summaryrefslogtreecommitdiff
path: root/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/k6/mul_1.asm
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/gmp/gmp-6.0.0/mpn/x86/k6/mul_1.asm')
-rw-r--r--Build/source/libs/gmp/gmp-6.0.0/mpn/x86/k6/mul_1.asm292
1 files changed, 292 insertions, 0 deletions
diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/k6/mul_1.asm b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/k6/mul_1.asm
new file mode 100644
index 00000000000..3ef7ec24fe7
--- /dev/null
+++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/k6/mul_1.asm
@@ -0,0 +1,292 @@
+dnl AMD K6 mpn_mul_1 -- mpn by limb multiply.
+
+dnl Copyright 1999, 2000, 2002, 2005 Free Software Foundation, Inc.
+
+dnl This file is part of the GNU MP Library.
+dnl
+dnl The GNU MP Library is free software; you can redistribute it and/or modify
+dnl it under the terms of either:
+dnl
+dnl * the GNU Lesser General Public License as published by the Free
+dnl Software Foundation; either version 3 of the License, or (at your
+dnl option) any later version.
+dnl
+dnl or
+dnl
+dnl * the GNU General Public License as published by the Free Software
+dnl Foundation; either version 2 of the License, or (at your option) any
+dnl later version.
+dnl
+dnl or both in parallel, as here.
+dnl
+dnl The GNU MP Library is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+dnl for more details.
+dnl
+dnl You should have received copies of the GNU General Public License and the
+dnl GNU Lesser General Public License along with the GNU MP Library. If not,
+dnl see https://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+
+C cycles/limb
+C P5
+C P6 model 0-8,10-12 5.5
+C P6 model 9 (Banias)
+C P6 model 13 (Dothan) 4.87
+C P4 model 0 (Willamette)
+C P4 model 1 (?)
+C P4 model 2 (Northwood)
+C P4 model 3 (Prescott)
+C P4 model 4 (Nocona)
+C AMD K6 6.25
+C AMD K7
+C AMD K8
+
+
+C mp_limb_t mpn_mul_1 (mp_ptr dst, mp_srcptr src, mp_size_t size,
+C mp_limb_t multiplier);
+C mp_limb_t mpn_mul_1c (mp_ptr dst, mp_srcptr src, mp_size_t size,
+C mp_limb_t multiplier, mp_limb_t carry);
+C
+C Multiply src,size by mult and store the result in dst,size.
+C Return the carry limb from the top of the result.
+C
+C mpn_mul_1c() accepts an initial carry for the calculation, it's added into
+C the low limb of the result.
+
+defframe(PARAM_CARRY, 20)
+defframe(PARAM_MULTIPLIER,16)
+defframe(PARAM_SIZE, 12)
+defframe(PARAM_SRC, 8)
+defframe(PARAM_DST, 4)
+
+dnl minimum 5 because the unrolled code can't handle less
+deflit(UNROLL_THRESHOLD, 5)
+
+ TEXT
+ ALIGN(32)
+
+PROLOGUE(mpn_mul_1c)
+ pushl %esi
+deflit(`FRAME',4)
+ movl PARAM_CARRY, %esi
+ jmp L(start_nc)
+EPILOGUE()
+
+
+PROLOGUE(mpn_mul_1)
+ push %esi
+deflit(`FRAME',4)
+ xorl %esi, %esi C initial carry
+
+L(start_nc):
+ mov PARAM_SIZE, %ecx
+ push %ebx
+FRAME_pushl()
+
+ movl PARAM_SRC, %ebx
+ push %edi
+FRAME_pushl()
+
+ movl PARAM_DST, %edi
+ pushl %ebp
+FRAME_pushl()
+
+ cmpl $UNROLL_THRESHOLD, %ecx
+ movl PARAM_MULTIPLIER, %ebp
+
+ jae L(unroll)
+
+
+ C code offset 0x22 here, close enough to aligned
+L(simple):
+ C eax scratch
+ C ebx src
+ C ecx counter
+ C edx scratch
+ C esi carry
+ C edi dst
+ C ebp multiplier
+ C
+ C this loop 8 cycles/limb
+
+ movl (%ebx), %eax
+ addl $4, %ebx
+
+ mull %ebp
+
+ addl %esi, %eax
+ movl $0, %esi
+
+ adcl %edx, %esi
+
+ movl %eax, (%edi)
+ addl $4, %edi
+
+ loop L(simple)
+
+
+ popl %ebp
+
+ popl %edi
+ popl %ebx
+
+ movl %esi, %eax
+ popl %esi
+
+ ret
+
+
+C -----------------------------------------------------------------------------
+C The code for each limb is 6 cycles, with instruction decoding being the
+C limiting factor. At 4 limbs/loop and 1 cycle/loop of overhead it's 6.25
+C cycles/limb in total.
