[llvm-dev] builtins name mangling in SPIR 2.0

[Hongbin Zheng via llvm-dev]

Hi all,

According to the SPIR 2.0 spec[1], the name of OpenCL builtins are mangled.

However, when I compile OpenCl code with Clang 3.9 with the
"spir64-unknown-unknown" target, Clang generates IR without mangling the
builtins, e.g. for:

__kernel void input_zip_int(__global int *in0) {
  *in0 = get_global_id(0);
}

clang generates:

define spir_kernel void @input_zip_int(i32 addrspace(1)* nocapture %in0)
local_unnamed_addr #0 !kernel_arg_addr_space !3 !kernel_arg_access_qual !4
!kernel_arg_type !5 !kernel_arg_base_type !5 !kernel_arg_type_qual !6 {
entry:
  %call = tail call spir_func i128 @get_global_id(i32 0) #2
  %conv = trunc i128 %call to i32
  store i32 %conv, i32 addrspace(1)* %in0, align 4, !tbaa !7
  ret void
}

In this case, get_global_id is not mangled to _Z13get_global_idj according
to [2].

Is there an option for clang or an LLVM clang to do the mangling for spir
builtins?

Thanks
Hongbin


[1] https://www.khronos.org/registry/spir/specs/spir_spec-2.0.pdf, page 36
[2]
https://github.com/KhronosGroup/SPIR-Tools/wiki/SPIR-2.0-built-in-functions
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