1 files changed, 112 insertions, 0 deletions
diff --git a/libotr/libgcrypt-1.8.7/mpi/pentium4/sse2/mpih-sub1.S b/libotr/libgcrypt-1.8.7/mpi/pentium4/sse2/mpih-sub1.S
new file mode 100644
index 0000000..33900c7
--- /dev/null
+++ b/libotr/libgcrypt-1.8.7/mpi/pentium4/sse2/mpih-sub1.S
@@ -0,0 +1,112 @@
+/* Intel Pentium-4 mpn_sub_n -- mpn subtraction.
+ *
+ * Copyright 2001, 2002 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ *	 Actually it's the same code with only minor changes in the
+ *	 way the data is stored; this is to support the abstraction
+ *	 of an optional secure memory allocation which may be used
+ *	 to avoid revealing of sensitive data due to paging etc.
+ */
+
+
+#include "sysdep.h"
+#include "asm-syntax.h"
+
+
+/*******************
+ *  mpi_limb_t
+ *  _gcry_mpih_sub_n( mpi_ptr_t res_ptr,	(sp + 4)
+ *		   mpi_ptr_t s1_ptr,	(sp + 8)
+ *		   mpi_ptr_t s2_ptr,	(sp + 12)
+ *		   mpi_size_t size)	(sp + 16)
+ *
+ * P4 Willamette, Northwood: 4.0 cycles/limb if dst!=src1 and dst!=src2
+ *			     6.0 cycles/limb if dst==src1 or dst==src2
+ * P4 Prescott:		     >= 5 cycles/limb
+ *
+ * The main loop code is 2x unrolled so that the carry bit can alternate
+ * between mm0 and mm1.
+ */
+
+
+.text
+	ALIGN (3)
+	.globl C_SYMBOL_NAME(_gcry_mpih_sub_n)
+C_SYMBOL_NAME(_gcry_mpih_sub_n:)
+
+	pxor	%mm0, %mm0
+.Lstart_nc:
+	movl	8(%esp), %eax
+	movl	%ebx, 8(%esp)
+	movl	12(%esp), %ebx
+	movl	4(%esp), %edx
+	movl	16(%esp), %ecx
+
+	leal	(%eax,%ecx,4), %eax	
+	leal	(%ebx,%ecx,4), %ebx	
+	leal	(%edx,%ecx,4), %edx	
+	negl	%ecx			
+
+.Ltop:
+/*
+	C eax	src1 end
+	C ebx	src2 end
+	C ecx	counter, limbs, negative
+	C edx	dst end
+	C mm0	carry bit
+*/
+
+	movd	(%eax,%ecx,4), %mm1
+	movd	(%ebx,%ecx,4), %mm2
+	psubq	%mm2, %mm1
+
+	psubq	%mm0, %mm1
+	movd	%mm1, (%edx,%ecx,4)
+
+	psrlq	$63, %mm1
+
+	addl	$1, %ecx
+	jz	.Ldone_mm1
+
+	movd	(%eax,%ecx,4), %mm0
+	movd	(%ebx,%ecx,4), %mm2
+	psubq	%mm2, %mm0
+
+	psubq	%mm1, %mm0
+	movd	%mm0, (%edx,%ecx,4)
+
+	psrlq	$63, %mm0
+
+	addl	$1, %ecx
+	jnz	.Ltop
+
+
+	movd	%mm0, %eax
+	movl	8(%esp), %ebx
+	emms
+	ret
+
+
+
+.Ldone_mm1:
+	movd	%mm1, %eax
+	movl	8(%esp), %ebx
+	emms
+	ret