diff options
author | Thomas Voss <mail@thomasvoss.com> | 2024-06-21 23:36:36 +0200 |
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committer | Thomas Voss <mail@thomasvoss.com> | 2024-06-21 23:42:26 +0200 |
commit | a89a14ef5da44684a16b204e7a70460cc8c4922a (patch) | |
tree | b23b4c6b155977909ef508fdae2f48d33d802813 /vendor/gmp-6.3.0/mpn/x86/pentium4/copyd.asm | |
parent | 1db63fcedab0b288820d66e100b1877b1a5a8851 (diff) |
Basic constant folding implementation
Diffstat (limited to 'vendor/gmp-6.3.0/mpn/x86/pentium4/copyd.asm')
-rw-r--r-- | vendor/gmp-6.3.0/mpn/x86/pentium4/copyd.asm | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/vendor/gmp-6.3.0/mpn/x86/pentium4/copyd.asm b/vendor/gmp-6.3.0/mpn/x86/pentium4/copyd.asm new file mode 100644 index 0000000..82af81c --- /dev/null +++ b/vendor/gmp-6.3.0/mpn/x86/pentium4/copyd.asm @@ -0,0 +1,71 @@ +dnl Pentium-4 mpn_copyd -- copy limb vector, decrementing. + +dnl Copyright 1999-2001 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/. + + +dnl The std/rep/movsl/cld is very slow for small blocks on pentium4. Its +dnl startup time seems to be about 165 cycles. It then needs 2.6 c/l. +dnl We therefore use an open-coded 2 c/l copying loop. + +dnl Ultimately, we may want to use 64-bit movq or 128-bit movdqu in some +dnl nifty unrolled arrangement. Clearly, that could reach much higher +dnl speeds, at least for large blocks. + +include(`../config.m4') + + +defframe(PARAM_SIZE, 12) +defframe(PARAM_SRC, 8) +defframe(PARAM_DST, 4) + + TEXT + ALIGN(8) + +PROLOGUE(mpn_copyd) +deflit(`FRAME',0) + + movl PARAM_SIZE, %ecx + + movl PARAM_SRC, %eax + movl PARAM_DST, %edx + movl %ebx, PARAM_SIZE + addl $-1, %ecx + js L(end) + +L(loop): + movl (%eax,%ecx,4), %ebx + movl %ebx, (%edx,%ecx,4) + addl $-1, %ecx + + jns L(loop) +L(end): + movl PARAM_SIZE, %ebx + ret + +EPILOGUE() |