From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 security/nss/lib/freebl/ecl/uint128.c | 87 +++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 security/nss/lib/freebl/ecl/uint128.c

(limited to 'security/nss/lib/freebl/ecl/uint128.c')

diff --git a/security/nss/lib/freebl/ecl/uint128.c b/security/nss/lib/freebl/ecl/uint128.c
new file mode 100644
index 000000000..22cbd023c
--- /dev/null
+++ b/security/nss/lib/freebl/ecl/uint128.c
@@ -0,0 +1,87 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "uint128.h"
+
+/* helper functions */
+uint64_t
+mask51(uint128_t x)
+{
+    return x.lo & MASK51;
+}
+
+uint64_t
+mask_lower(uint128_t x)
+{
+    return x.lo;
+}
+
+uint128_t
+mask51full(uint128_t x)
+{
+    uint128_t ret = { x.lo & MASK51, 0 };
+    return ret;
+}
+
+uint128_t
+init128x(uint64_t x)
+{
+    uint128_t ret = { x, 0 };
+    return ret;
+}
+
+/* arithmetic */
+
+uint128_t
+add128(uint128_t a, uint128_t b)
+{
+    uint128_t ret;
+    ret.lo = a.lo + b.lo;
+    ret.hi = a.hi + b.hi + (ret.lo < b.lo);
+    return ret;
+}
+
+/* out = 19 * a */
+uint128_t
+mul12819(uint128_t a)
+{
+    uint128_t ret = lshift128(a, 4);
+    ret = add128(ret, a);
+    ret = add128(ret, a);
+    ret = add128(ret, a);
+    return ret;
+}
+
+uint128_t
+mul6464(uint64_t a, uint64_t b)
+{
+    uint128_t ret;
+    uint64_t t0 = ((uint64_t)(uint32_t)a) * ((uint64_t)(uint32_t)b);
+    uint64_t t1 = (a >> 32) * ((uint64_t)(uint32_t)b) + (t0 >> 32);
+    uint64_t t2 = (b >> 32) * ((uint64_t)(uint32_t)a) + ((uint32_t)t1);
+    ret.lo = (((uint64_t)((uint32_t)t2)) << 32) + ((uint32_t)t0);
+    ret.hi = (a >> 32) * (b >> 32);
+    ret.hi += (t2 >> 32) + (t1 >> 32);
+    return ret;
+}
+
+/* only defined for n < 64 */
+uint128_t
+rshift128(uint128_t x, uint8_t n)
+{
+    uint128_t ret;
+    ret.lo = (x.lo >> n) + (x.hi << (64 - n));
+    ret.hi = x.hi >> n;
+    return ret;
+}
+
+/* only defined for n < 64 */
+uint128_t
+lshift128(uint128_t x, uint8_t n)
+{
+    uint128_t ret;
+    ret.hi = (x.hi << n) + (x.lo >> (64 - n));
+    ret.lo = x.lo << n;
+    return ret;
+}
-- 
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