From d7ad9528319596298b80e450e5a2eb87610d2fcf Mon Sep 17 00:00:00 2001
From: Andres Erbsen <andreser@mit.edu>
Date: Sun, 2 Jul 2017 17:09:09 -0400
Subject: automate P256 integration

---
 liblow/cmovznz.c | 10 ++++++++++
 liblow/liblow.h  |  2 ++
 2 files changed, 12 insertions(+)
 create mode 100644 liblow/cmovznz.c
 create mode 100644 liblow/liblow.h

(limited to 'liblow')

diff --git a/liblow/cmovznz.c b/liblow/cmovznz.c
new file mode 100644
index 000000000..8533ade99
--- /dev/null
+++ b/liblow/cmovznz.c
@@ -0,0 +1,10 @@
+#include <stdint.h>
+#include "liblow.h"
+uint64_t cmovznz(uint64_t t, uint64_t z, uint64_t nz) {
+  asm ("testq %1, %1;" "\n"
+  "\t" "cmovnzq %3, %0;"
+      :"=r"(z)
+      :"r"(t), "0"(z), "r"(nz)
+      );
+  return z;
+}
diff --git a/liblow/liblow.h b/liblow/liblow.h
new file mode 100644
index 000000000..a8af0f52f
--- /dev/null
+++ b/liblow/liblow.h
@@ -0,0 +1,2 @@
+#include <stdint.h>
+uint64_t cmovznz(uint64_t t, uint64_t z, uint64_t nz);
-- 
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