Creating branches/google/stable and tags/google/stable/2019-05-14 from r360103google/stable

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/google/stable@360714 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 58 insertions, 69 deletions

diff --git a/lib/builtins/floatuntixf.c b/lib/builtins/floatuntixf.c
index ea81cb1bc..efd8a27a0 100644
--- a/lib/builtins/floatuntixf.c
+++ b/lib/builtins/floatuntixf.c
@@ -1,81 +1,70 @@
-/* ===-- floatuntixf.c - Implement __floatuntixf ---------------------------===
- *
- *                     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 __floatuntixf for the compiler_rt library.
- *
- * ===----------------------------------------------------------------------===
- */
+//===-- floatuntixf.c - Implement __floatuntixf ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __floatuntixf for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
 
 #include "int_lib.h"
 
 #ifdef CRT_HAS_128BIT
 
-/* Returns: convert a to a long double, rounding toward even. */
+// 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
- *             tu_int is a 128 bit integral type
- */
+// Assumption: long double is a IEEE 80 bit floating point type padded to 128
+// bits tu_int is a 128 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
- */
+// 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
 
-COMPILER_RT_ABI long double
-__floatuntixf(tu_int a)
-{
-    if (a == 0)
-        return 0.0;
-    const unsigned N = sizeof(tu_int) * CHAR_BIT;
-    int sd = N - __clzti2(a);  /* number of significant digits */
-    int e = sd - 1;             /* exponent */
-    if (sd > LDBL_MANT_DIG)
-    {
-        /*  start:  0000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQxxxxxxxxxxxxxxxxxx
-         *  finish: 000000000000000000000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQR
-         *                                                12345678901234567890123456
-         *  1 = msb 1 bit
-         *  P = bit LDBL_MANT_DIG-1 bits to the right of 1
-         *  Q = bit LDBL_MANT_DIG bits to the right of 1
-         *  R = "or" of all bits to the right of Q
-	 */
-        switch (sd)
-        {
-        case LDBL_MANT_DIG + 1:
-            a <<= 1;
-            break;
-        case LDBL_MANT_DIG + 2:
-            break;
-        default:
-            a = (a >> (sd - (LDBL_MANT_DIG+2))) |
-                ((a & ((tu_int)(-1) >> ((N + LDBL_MANT_DIG+2) - sd))) != 0);
-        };
-        /* finish: */
-        a |= (a & 4) != 0;  /* Or P into R */
-        ++a;  /* round - this step may add a significant bit */
-        a >>= 2;  /* dump Q and R */
-        /* a is now rounded to LDBL_MANT_DIG or LDBL_MANT_DIG+1 bits */
-        if (a & ((tu_int)1 << LDBL_MANT_DIG))
-        {
-            a >>= 1;
-            ++e;
-        }
-        /* a is now rounded to LDBL_MANT_DIG bits */
+COMPILER_RT_ABI long double __floatuntixf(tu_int a) {
+  if (a == 0)
+    return 0.0;
+  const unsigned N = sizeof(tu_int) * CHAR_BIT;
+  int sd = N - __clzti2(a); // number of significant digits
+  int e = sd - 1;           // exponent
+  if (sd > LDBL_MANT_DIG) {
+    //  start:  0000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQxxxxxxxxxxxxxxxxxx
+    //  finish: 000000000000000000000000000000000000001xxxxxxxxxxxxxxxxxxxxxxPQR
+    //                                                12345678901234567890123456
+    //  1 = msb 1 bit
+    //  P = bit LDBL_MANT_DIG-1 bits to the right of 1
+    //  Q = bit LDBL_MANT_DIG bits to the right of 1
+    //  R = "or" of all bits to the right of Q
+    switch (sd) {
+    case LDBL_MANT_DIG + 1:
+      a <<= 1;
+      break;
+    case LDBL_MANT_DIG + 2:
+      break;
+    default:
+      a = (a >> (sd - (LDBL_MANT_DIG + 2))) |
+          ((a & ((tu_int)(-1) >> ((N + LDBL_MANT_DIG + 2) - sd))) != 0);
+    };
+    // finish:
+    a |= (a & 4) != 0; // Or P into R
+    ++a;               // round - this step may add a significant bit
+    a >>= 2;           // dump Q and R
+    // a is now rounded to LDBL_MANT_DIG or LDBL_MANT_DIG+1 bits
+    if (a & ((tu_int)1 << LDBL_MANT_DIG)) {
+      a >>= 1;
+      ++e;
     }
-    else
-    {
-        a <<= (LDBL_MANT_DIG - sd);
-        /* a is now rounded to LDBL_MANT_DIG bits */
-    }
-    long_double_bits fb;
-    fb.u.high.s.low = (e + 16383);                  /* exponent */
-    fb.u.low.all = (du_int)a;                     /* mantissa */
-    return fb.f;
+    // a is now rounded to LDBL_MANT_DIG bits
+  } else {
+    a <<= (LDBL_MANT_DIG - sd);
+    // a is now rounded to LDBL_MANT_DIG bits
+  }
+  long_double_bits fb;
+  fb.u.high.s.low = (e + 16383); // exponent
+  fb.u.low.all = (du_int)a;      // mantissa
+  return fb.f;
 }
 
 #endif