diff options
Diffstat (limited to 'lib/divsi3.c')
| -rw-r--r-- | lib/divsi3.c | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/lib/divsi3.c b/lib/divsi3.c index 8d720eb1d..0eff6ef0d 100644 --- a/lib/divsi3.c +++ b/lib/divsi3.c @@ -1,30 +1,31 @@ -//===-- divsi3.c - Implement __divsi3 -------------------------------------===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file implements __divsi3 for the compiler_rt library. -// -//===----------------------------------------------------------------------===// +/* ===-- divsi3.c - Implement __divsi3 -------------------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is distributed under the University of Illinois Open Source + * License. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __divsi3 for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ #include "int_lib.h" su_int __udivsi3(su_int n, su_int d); -// Returns: a / b +/* Returns: a / b */ si_int __divsi3(si_int a, si_int b) { const int bits_in_word_m1 = (int)(sizeof(si_int) * CHAR_BIT) - 1; - si_int s_a = a >> bits_in_word_m1; // s_a = a < 0 ? -1 : 0 - si_int s_b = b >> bits_in_word_m1; // s_b = b < 0 ? -1 : 0 - a = (a ^ s_a) - s_a; // negate if s_a == -1 - b = (b ^ s_b) - s_b; // negate if s_b == -1 - s_a ^= s_b; // sign of quotient - return (__udivsi3(a, b) ^ s_a) - s_a; // negate if s_a == -1 + si_int s_a = a >> bits_in_word_m1; /* s_a = a < 0 ? -1 : 0 */ + si_int s_b = b >> bits_in_word_m1; /* s_b = b < 0 ? -1 : 0 */ + a = (a ^ s_a) - s_a; /* negate if s_a == -1 */ + b = (b ^ s_b) - s_b; /* negate if s_b == -1 */ + s_a ^= s_b; /* sign of quotient */ + return (__udivsi3(a, b) ^ s_a) - s_a; /* negate if s_a == -1 */ } |