llvmcall2.jl

# This file is a part of Julia. License is MIT: https://julialang.org/license

using InteractiveUtils: code_llvm

function declared_floor(x::Float64)
    return ccall("llvm.floor.f64", llvmcall, Float64, (Float64,), x)
end
@test declared_floor(4.2) == 4.0
ir = sprint(code_llvm, declared_floor, Tuple{Float64})
@test occursin("call double @llvm.floor.f64", ir) # should be inlined

function doubly_declared_floor(x::Float64)
    a = ccall("llvm.floor.f64", llvmcall, Float64, (Float64,), x)
    b = ccall("llvm.floor.f64", llvmcall, Float64, (Float64,), x + 1) - 1
    return a + b
end
@test doubly_declared_floor(4.2) == 8.0

function doubly_declared2_trunc(x::Float64)
    a = ccall("llvm.trunc.f64", llvmcall, Float64, (Float64,), x)
    b = ccall("llvm.trunc.f64", llvmcall, Float64, (Float64,), x + 1) - 1
    return a + b
end
@test doubly_declared2_trunc(4.2) == 8.0

# Test for single line
function declared_ceil(x::Float64)
    return ccall("llvm.ceil.f64", llvmcall, Float64, (Float64,), x)
end
@test declared_ceil(4.2) == 5.0

# Test for multiple lines
function ceilfloor(x::Float64)
    a = ccall("llvm.ceil.f64", llvmcall, Float64, (Float64,), x)
    b = ccall("llvm.floor.f64", llvmcall, Float64, (Float64,), a)
    return b
end
@test ceilfloor(7.4) == 8.0

# support for calling external functions
begin
    f() = ccall("time", llvmcall, Cvoid, (Ptr{Cvoid},), C_NULL)
    @test_throws ErrorException f()
    g() = ccall("extern time", llvmcall, Cvoid, (Ptr{Cvoid},), C_NULL)
    g()
end