Flatten the Curve 448 source structure

[openssl.git] / crypto / ec / curve448 / arch_neon / arch_intrinsics.h

diff --git a/crypto/ec/curve448/arch_neon/arch_intrinsics.h b/crypto/ec/curve448/arch_neon/arch_intrinsics.h
new file mode 100644 (file)
index 0000000..1a1e14b
--- /dev/null
+++ b/crypto/ec/curve448/arch_neon/arch_intrinsics.h
@@ -0,0 +1,24 @@
+/* Copyright (c) 2016 Cryptography Research, Inc.
+ * Released under the MIT License.  See LICENSE.txt for license information.
+ */
+
+#ifndef __ARCH_NEON_ARCH_INTRINSICS_H__
+#define __ARCH_NEON_ARCH_INTRINSICS_H__
+
+#define ARCH_WORD_BITS 32
+
+static __inline__ __attribute((always_inline,unused))
+uint32_t word_is_zero(uint32_t a) {
+    uint32_t ret;
+    __asm__("subs %0, %1, #1;\n\tsbc %0, %0, %0" : "=r"(ret) : "r"(a) : "cc");
+    return ret;
+}
+
+static __inline__ __attribute((always_inline,unused))
+uint64_t widemul(uint32_t a, uint32_t b) {
+    /* Could be UMULL, but it's hard to express to CC that the registers must be different */
+    return ((uint64_t)a) * b; 
+}
+
+#endif /* __ARCH_NEON_ARCH_INTRINSICS_H__ */
+