diff options
Diffstat (limited to 'cpukit/compiler-rt/lib/builtins/udivmoddi4.c')
| -rw-r--r-- | cpukit/compiler-rt/lib/builtins/udivmoddi4.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/cpukit/compiler-rt/lib/builtins/udivmoddi4.c b/cpukit/compiler-rt/lib/builtins/udivmoddi4.c new file mode 100644 index 0000000000..123e5fb05f --- /dev/null +++ b/cpukit/compiler-rt/lib/builtins/udivmoddi4.c @@ -0,0 +1,200 @@ +//===-- udivmoddi4.c - Implement __udivmoddi4 -----------------------------===// +// +// 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 __udivmoddi4 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#include "int_lib.h" + +// Effects: if rem != 0, *rem = a % b +// Returns: a / b + +// Translated from Figure 3-40 of The PowerPC Compiler Writer's Guide + +#if defined(_MSC_VER) && !defined(__clang__) +// MSVC throws a warning about mod 0 here, disable it for builds that +// warn-as-error +#pragma warning(push) +#pragma warning(disable : 4723 4724) +#endif + +COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int *rem) { + const unsigned n_uword_bits = sizeof(su_int) * CHAR_BIT; + const unsigned n_udword_bits = sizeof(du_int) * CHAR_BIT; + udwords n; + n.all = a; + udwords d; + d.all = b; + udwords q; + udwords r; + unsigned sr; + // special cases, X is unknown, K != 0 + if (n.s.high == 0) { + if (d.s.high == 0) { + // 0 X + // --- + // 0 X + if (rem) + *rem = n.s.low % d.s.low; + return n.s.low / d.s.low; + } + // 0 X + // --- + // K X + if (rem) + *rem = n.s.low; + return 0; + } + // n.s.high != 0 + if (d.s.low == 0) { + if (d.s.high == 0) { + // K X + // --- + // 0 0 + if (rem) + *rem = n.s.high % d.s.low; + return n.s.high / d.s.low; + } + // d.s.high != 0 + if (n.s.low == 0) { + // K 0 + // --- + // K 0 + if (rem) { + r.s.high = n.s.high % d.s.high; + r.s.low = 0; + *rem = r.all; + } + return n.s.high / d.s.high; + } + // K K + // --- + // K 0 + if ((d.s.high & (d.s.high - 1)) == 0) /* if d is a power of 2 */ { + if (rem) { + r.s.low = n.s.low; + r.s.high = n.s.high & (d.s.high - 1); + *rem = r.all; + } + return n.s.high >> ctzsi(d.s.high); + } + // K K + // --- + // K 0 + sr = clzsi(d.s.high) - clzsi(n.s.high); + // 0 <= sr <= n_uword_bits - 2 or sr large + if (sr > n_uword_bits - 2) { + if (rem) + *rem = n.all; + return 0; + } + ++sr; + // 1 <= sr <= n_uword_bits - 1 + // q.all = n.all << (n_udword_bits - sr); + q.s.low = 0; + q.s.high = n.s.low << (n_uword_bits - sr); + // r.all = n.all >> sr; + r.s.high = n.s.high >> sr; + r.s.low = (n.s.high << (n_uword_bits - sr)) | (n.s.low >> sr); + } else /* d.s.low != 0 */ { + if (d.s.high == 0) { + // K X + // --- + // 0 K + if ((d.s.low & (d.s.low - 1)) == 0) /* if d is a power of 2 */ { + if (rem) + *rem = n.s.low & (d.s.low - 1); + if (d.s.low == 1) + return n.all; + sr = ctzsi(d.s.low); + q.s.high = n.s.high >> sr; + q.s.low = (n.s.high << (n_uword_bits - sr)) | (n.s.low >> sr); + return q.all; + } + // K X + // --- + // 0 K + sr = 1 + n_uword_bits + clzsi(d.s.low) - clzsi(n.s.high); + // 2 <= sr <= n_udword_bits - 1 + // q.all = n.all << (n_udword_bits - sr); + // r.all = n.all >> sr; + if (sr == n_uword_bits) { + q.s.low = 0; + q.s.high = n.s.low; + r.s.high = 0; + r.s.low = n.s.high; + } else if (sr < n_uword_bits) /* 2 <= sr <= n_uword_bits - 1 */ { + q.s.low = 0; + q.s.high = n.s.low << (n_uword_bits - sr); + r.s.high = n.s.high >> sr; + r.s.low = (n.s.high << (n_uword_bits - sr)) | (n.s.low >> sr); + } else /* n_uword_bits + 1 <= sr <= n_udword_bits - 1 */ { + q.s.low = n.s.low << (n_udword_bits - sr); + q.s.high = (n.s.high << (n_udword_bits - sr)) | + (n.s.low >> (sr - n_uword_bits)); + r.s.high = 0; + r.s.low = n.s.high >> (sr - n_uword_bits); + } + } else { + // K X + // --- + // K K + sr = clzsi(d.s.high) - clzsi(n.s.high); + // 0 <= sr <= n_uword_bits - 1 or sr large + if (sr > n_uword_bits - 1) { + if (rem) + *rem = n.all; + return 0; + } + ++sr; + // 1 <= sr <= n_uword_bits + // q.all = n.all << (n_udword_bits - sr); + q.s.low = 0; + if (sr == n_uword_bits) { + q.s.high = n.s.low; + r.s.high = 0; + r.s.low = n.s.high; + } else { + q.s.high = n.s.low << (n_uword_bits - sr); + r.s.high = n.s.high >> sr; + r.s.low = (n.s.high << (n_uword_bits - sr)) | (n.s.low >> sr); + } + } + } + // Not a special case + // q and r are initialized with: + // q.all = n.all << (n_udword_bits - sr); + // r.all = n.all >> sr; + // 1 <= sr <= n_udword_bits - 1 + su_int carry = 0; + for (; sr > 0; --sr) { + // r:q = ((r:q) << 1) | carry + r.s.high = (r.s.high << 1) | (r.s.low >> (n_uword_bits - 1)); + r.s.low = (r.s.low << 1) | (q.s.high >> (n_uword_bits - 1)); + q.s.high = (q.s.high << 1) | (q.s.low >> (n_uword_bits - 1)); + q.s.low = (q.s.low << 1) | carry; + // carry = 0; + // if (r.all >= d.all) + // { + // r.all -= d.all; + // carry = 1; + // } + const di_int s = (di_int)(d.all - r.all - 1) >> (n_udword_bits - 1); + carry = s & 1; + r.all -= d.all & s; + } + q.all = (q.all << 1) | carry; + if (rem) + *rem = r.all; + return q.all; +} + +#if defined(_MSC_VER) && !defined(__clang__) +#pragma warning(pop) +#endif |