vendor/compiler-rt/compiler-rt-r224034

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/builtins/floatunsidf.c b/lib/builtins/floatunsidf.c
new file mode 100644
index 0000000000000..445e18041c483
--- /dev/null
+++ b/lib/builtins/floatunsidf.c
@@ -0,0 +1,42 @@
+//===-- lib/floatunsidf.c - uint -> double-precision conversion ---*- C -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements unsigned integer to double-precision conversion for the
+// compiler-rt library in the IEEE-754 default round-to-nearest, ties-to-even
+// mode.
+//
+//===----------------------------------------------------------------------===//
+
+#define DOUBLE_PRECISION
+#include "fp_lib.h"
+
+#include "int_lib.h"
+
+ARM_EABI_FNALIAS(ui2d, floatunsidf)
+
+COMPILER_RT_ABI fp_t
+__floatunsidf(unsigned int a) {
+    
+    const int aWidth = sizeof a * CHAR_BIT;
+    
+    // Handle zero as a special case to protect clz
+    if (a == 0) return fromRep(0);
+    
+    // Exponent of (fp_t)a is the width of abs(a).
+    const int exponent = (aWidth - 1) - __builtin_clz(a);
+    rep_t result;
+    
+    // Shift a into the significand field and clear the implicit bit.
+    const int shift = significandBits - exponent;
+    result = (rep_t)a << shift ^ implicitBit;
+    
+    // Insert the exponent
+    result += (rep_t)(exponent + exponentBias) << significandBits;
+    return fromRep(result);
+}