address up.
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C
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PROLOGUE(__gmp_mulx)
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lea -8(%rsp), %rsp
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push %rax
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push %rdx
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pushfq C preserve all flags
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mov 32(%rsp), %rax C move retaddr...
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mov %rax, 24(%rsp) C ...up the stack
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mov 40(%rsp), %rax C input parameter
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mul %rdx
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mov %rax, 32(%rsp)
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mov %rdx, 40(%rsp)
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popfq C restore eflags
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pop %rdx
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pop %rax
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ret
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EPILOGUE()
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PROTECT(__gmp_mulx)
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C Fake the ADOX instruction
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C
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C Accept the two parameters on the stack, return the result word on the stack.
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C This calling convention means that we need to move the return address down.
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C
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PROLOGUE(__gmp_adox)
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push %rcx
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push %rbx
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push %rax
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mov 32(%rsp), %rcx C src2
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mov 24(%rsp), %rax C move retaddr...
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mov %rax, 32(%rsp) C ...down the stack
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pushfq
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C copy 0(%rsp):11 to 0(%rsp):0
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mov (%rsp), %rbx
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shr %rbx
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bt $10, %rbx
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adc %rbx, %rbx
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push %rbx
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C put manipulated flags into eflags, execute a plain adc
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popfq
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adc %rcx, 48(%rsp)
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C copy CF to 0(%rsp):11
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pop %rbx
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sbb R32(%rax), R32(%rax)
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and $0x800, R32(%rax)
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and $0xfffffffffffff7ff, %rbx
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or %rax, %rbx
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push %rbx
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C put manipulated flags into eflags
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popfq
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pop %rax
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pop %rbx
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pop %rcx
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lea 8(%rsp), %rsp
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ret
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EPILOGUE()
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PROTECT(__gmp_adox)
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C Fake the ADCX instruction
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C
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C Accept the two parameters on the stack, return the result word on the stack.
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C This calling convention means that we need to move the return address down.
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C
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PROLOGUE(__gmp_adcx)
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push %rcx
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push %rbx
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push %rax
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mov 32(%rsp), %rcx C src2
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mov 24(%rsp), %rax C move retaddr...
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mov %rax, 32(%rsp) C ...down the stack
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pushfq
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adc %rcx, 48(%rsp)
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pop %rbx
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sbb R32(%rax), R32(%rax)
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and $`'0xfffffffffffffffe, %rbx
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sub %rax, %rbx
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push %rbx
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popfq
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pop %rax
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pop %rbx
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pop %rcx
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lea 8(%rsp), %rsp
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ret
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EPILOGUE()
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PROTECT(__gmp_adcx)
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