From b3a6901e66f55b35aa9e01bcb24134e6a65ea004 Mon Sep 17 00:00:00 2001 From: Daniel Dunbar Date: Fri, 26 Jun 2009 16:47:03 +0000 Subject: Initial import of compiler-rt. - git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/modti3.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 lib/modti3.c (limited to 'lib/modti3.c') diff --git a/lib/modti3.c b/lib/modti3.c new file mode 100644 index 00000000..91ff8aa5 --- /dev/null +++ b/lib/modti3.c @@ -0,0 +1,35 @@ +//===-- modti3.c - Implement __modti3 -------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements __modti3 for the compiler_rt library. +// +//===----------------------------------------------------------------------===// + +#if __x86_64 + +#include "int_lib.h" + +tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem); + +// Returns: a % b + +ti_int +__modti3(ti_int a, ti_int b) +{ + const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1; + ti_int s = b >> bits_in_tword_m1; // s = b < 0 ? -1 : 0 + b = (b ^ s) - s; // negate if s == -1 + s = a >> bits_in_tword_m1; // s = a < 0 ? -1 : 0 + a = (a ^ s) - s; // negate if s == -1 + ti_int r; + __udivmodti4(a, b, (tu_int*)&r); + return (r ^ s) - s; // negate if s == -1 +} + +#endif -- cgit v1.2.3