diff options
Diffstat (limited to 'contrib/llvm-project/compiler-rt/lib/builtins/divmoddi4.c')
| -rw-r--r-- | contrib/llvm-project/compiler-rt/lib/builtins/divmoddi4.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/divmoddi4.c b/contrib/llvm-project/compiler-rt/lib/builtins/divmoddi4.c index 7f333510c003..e7cbbb1aaa30 100644 --- a/contrib/llvm-project/compiler-rt/lib/builtins/divmoddi4.c +++ b/contrib/llvm-project/compiler-rt/lib/builtins/divmoddi4.c @@ -15,7 +15,14 @@ // Returns: a / b, *rem = a % b COMPILER_RT_ABI di_int __divmoddi4(di_int a, di_int b, di_int *rem) { - di_int d = __divdi3(a, b); - *rem = a - (d * b); - return d; + const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1; + di_int s_a = a >> bits_in_dword_m1; // s_a = a < 0 ? -1 : 0 + di_int s_b = b >> bits_in_dword_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_b ^= s_a; // sign of quotient + du_int r; + di_int q = (__udivmoddi4(a, b, &r) ^ s_b) - s_b; // negate if s_b == -1 + *rem = (r ^ s_a) - s_a; // negate if s_a == -1 + return q; } |