From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001
From: Duncan Wilkie <antigravityd@gmail.com>
Date: Sat, 18 Nov 2023 06:11:09 -0600
Subject: Initial commit.

---
 gmp-6.3.0/mpn/x86/pentium4/copyd.asm | 71 ++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 gmp-6.3.0/mpn/x86/pentium4/copyd.asm

(limited to 'gmp-6.3.0/mpn/x86/pentium4/copyd.asm')

diff --git a/gmp-6.3.0/mpn/x86/pentium4/copyd.asm b/gmp-6.3.0/mpn/x86/pentium4/copyd.asm
new file mode 100644
index 0000000..82af81c
--- /dev/null
+++ b/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()
-- 
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