--- /dev/null
+dnl AMD64 mpn_mul_1.
+
+dnl Copyright 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
+
+dnl This file is part of the GNU MP Library.
+
+dnl The GNU MP Library is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU Lesser General Public License as published
+dnl by the Free Software Foundation; either version 3 of the License, or (at
+dnl your option) any later version.
+
+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 Lesser General Public
+dnl License for more details.
+
+dnl You should have received a copy of the GNU Lesser General Public License
+dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+C cycles/limb
+C K8,K9: 2.5
+C K10: 2.5
+C P4: 12.3
+C P6-15: 4.0
+C P6-15 (Core2): 4.0
+C P6-28 (Atom): 19.8
+
+C The inner loop of this code is the result of running a code generation and
+C optimization tool suite written by David Harvey and Torbjorn Granlund.
+
+C TODO:
+C * The inner loop is great, but the prologue and epilogue code was
+C quickly written. Tune it!
+
+C INPUT PARAMETERS
+define(`rp', `%rdi')
+define(`up', `%rsi')
+define(`n_param',`%rdx')
+define(`vl', `%rcx')
+
+define(`n', `%r11')
+
+ASM_START()
+ TEXT
+ ALIGN(16)
+PROLOGUE(mpn_mul_1c)
+ push %rbx
+ mov %r8, %r10
+ jmp L(common)
+EPILOGUE()
+
+PROLOGUE(mpn_mul_1)
+ push %rbx
+ xor %r10, %r10
+L(common):
+ mov (up), %rax C read first u limb early
+ mov n_param, %rbx C move away n from rdx, mul uses it
+ mul vl
+ mov %rbx, %r11
+
+ add %r10, %rax
+ adc $0, %rdx
+
+ and $3, R32(%rbx)
+ jz L(b0)
+ cmp $2, R32(%rbx)
+ jz L(b2)
+ jg L(b3)
+
+L(b1): dec n
+ jne L(gt1)
+ mov %rax, (rp)
+ jmp L(ret)
+L(gt1): lea 8(up,n,8), up
+ lea -8(rp,n,8), rp
+ neg n
+ xor %r10, %r10
+ xor R32(%rbx), R32(%rbx)
+ mov %rax, %r9
+ mov (up,n,8), %rax
+ mov %rdx, %r8
+ jmp L(L1)
+
+L(b0): lea (up,n,8), up
+ lea -16(rp,n,8), rp
+ neg n
+ xor %r10, %r10
+ mov %rax, %r8
+ mov %rdx, %rbx
+ jmp L(L0)
+
+L(b3): lea -8(up,n,8), up
+ lea -24(rp,n,8), rp
+ neg n
+ mov %rax, %rbx
+ mov %rdx, %r10
+ jmp L(L3)
+
+L(b2): lea -16(up,n,8), up
+ lea -32(rp,n,8), rp
+ neg n
+ xor %r8, %r8
+ xor R32(%rbx), R32(%rbx)
+ mov %rax, %r10
+ mov 24(up,n,8), %rax
+ mov %rdx, %r9
+ jmp L(L2)
+
+ ALIGN(16)
+L(top): mov %r10, (rp,n,8)
+ add %rax, %r9
+ mov (up,n,8), %rax
+ adc %rdx, %r8
+ mov $0, %r10d
+L(L1): mul vl
+ mov %r9, 8(rp,n,8)
+ add %rax, %r8
+ adc %rdx, %rbx
+L(L0): mov 8(up,n,8), %rax
+ mul vl
+ mov %r8, 16(rp,n,8)
+ add %rax, %rbx
+ adc %rdx, %r10
+L(L3): mov 16(up,n,8), %rax
+ mul vl
+ mov %rbx, 24(rp,n,8)
+ mov $0, %r8d # zero
+ mov %r8, %rbx # zero
+ add %rax, %r10
+ mov 24(up,n,8), %rax
+ mov %r8, %r9 # zero
+ adc %rdx, %r9
+L(L2): mul vl
+ add $4, n
+ js L(top)
+
+ mov %r10, (rp,n,8)
+ add %rax, %r9
+ adc %r8, %rdx
+ mov %r9, 8(rp,n,8)
+ add %r8, %rdx
+L(ret): mov %rdx, %rax
+
+ pop %rbx
+ ret
+EPILOGUE()
projects / msp430-gcc.git / blobdiff