From 4dec4ee174fdfec018cc4f39ef861b8b4725aa75 Mon Sep 17 00:00:00 2001 From: Fabrice Desclaux Date: Fri, 22 May 2020 01:31:22 +0200 Subject: [PATCH] Add divti3 --- miasm/runtime/divti3.c | 35 +++++++++++++++++++++++++++++++++++ setup.py | 1 + 2 files changed, 36 insertions(+) create mode 100644 miasm/runtime/divti3.c diff --git a/miasm/runtime/divti3.c b/miasm/runtime/divti3.c new file mode 100644 index 000000000..4ec3fa35e --- /dev/null +++ b/miasm/runtime/divti3.c @@ -0,0 +1,35 @@ +/* ===-- divti3.c - Implement __divti3 -------------------------------------=== + * + * The LLVM Compiler Infrastructure + * + * This file is dual licensed under the MIT and the University of Illinois Open + * Source Licenses. See LICENSE.TXT for details. + * + * ===----------------------------------------------------------------------=== + * + * This file implements __divti3 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 +__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 */ +} + +#endif diff --git a/setup.py b/setup.py index 4d99a2a13..191778cc0 100644 --- a/setup.py +++ b/setup.py @@ -160,6 +160,7 @@ def buil_all(): ]), Extension("miasm.runtime", ["miasm/runtime/udivmodti4.c", + "miasm/runtime/divti3.c", "miasm/runtime/udivti3.c" ]), ]