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/ppc/floatunditf.c b/lib/ppc/floatunditf.c
new file mode 100644
index 0000000..63f0b44
--- /dev/null
+++ b/lib/ppc/floatunditf.c
@@ -0,0 +1,40 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// long double __floatunditf(unsigned long long x);
+// This file implements the PowerPC unsigned long long -> long double conversion
+
+#include "DD.h"
+#include <stdint.h>
+
+long double __floatunditf(uint64_t a) {
+
+ // Begins with an exact copy of the code from __floatundidf
+
+ static const double twop52 = 0x1.0p52;
+ static const double twop84 = 0x1.0p84;
+ static const double twop84_plus_twop52 = 0x1.00000001p84;
+
+ doublebits high = { .d = twop84 };
+ doublebits low = { .d = twop52 };
+
+ high.x |= a >> 32; // 0x1.0p84 + high 32 bits of a
+ low.x |= a & UINT64_C(0x00000000ffffffff); // 0x1.0p52 + low 32 bits of a
+
+ const double high_addend = high.d - twop84_plus_twop52;
+
+ // At this point, we have two double precision numbers
+ // high_addend and low.d, and we wish to return their sum
+ // as a canonicalized long double:
+
+ // This implementation sets the inexact flag spuriously.
+ // This could be avoided, but at some substantial cost.
+
+ DD result;
+
+ result.hi = high_addend + low.d;
+ result.lo = (high_addend - result.hi) + low.d;
+
+ return result.ld;
+
+}