C reference implementation of the int64 helper functions.

In test_int64.c: don't test FP->int64 conversions when the FP argument is out of range.

1 files changed, 55 insertions, 0 deletions

diff --git a/runtime/c/i64_shl.c b/runtime/c/i64_shl.c
new file mode 100644
index 00000000..9b9aae57
--- /dev/null
+++ b/runtime/c/i64_shl.c
@@ -0,0 +1,55 @@
+/*****************************************************************
+ *
+ *               The Compcert verified compiler
+ *
+ *           Xavier Leroy, INRIA Paris-Rocquencourt
+ *
+ * Copyright (c) 2013 Institut National de Recherche en Informatique et
+ *  en Automatique.
+ *
+ * Redistribution and use in source and binary forms, with or without
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+ *     * Neither the name of the <organization> nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+ **********************************************************************/
+
+/* Helper functions for 64-bit integer arithmetic. Reference C implementation */
+
+#include "i64.h"
+
+/* Shift left */
+
+unsigned long long __i64_shl(unsigned long long x, int amount)
+{
+  unsigned xl = x, xh = x >> 32;
+  amount = amount & 63;
+  if (amount == 0) {
+    return x;
+  }
+  else if (amount < 32) {
+    unsigned rl = xl << amount;
+    unsigned rh = (xh << amount) | (xl >> (32 - amount));
+    return rl | ((unsigned long long) rh << 32);
+  } else {
+    return ((unsigned long long) (xl << (amount - 32))) << 32;
+  }
+}