vendor/compiler-rt/compiler-rt-trunk-r366426

1 files changed, 52 insertions, 58 deletions

diff --git a/lib/builtins/udivsi3.c b/lib/builtins/udivsi3.c
index bb720f8c382b..18cc96c1b2e0 100644
--- a/lib/builtins/udivsi3.c
+++ b/lib/builtins/udivsi3.c
@@ -1,68 +1,62 @@
-/* ===-- udivsi3.c - Implement __udivsi3 -----------------------------------===
- *
- *                     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 __udivsi3 for the compiler_rt library.
- *
- * ===----------------------------------------------------------------------===
- */
+//===-- udivsi3.c - Implement __udivsi3 -----------------------------------===//
+//
+// 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 __udivsi3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
 
 #include "int_lib.h"
 
-/* Returns: a / b */
+// Returns: a / b
 
-/* Translated from Figure 3-40 of The PowerPC Compiler Writer's Guide */
+// Translated from Figure 3-40 of The PowerPC Compiler Writer's Guide
 
-/* This function should not call __divsi3! */
-COMPILER_RT_ABI su_int
-__udivsi3(su_int n, su_int d)
-{
-    const unsigned n_uword_bits = sizeof(su_int) * CHAR_BIT;
-    su_int q;
-    su_int r;
-    unsigned sr;
-    /* special cases */
-    if (d == 0)
-        return 0; /* ?! */
-    if (n == 0)
-        return 0;
-    sr = __builtin_clz(d) - __builtin_clz(n);
-    /* 0 <= sr <= n_uword_bits - 1 or sr large */
-    if (sr > n_uword_bits - 1)  /* d > r */
-        return 0;
-    if (sr == n_uword_bits - 1)  /* d == 1 */
-        return n;
-    ++sr;
-    /* 1 <= sr <= n_uword_bits - 1 */
-    /* Not a special case */
-    q = n << (n_uword_bits - sr);
-    r = n >> sr;
-    su_int carry = 0;
-    for (; sr > 0; --sr)
-    {
-        /* r:q = ((r:q)  << 1) | carry */
-        r = (r << 1) | (q >> (n_uword_bits - 1));
-        q = (q << 1) | carry;
-        /* carry = 0;
-         * if (r.all >= d.all)
-         * {
-         *      r.all -= d.all;
-         *      carry = 1;
-         * }
-         */
-        const si_int s = (si_int)(d - r - 1) >> (n_uword_bits - 1);
-        carry = s & 1;
-        r -= d & s;
-    }
+// This function should not call __divsi3!
+COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d) {
+  const unsigned n_uword_bits = sizeof(su_int) * CHAR_BIT;
+  su_int q;
+  su_int r;
+  unsigned sr;
+  // special cases
+  if (d == 0)
+    return 0; // ?!
+  if (n == 0)
+    return 0;
+  sr = __builtin_clz(d) - __builtin_clz(n);
+  // 0 <= sr <= n_uword_bits - 1 or sr large
+  if (sr > n_uword_bits - 1) // d > r
+    return 0;
+  if (sr == n_uword_bits - 1) // d == 1
+    return n;
+  ++sr;
+  // 1 <= sr <= n_uword_bits - 1
+  // Not a special case
+  q = n << (n_uword_bits - sr);
+  r = n >> sr;
+  su_int carry = 0;
+  for (; sr > 0; --sr) {
+    // r:q = ((r:q)  << 1) | carry
+    r = (r << 1) | (q >> (n_uword_bits - 1));
     q = (q << 1) | carry;
-    return q;
+    // carry = 0;
+    // if (r.all >= d.all)
+    // {
+    //      r.all -= d.all;
+    //      carry = 1;
+    // }
+    const si_int s = (si_int)(d - r - 1) >> (n_uword_bits - 1);
+    carry = s & 1;
+    r -= d & s;
+  }
+  q = (q << 1) | carry;
+  return q;
 }
 
 #if defined(__ARM_EABI__)
-AEABI_RTABI su_int __aeabi_uidiv(su_int n, su_int d) COMPILER_RT_ALIAS(__udivsi3);
+COMPILER_RT_ALIAS(__udivsi3, __aeabi_uidiv)
 #endif