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Diffstat (limited to 'lib/divdi3.c')
-rw-r--r-- | lib/divdi3.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/lib/divdi3.c b/lib/divdi3.c new file mode 100644 index 000000000..9580156b9 --- /dev/null +++ b/lib/divdi3.c @@ -0,0 +1,30 @@ +//===-- divdi3.c - Implement __divdi3 -------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __divdi3 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#include "int_lib.h" + +du_int __udivmoddi4(du_int a, du_int b, du_int* rem); + +// Returns: a / b + +di_int +__divdi3(di_int a, di_int b) +{ + 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_a ^= s_b; // sign of quotient + return (__udivmoddi4(a, b, (du_int*)0) ^ s_a) - s_a; // negate if s_a == -1 +} |