1 files changed, 65 insertions, 0 deletions
diff --git a/src/math/bigint/mp_ia32/mp_asm.h b/src/math/bigint/mp_ia32/mp_asm.h
new file mode 100644
index 000000000..b45140321
--- /dev/null
+++ b/src/math/bigint/mp_ia32/mp_asm.h
@@ -0,0 +1,65 @@
+/*************************************************
+* Lowest Level MPI Algorithms Header File        *
+* (C) 1999-2008 Jack Lloyd                       *
+*     2006 Luca Piccarreta                       *
+*************************************************/
+
+#ifndef BOTAN_MP_ASM_H__
+#define BOTAN_MP_ASM_H__
+
+#include <botan/mp_types.h>
+
+#if (BOTAN_MP_WORD_BITS != 32)
+   #error The mp_ia32 module requires that BOTAN_MP_WORD_BITS == 32
+#endif
+
+namespace Botan {
+
+extern "C" {
+
+/*************************************************
+* Helper Macros for x86 Assembly                 *
+*************************************************/
+#define ASM(x) x "\n\t"
+
+/*************************************************
+* Word Multiply                                  *
+*************************************************/
+inline word word_madd2(word a, word b, word* c)
+   {
+   asm(
+      ASM("mull %[b]")
+      ASM("addl %[c],%[a]")
+      ASM("adcl $0,%[carry]")
+
+      : [a]"=a"(a), [b]"=rm"(b), [carry]"=&d"(*c)
+      : "0"(a), "1"(b), [c]"g"(*c) : "cc");
+
+   return a;
+   }
+
+/*************************************************
+* Word Multiply/Add                              *
+*************************************************/
+inline word word_madd3(word a, word b, word c, word* d)
+   {
+   asm(
+      ASM("mull %[b]")
+
+      ASM("addl %[c],%[a]")
+      ASM("adcl $0,%[carry]")
+
+      ASM("addl %[d],%[a]")
+      ASM("adcl $0,%[carry]")
+
+      : [a]"=a"(a), [b]"=rm"(b), [carry]"=&d"(*d)
+      : "0"(a), "1"(b), [c]"g"(c), [d]"g"(*d) : "cc");
+
+   return a;
+   }
+
+}
+
+}
+
+#endif