c03d0fe672
OpenCL spec restricts that variable in local address space can only be declared at kernel function scope. Add a Clang internal extension __cl_clang_function_scope_local_variables to lift the restriction. To expose static local allocations at kernel scope, targets can either force-inline non-kernel functions that declare local memory or pass a kernel-allocated local buffer to those functions via an implicit argument. Motivation: support local memory allocation in libclc's implementation of work-group collective built-ins, see example at: https://github.com/intel/llvm/blob/41455e305117/libclc/libspirv/lib/amdgcn-amdhsa/group/collectives_helpers.ll https://github.com/intel/llvm/blob/41455e305117/libclc/libspirv/lib/amdgcn-amdhsa/group/collectives.cl#L182 Right now this is a Clang-only OpenCL extension intended for compiling OpenCL libraries with Clang. It could be proposed as a standard OpenCL extension in the future.
20 lines
439 B
Common Lisp
20 lines
439 B
Common Lisp
// RUN: %clang_cc1 %s -triple spir64 -disable-llvm-passes -emit-llvm -o - | FileCheck %s
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#pragma OPENCL EXTENSION __cl_clang_function_scope_local_variables : enable
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void func(local int*);
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void bar() {
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// CHECK: @bar.i = internal addrspace(3) global i32 undef, align 4
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local int i;
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func(&i);
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}
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__kernel void foo(void) {
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// CHECK: @foo.i = internal addrspace(3) global i32 undef, align 4
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{
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local int i;
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func(&i);
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}
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}
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