diff options
Diffstat (limited to 'compiler-rt/lib/divti3.c')
| -rw-r--r-- | compiler-rt/lib/divti3.c | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/compiler-rt/lib/divti3.c b/compiler-rt/lib/divti3.c index b8eda254cba..c752f6cfbe9 100644 --- a/compiler-rt/lib/divti3.c +++ b/compiler-rt/lib/divti3.c @@ -1,15 +1,16 @@ -//===-- divti3.c - Implement __divti3 -------------------------------------===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file implements __divti3 for the compiler_rt library. -// -//===----------------------------------------------------------------------===// +/* ===-- divti3.c - Implement __divti3 -------------------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is distributed under the University of Illinois Open Source + * License. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __divti3 for the compiler_rt library. + * + * ===----------------------------------------------------------------------=== + */ #if __x86_64 @@ -17,18 +18,18 @@ tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); -// Returns: a / b +/* Returns: a / b */ ti_int __divti3(ti_int a, ti_int b) { const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; - ti_int s_a = a >> bits_in_tword_m1; // s_a = a < 0 ? -1 : 0 - ti_int s_b = b >> bits_in_tword_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 (__udivmodti4(a, b, (tu_int*)0) ^ s_a) - s_a; // negate if s_a == -1 + ti_int s_a = a >> bits_in_tword_m1; /* s_a = a < 0 ? -1 : 0 */ + ti_int s_b = b >> bits_in_tword_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 (__udivmodti4(a, b, (tu_int*)0) ^ s_a) - s_a; /* negate if s_a == -1 */ } #endif |
