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codegen.jl
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codegen.jl
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@testset "LLVM IR" begin
@testset "JuliaLang/julia#21121" begin
function foobar()
weight_matrix = @cuStaticSharedMem(Float32, (16, 16))
sync_threads()
weight_matrix[1, 16] *= 2
sync_threads()
end
ir = sprint(io->CUDA.code_llvm(io, foobar, Tuple{}))
@test !occursin("inttoptr", ir)
end
@testset "PTX TBAA" begin
load(ptr) = unsafe_load(ptr)
store(ptr) = unsafe_store!(ptr, 0)
for f in (load, store)
ir = sprint(io->CUDA.code_llvm(io, f,
Tuple{CUDA.DevicePtr{Float32,AS.Global}};
dump_module=true, raw=true))
@test occursin("gputbaa_global", ir)
# no TBAA on generic pointers
ir = sprint(io->CUDA.code_llvm(io, f,
Tuple{CUDA.DevicePtr{Float32,AS.Generic}};
dump_module=true, raw=true))
@test !occursin("gputbaa", ir)
end
cached_load(ptr) = unsafe_cached_load(ptr)
ir = sprint(io->CUDA.code_llvm(io, cached_load,
Tuple{CUDA.DevicePtr{Float32,AS.Global}};
dump_module=true, raw=true))
@test occursin("gputbaa_global", ir)
end
@testset "ghost values" begin
@eval struct Singleton end
ir = sprint(io->CUDA.code_llvm(io, unsafe_load,
Tuple{CUDA.DevicePtr{Singleton,AS.Global}}))
@test occursin("ret void", ir)
@test unsafe_load(reinterpret(CUDA.DevicePtr{Singleton,AS.Global}, C_NULL)) === Singleton()
ir = sprint(io->CUDA.code_llvm(io, unsafe_store!,
Tuple{CUDA.DevicePtr{Singleton,AS.Global},
Singleton}))
@test !occursin("\bstore\b", ir)
end
@testset "CUDA.jl#553" begin
function kernel(ptr)
unsafe_store!(ptr, CUDA.fma(unsafe_load(ptr), unsafe_load(ptr,2), unsafe_load(ptr,3)))
return
end
ir = sprint(io->CUDA.code_llvm(io, kernel, Tuple{Ptr{Float32}}))
@test !occursin("@__nv_fmaf", ir)
end
@testset "ldg" begin
ir = sprint(io->CUDA.code_llvm(io, CUDA.pointerref_ldg, Tuple{CUDA.DevicePtr{Int,CUDA.AS.Global},Int,Val{1}}))
@test occursin("@llvm.nvvm.ldg", ir)
end
@testset "assume" begin
foo(i) = cld(42, i)
ir = sprint(io->CUDA.code_llvm(io, foo, Tuple{Int}))
@test occursin("@gpu_report_exception", ir)
bar(i) = (CUDA.assume(i > 0); cld(42, i))
ir = sprint(io->CUDA.code_llvm(io, bar, Tuple{Int}))
@test !occursin("gpu_report_exception", ir)
end
@testset "stripping invariant.load" begin
function kernel(ptr, x)
i = CUDA.threadIdx_x()
@inbounds ptr[] = x[i]
return
end
arr = CuArray(zeros(Float64))
@cuda kernel(arr, (1., 2., ))
@test Array(arr)[] == 1.
end
@testset "stripping const TBAA" begin
# this one is particularly nasty because it occurs in a nested function
_a = rand(Int, 2, 1)
b = ((1,9999),(1,9999))
out = CuArray(zeros(Int, 2,1))
a = Tuple(_a)
function kernel(out, a, b)
i = threadIdx().x
blockIdx().x
@inbounds out[i,1] = a[i] + b[i][1]
return
end
@cuda threads=2 kernel(out, a, b)
@test Array(out) == (_a .+ 1)
end
@testset "ptxas-compatible control flow" begin
@noinline function throw_some()
throw(42)
return
end
@inbounds function kernel(input, output, n)
i = threadIdx().x
temp = @cuStaticSharedMem(Int, 1)
if i == 1
1 <= n || throw_some()
temp[1] = input
end
sync_threads()
1 <= n || throw_some()
unsafe_store!(output, temp[1], i)
return
end
function gpu(input)
output = CuArray(zeros(eltype(input), 2))
ptr = pointer(output)
ptr = reinterpret(Ptr{eltype(input)}, ptr)
@cuda threads=2 kernel(input, ptr, 99)
return Array(output)
end
function cpu(input)
output = zeros(eltype(input), 2)
for j in 1:2
@inbounds output[j] = input
end
return output
end
input = rand(1:100)
@test cpu(input) == gpu(input)
end
end
############################################################################################
# NOTE: CUPTI, needed for SASS reflection, does not seem to work under cuda-memcheck
memcheck || @testset "SASS" begin
@testset "basic reflection" begin
valid_kernel() = return
invalid_kernel() = 1
@test CUDA.code_sass(devnull, valid_kernel, Tuple{}) == nothing
@test_throws CUDA.KernelError CUDA.code_sass(devnull, invalid_kernel, Tuple{})
end
@testset "function name mangling" begin
@eval @noinline $(Symbol("dummy_^"))(x) = x
@eval kernel_341(ptr) = (@inbounds unsafe_store!(ptr, $(Symbol("dummy_^"))(unsafe_load(ptr))); nothing)
CUDA.code_sass(devnull, kernel_341, Tuple{Ptr{Int}})
end
end