+C
+C The secret ingredient to get 6.25 is to start the loop with the mul and
+C have the load/store pair at the end. Rotating the load/store to the top
+C is an 0.5 c/l slowdown. (Some address generation effect probably.)
+C
+C The whole unrolled loop fits nicely in exactly 80 bytes.
+
+
+ ALIGN(16) C already aligned to 16 here actually
+L(unroll):
+ movl (%ebx), %eax
+ leal -16(%ebx,%ecx,4), %ebx
+
+ leal -16(%edi,%ecx,4), %edi
+ subl $4, %ecx
+
+ negl %ecx
+
+
+ ALIGN(16) C one byte nop for this alignment
+L(top):
+ C eax scratch
+ C ebx &src[size-4]
+ C ecx counter
+ C edx scratch
+ C esi carry
+ C edi &dst[size-4]
+ C ebp multiplier
+
+ mull %ebp
+
+ addl %esi, %eax
+ movl $0, %esi
+
+ adcl %edx, %esi
+
+ movl %eax, (%edi,%ecx,4)
+ movl 4(%ebx,%ecx,4), %eax
+
+
+ mull %ebp
+
+ addl %esi, %eax
+ movl $0, %esi
+
+ adcl %edx, %esi
+
+ movl %eax, 4(%edi,%ecx,4)
+ movl 8(%ebx,%ecx,4), %eax
+
+
+ mull %ebp
+
+ addl %esi, %eax
+ movl $0, %esi
+
+ adcl %edx, %esi
+
+ movl %eax, 8(%edi,%ecx,4)
+ movl 12(%ebx,%ecx,4), %eax
+
+
+ mull %ebp
+
+ addl %esi, %eax
+ movl $0, %esi
+
+ adcl %edx, %esi
+
+ movl %eax, 12(%edi,%ecx,4)
+ movl 16(%ebx,%ecx,4), %eax
+
+
+ addl $4, %ecx
+ js L(top)
+
+
+
+ C eax next src limb
+ C ebx &src[size-4]
+ C ecx 0 to 3 representing respectively 4 to 1 further limbs
+ C edx
+ C esi carry
+ C edi &dst[size-4]
+
+ testb $2, %cl
+ jnz L(finish_not_two)
+
+ mull %ebp
+
+ addl %esi, %eax
+ movl $0, %esi
+
+ adcl %edx, %esi
+
+ movl %eax, (%edi,%ecx,4)
+ movl 4(%ebx,%ecx,4), %eax
+
+
+ mull %ebp
+
+ addl %esi, %eax
+ movl $0, %esi
+
+ adcl %edx, %esi
+
+ movl %eax, 4(%edi,%ecx,4)
+ movl 8(%ebx,%ecx,4), %eax
+
+ addl $2, %ecx
+L(finish_not_two):
+
+
+ testb $1, %cl
+ jnz L(finish_not_one)
+
+ mull %ebp
+
+ addl %esi, %eax
+ movl $0, %esi
+
+ adcl %edx, %esi
+
+ movl %eax, 8(%edi)
+ movl 12(%ebx), %eax
+L(finish_not_one):
+
+
+ mull %ebp
+
+ addl %esi, %eax
+ popl %ebp
+
+ adcl $0, %edx
+
+ movl %eax, 12(%edi)
+ popl %edi
+
+ popl %ebx
+ movl %edx, %eax
+
+ popl %esi
+
+ ret
+
+EPILOGUE()