1 files changed, 28 insertions, 0 deletions
diff --git a/softfloat/s_mul128To256.c b/softfloat/s_mul128To256.c
new file mode 100755
index 0000000..a96cd94
--- /dev/null
+++ b/softfloat/s_mul128To256.c
@@ -0,0 +1,28 @@
+
+#include <stdint.h>
+#include "platform.h"
+#include "primitives.h"
+
+struct uint256
+ softfloat_mul128To256( uint64_t a64, uint64_t a0, uint64_t b64, uint64_t b0 )
+{
+    struct uint128 p0, p64, p128;
+    struct uint256 z;
+
+    p0 = softfloat_mul64To128( a0, b0 );
+    z.v0 = p0.v0;
+    p64 = softfloat_mul64To128( a64, b0 );
+    z.v64 = p64.v0 + p0.v64;
+    z.v128 = p64.v64 + ( z.v64 < p64.v0 );
+    p128 = softfloat_mul64To128( a64, b64 );
+    z.v128 += p128.v0;
+    z.v192 = p128.v64 + ( z.v128 < p128.v0 );
+    p64 = softfloat_mul64To128( a0, b64 );
+    z.v64 += p64.v0;
+    p64.v64 += ( z.v64 < p64.v0 );
+    z.v128 += p64.v64;
+    z.v192 += ( z.v128 < p64.v64 );
+    return z;
+
+}
+