The Original Code is Multiple Precision Integer optimization code for

the Compaq Alpha processor.
The Initial Developer of the Original Code is Richard C. Swift.
Portions created by the Initial Developer are Copyright (C) 2001
the Initial Developer. All Rights Reserved.

1 files changed, 214 insertions, 0 deletions

diff --git a/security/nss/lib/freebl/mpi/mpvalpha.c b/security/nss/lib/freebl/mpi/mpvalpha.c
new file mode 100644
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+++ b/security/nss/lib/freebl/mpi/mpvalpha.c
@@ -0,0 +1,214 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Multiple Precision Integer optimization code for 
+ * the Compaq Alpha processor.
+ *
+ * The Initial Developer of the Original Code is
+ * Richard C. Swift.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):	Richard C. Swift	(swift@netscape.com)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "mpi-priv.h"
+#include <c_asm.h>
+
+
+#define MP_MUL_DxD(a, b, Phi, Plo)		\
+ { Plo = asm ("mulq %a0, %a1, %v0", a, b);	\
+   Phi = asm ("umulh %a0, %a1, %v0", a, b); }	\
+
+/* This is empty for the loop in s_mpv_mul_d	*/
+#define CARRY_ADD
+
+#define ONE_MUL				\
+    a_i = *a++;				\
+    MP_MUL_DxD(a_i, b, a1b1, a0b0);	\
+    a0b0 += carry;			\
+    if (a0b0 < carry)			\
+      ++a1b1;				\
+    CARRY_ADD				\
+    *c++ = a0b0;			\
+    carry = a1b1;			\
+
+#define FOUR_MUL			\
+	ONE_MUL				\
+	ONE_MUL				\
+	ONE_MUL				\
+	ONE_MUL				\
+
+#define SIXTEEN_MUL			\
+	FOUR_MUL			\
+	FOUR_MUL			\
+	FOUR_MUL			\
+	FOUR_MUL			\
+
+#define THIRTYTWO_MUL			\
+	SIXTEEN_MUL			\
+	SIXTEEN_MUL			\
+
+#define ONETWENTYEIGHT_MUL		\
+	THIRTYTWO_MUL			\
+	THIRTYTWO_MUL			\
+	THIRTYTWO_MUL			\
+	THIRTYTWO_MUL			\
+
+
+#define EXPAND_256(CALL)		\
+ mp_digit carry = 0;			\
+ mp_digit a_i;				\
+ mp_digit a0b0, a1b1;			\
+ if (a_len &255) {			\
+	if (a_len &1) {			\
+	  ONE_MUL			\
+	}				\
+	if (a_len &2) {			\
+	  ONE_MUL			\
+	  ONE_MUL			\
+	}				\
+	if (a_len &4) {			\
+	  FOUR_MUL			\
+	}				\
+	if (a_len &8) {			\
+	  FOUR_MUL			\
+	  FOUR_MUL			\
+	}				\
+	if (a_len & 16 ) {		\
+	  SIXTEEN_MUL			\
+	}				\
+	if (a_len & 32 ) {		\
+	  THIRTYTWO_MUL			\
+	}				\
+	if (a_len & 64 ) {		\
+	  THIRTYTWO_MUL			\
+	  THIRTYTWO_MUL			\
+	}				\
+	if (a_len & 128) {		\
+	  ONETWENTYEIGHT_MUL		\
+	}				\
+	a_len = a_len & (-256);		\
+  }					\
+  if (a_len>=256 ) {			\
+	carry = CALL(a, a_len, b, c, carry);	\
+	c += a_len;			\
+  }					\
+
+#define FUNC_NAME(NAME)			\
+mp_digit NAME(const mp_digit *a, 	\
+	mp_size a_len,			\
+	mp_digit b, mp_digit *c, 	\
+	mp_digit carry)			\
+
+#define DECLARE_MUL_256(FNAME)		\
+FUNC_NAME(FNAME)			\
+{					\
+  mp_digit a_i;				\
+  mp_digit a0b0, a1b1;			\
+  while (a_len) {			\
+	ONETWENTYEIGHT_MUL		\
+	ONETWENTYEIGHT_MUL		\
+	a_len-= 256;			\
+  }					\
+  return carry;				\
+}					\
+
+/* Expanding the loop in s_mpv_mul_d appeared to slow down the
+   (admittedly) small number of tests (i.e., timetest) used to
+   measure performance, so this define disables that optimization. */
+#define DO_NOT_EXPAND 1
+
+/* Need forward declaration so it can be instantiated after
+	the routine that uses it; this helps locality somewhat	*/
+#if !defined(DO_NOT_EXPAND)
+FUNC_NAME(s_mpv_mul_d_MUL256);
+#endif
+
+/* c = a * b */
+void s_mpv_mul_d(const mp_digit *a, mp_size a_len, 
+			mp_digit b, mp_digit *c)
+{
+#if defined(DO_NOT_EXPAND)
+  mp_digit carry = 0;
+  while (a_len--) {
+    mp_digit a_i = *a++;
+    mp_digit a0b0, a1b1;
+
+    MP_MUL_DxD(a_i, b, a1b1, a0b0);
+
+    a0b0 += carry;
+    if (a0b0 < carry)
+      ++a1b1;
+    *c++ = a0b0;
+    carry = a1b1;
+  }
+#else
+  EXPAND_256(s_mpv_mul_d_MUL256)
+#endif
+  *c = carry;
+}
+
+#if !defined(DO_NOT_EXPAND)
+DECLARE_MUL_256(s_mpv_mul_d_MUL256)
+#endif
+
+#undef CARRY_ADD
+/* This is redefined for the loop in s_mpv_mul_d_add */
+#define CARRY_ADD			\
+    a0b0 += a_i = *c;			\
+    if (a0b0 < a_i)			\
+      ++a1b1;				\
+
+/* Need forward declaration so it can be instantiated between the
+	two routines that use it; this helps locality somewhat	*/
+FUNC_NAME(s_mpv_mul_d_add_MUL256);
+
+/* c += a * b */
+void s_mpv_mul_d_add(const mp_digit *a, mp_size a_len, 
+			mp_digit b, mp_digit *c)
+{
+  EXPAND_256(s_mpv_mul_d_add_MUL256)
+  *c = carry;
+}
+
+/* Instantiate multiply 256 routine here */
+DECLARE_MUL_256(s_mpv_mul_d_add_MUL256)
+
+/* Presently, this is only used by the Montgomery arithmetic code. */
+/* c += a * b */
+void s_mpv_mul_d_add_prop(const mp_digit *a, mp_size a_len, 
+			mp_digit b, mp_digit *c)
+{
+  EXPAND_256(s_mpv_mul_d_add_MUL256)
+  while (carry) {
+    mp_digit c_i = *c;
+    carry += c_i;
+    *c++ = carry;
+    carry = carry < c_i;
+  }
+}
+