From e0fa0b42b2b5e95c81ceff19401c7bb2152dd22a Mon Sep 17 00:00:00 2001 From: Owen Anderson Date: Tue, 23 Jun 2009 21:19:04 +0000 Subject: [PATCH] Add atomic multiply and divide operations, built on top of CompareAndSwap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74004 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/System/Atomic.h | 2 ++ lib/System/Atomic.cpp | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/llvm/System/Atomic.h b/include/llvm/System/Atomic.h index c4049d40da7..4ec117be292 100644 --- a/include/llvm/System/Atomic.h +++ b/include/llvm/System/Atomic.h @@ -27,6 +27,8 @@ namespace llvm { cas_flag AtomicIncrement(volatile cas_flag* ptr); cas_flag AtomicDecrement(volatile cas_flag* ptr); cas_flag AtomicAdd(volatile cas_flag* ptr, cas_flag val); + cas_flag AtomicMul(volatile cas_flag* ptr, cas_flag val); + cas_flag AtomicDiv(volatile cas_flag* ptr, cas_flag val); } } diff --git a/lib/System/Atomic.cpp b/lib/System/Atomic.cpp index 6e751a30d4d..f9b55a186d1 100644 --- a/lib/System/Atomic.cpp +++ b/lib/System/Atomic.cpp @@ -91,4 +91,22 @@ sys::cas_flag sys::AtomicAdd(volatile sys::cas_flag* ptr, sys::cas_flag val) { #endif } +sys::cas_flag sys::AtomicMul(volatile sys::cas_flag* ptr, sys::cas_flag val) { + sys::cas_flag original, result; + do { + original = *ptr; + result = original * val; + } while (sys::CompareAndSwap(ptr, result, original) != original); + return result; +} + +sys::cas_flag sys::AtomicDiv(volatile sys::cas_flag* ptr, sys::cas_flag val) { + sys::cas_flag original, result; + do { + original = *ptr; + result = original / val; + } while (sys::CompareAndSwap(ptr, result, original) != original); + + return result; +} -- 2.11.0