Import compiler-rt 10.0.1 release.

ok kettenis@

1 files changed, 62 insertions, 0 deletions

diff --git a/gnu/llvm/compiler-rt/lib/builtins/udivsi3.c b/gnu/llvm/compiler-rt/lib/builtins/udivsi3.c
new file mode 100644
index 00000000000..18cc96c1b2e
--- /dev/null
+++ b/gnu/llvm/compiler-rt/lib/builtins/udivsi3.c
@@ -0,0 +1,62 @@
+//===-- 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
+
+// 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;
+  }
+  q = (q << 1) | carry;
+  return q;
+}
+
+#if defined(__ARM_EABI__)
+COMPILER_RT_ALIAS(__udivsi3, __aeabi_uidiv)
+#endif