llvm/test/Assembler/atomic.ll
Konstantin Zhuravlyov 8f85685860 Enhance synchscope representation
OpenCL 2.0 introduces the notion of memory scopes in atomic operations to
  global and local memory. These scopes restrict how synchronization is
  achieved, which can result in improved performance.

  This change extends existing notion of synchronization scopes in LLVM to
  support arbitrary scopes expressed as target-specific strings, in addition to
  the already defined scopes (single thread, system).

  The LLVM IR and MIR syntax for expressing synchronization scopes has changed
  to use *syncscope("<scope>")*, where <scope> can be "singlethread" (this
  replaces *singlethread* keyword), or a target-specific name. As before, if
  the scope is not specified, it defaults to CrossThread/System scope.

  Implementation details:
    - Mapping from synchronization scope name/string to synchronization scope id
      is stored in LLVM context;
    - CrossThread/System and SingleThread scopes are pre-defined to efficiently
      check for known scopes without comparing strings;
    - Synchronization scope names are stored in SYNC_SCOPE_NAMES_BLOCK in
      the bitcode.

Differential Revision: https://reviews.llvm.org/D21723



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307722 91177308-0d34-0410-b5e6-96231b3b80d8
2017-07-11 22:23:00 +00:00

42 lines
2.2 KiB
LLVM

; RUN: opt < %s | opt -S | FileCheck %s
; RUN: verify-uselistorder %s
; Basic smoke test for atomic operations.
define void @f(i32* %x) {
; CHECK: load atomic i32, i32* %x unordered, align 4
load atomic i32, i32* %x unordered, align 4
; CHECK: load atomic volatile i32, i32* %x syncscope("singlethread") acquire, align 4
load atomic volatile i32, i32* %x syncscope("singlethread") acquire, align 4
; CHECK: load atomic volatile i32, i32* %x syncscope("agent") acquire, align 4
load atomic volatile i32, i32* %x syncscope("agent") acquire, align 4
; CHECK: store atomic i32 3, i32* %x release, align 4
store atomic i32 3, i32* %x release, align 4
; CHECK: store atomic volatile i32 3, i32* %x syncscope("singlethread") monotonic, align 4
store atomic volatile i32 3, i32* %x syncscope("singlethread") monotonic, align 4
; CHECK: store atomic volatile i32 3, i32* %x syncscope("workgroup") monotonic, align 4
store atomic volatile i32 3, i32* %x syncscope("workgroup") monotonic, align 4
; CHECK: cmpxchg i32* %x, i32 1, i32 0 syncscope("singlethread") monotonic monotonic
cmpxchg i32* %x, i32 1, i32 0 syncscope("singlethread") monotonic monotonic
; CHECK: cmpxchg i32* %x, i32 1, i32 0 syncscope("workitem") monotonic monotonic
cmpxchg i32* %x, i32 1, i32 0 syncscope("workitem") monotonic monotonic
; CHECK: cmpxchg volatile i32* %x, i32 0, i32 1 acq_rel acquire
cmpxchg volatile i32* %x, i32 0, i32 1 acq_rel acquire
; CHECK: cmpxchg i32* %x, i32 42, i32 0 acq_rel monotonic
cmpxchg i32* %x, i32 42, i32 0 acq_rel monotonic
; CHECK: cmpxchg weak i32* %x, i32 13, i32 0 seq_cst monotonic
cmpxchg weak i32* %x, i32 13, i32 0 seq_cst monotonic
; CHECK: atomicrmw add i32* %x, i32 10 seq_cst
atomicrmw add i32* %x, i32 10 seq_cst
; CHECK: atomicrmw volatile xchg i32* %x, i32 10 monotonic
atomicrmw volatile xchg i32* %x, i32 10 monotonic
; CHECK: atomicrmw volatile xchg i32* %x, i32 10 syncscope("agent") monotonic
atomicrmw volatile xchg i32* %x, i32 10 syncscope("agent") monotonic
; CHECK: fence syncscope("singlethread") release
fence syncscope("singlethread") release
; CHECK: fence seq_cst
fence seq_cst
; CHECK: fence syncscope("device") seq_cst
fence syncscope("device") seq_cst
ret void
}