Initial import of compiler-rt.
-
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/muldi3.c b/lib/muldi3.c
new file mode 100644
index 0000000..98299e6
--- /dev/null
+++ b/lib/muldi3.c
@@ -0,0 +1,53 @@
+//===-- muldi3.c - Implement __muldi3 -------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __muldi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+// Returns: a * b
+
+static
+di_int
+__muldsi3(su_int a, su_int b)
+{
+ dwords r;
+ const int bits_in_word_2 = (int)(sizeof(si_int) * CHAR_BIT) / 2;
+ const su_int lower_mask = (su_int)~0 >> bits_in_word_2;
+ r.low = (a & lower_mask) * (b & lower_mask);
+ su_int t = r.low >> bits_in_word_2;
+ r.low &= lower_mask;
+ t += (a >> bits_in_word_2) * (b & lower_mask);
+ r.low += (t & lower_mask) << bits_in_word_2;
+ r.high = t >> bits_in_word_2;
+ t = r.low >> bits_in_word_2;
+ r.low &= lower_mask;
+ t += (b >> bits_in_word_2) * (a & lower_mask);
+ r.low += (t & lower_mask) << bits_in_word_2;
+ r.high += t >> bits_in_word_2;
+ r.high += (a >> bits_in_word_2) * (b >> bits_in_word_2);
+ return r.all;
+}
+
+// Returns: a * b
+
+di_int
+__muldi3(di_int a, di_int b)
+{
+ dwords x;
+ x.all = a;
+ dwords y;
+ y.all = b;
+ dwords r;
+ r.all = __muldsi3(x.low, y.low);
+ r.high += x.high * y.low + x.low * y.high;
+ return r.all;
+}