1; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK-SPIRV 2; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unknown-unknown %s -o - -filetype=obj | spirv-val %} 3 4;; This test checks that the backend is capable to correctly translate 5;; atomic_cmpxchg OpenCL C 1.2 built-in function [1] into corresponding SPIR-V 6;; instruction. 7 8;; __kernel void test_atomic_cmpxchg(__global int *p, int cmp, int val) { 9;; atomic_cmpxchg(p, cmp, val); 10;; 11;; __global unsigned int *up = (__global unsigned int *)p; 12;; unsigned int ucmp = (unsigned int)cmp; 13;; unsigned int uval = (unsigned int)val; 14;; atomic_cmpxchg(up, ucmp, uval); 15;; } 16 17; CHECK-SPIRV: OpName %[[#TEST:]] "test_atomic_cmpxchg" 18; CHECK-SPIRV-DAG: %[[#UINT:]] = OpTypeInt 32 0 19; CHECK-SPIRV-DAG: %[[#UINT_PTR:]] = OpTypePointer CrossWorkgroup %[[#UINT]] 20 21;; In SPIR-V, atomic_cmpxchg is represented as OpAtomicCompareExchange [2], 22;; which also includes memory scope and two memory semantic arguments. The 23;; backend applies some default memory order for it and therefore, constants 24;; below include a bit more information than original source 25 26;; 0x2 Workgroup 27; CHECK-SPIRV-DAG: %[[#WORKGROUP_SCOPE:]] = OpConstant %[[#UINT]] 2 28 29;; 0x0 Relaxed 30;; TODO: do we need CrossWorkgroupMemory here as well? 31; CHECK-SPIRV-DAG: %[[#RELAXED:]] = OpConstant %[[#UINT]] 0 32 33; CHECK-SPIRV: %[[#TEST]] = OpFunction %[[#]] 34; CHECK-SPIRV: %[[#PTR:]] = OpFunctionParameter %[[#UINT_PTR]] 35; CHECK-SPIRV: %[[#CMP:]] = OpFunctionParameter %[[#UINT]] 36; CHECK-SPIRV: %[[#VAL:]] = OpFunctionParameter %[[#UINT]] 37; CHECK-SPIRV: %[[#]] = OpAtomicCompareExchange %[[#UINT]] %[[#PTR]] %[[#WORKGROUP_SCOPE]] %[[#RELAXED]] %[[#RELAXED]] %[[#VAL]] %[[#CMP]] 38; CHECK-SPIRV: %[[#]] = OpAtomicCompareExchange %[[#UINT]] %[[#PTR]] %[[#WORKGROUP_SCOPE]] %[[#RELAXED]] %[[#RELAXED]] %[[#VAL]] %[[#CMP]] 39 40define dso_local spir_kernel void @test_atomic_cmpxchg(i32 addrspace(1)* noundef %p, i32 noundef %cmp, i32 noundef %val) local_unnamed_addr { 41entry: 42 %call = tail call spir_func i32 @_Z14atomic_cmpxchgPU3AS1Viii(i32 addrspace(1)* noundef %p, i32 noundef %cmp, i32 noundef %val) 43 %call1 = tail call spir_func i32 @_Z14atomic_cmpxchgPU3AS1Vjjj(i32 addrspace(1)* noundef %p, i32 noundef %cmp, i32 noundef %val) 44 ret void 45} 46 47declare spir_func i32 @_Z14atomic_cmpxchgPU3AS1Viii(i32 addrspace(1)* noundef, i32 noundef, i32 noundef) local_unnamed_addr 48 49declare spir_func i32 @_Z14atomic_cmpxchgPU3AS1Vjjj(i32 addrspace(1)* noundef, i32 noundef, i32 noundef) local_unnamed_addr 50 51;; References: 52;; [1]: https://www.khronos.org/registry/OpenCL/sdk/2.0/docs/man/xhtml/atomic_cmpxchg.html 53;; [2]: https://www.khronos.org/registry/spir-v/specs/unified1/SPIRV.html#OpAtomicCompareExchange 54