Initial import of compiler-rt.
-
llvm-svn: 74292
diff --git a/compiler-rt/lib/floatdixf.c b/compiler-rt/lib/floatdixf.c
new file mode 100644
index 0000000..8d6911e
--- /dev/null
+++ b/compiler-rt/lib/floatdixf.c
@@ -0,0 +1,43 @@
+//===-- floatdixf.c - Implement __floatdixf -------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __floatdixf for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if !_ARCH_PPC
+
+#include "int_lib.h"
+
+// Returns: convert a to a long double, rounding toward even.
+
+// Assumption: long double is a IEEE 80 bit floating point type padded to 128 bits
+// di_int is a 64 bit integral type
+
+// gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
+// 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
+
+long double
+__floatdixf(di_int a)
+{
+ if (a == 0)
+ return 0.0;
+ const unsigned N = sizeof(di_int) * CHAR_BIT;
+ const di_int s = a >> (N-1);
+ a = (a ^ s) - s;
+ int clz = __builtin_clzll(a);
+ int e = (N - 1) - clz ; // exponent
+ long_double_bits fb;
+ fb.u.high.low = ((su_int)s & 0x00008000) | // sign
+ (e + 16383); // exponent
+ fb.u.low.all = a << clz; // mantissa
+ return fb.f;
+}
+
+#endif