[Bug 65873] R600/SI: Cannot select store with truncate to 32-bit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65873

--- Comment #7 from Tom Stellard <tstellar at gmail.com> ---
The SI backend needs to be fixed so it can handle zext i64 loads, but there is
also a bug in libclc.  The vload implementation assumes pointer types are
32-bit:

define <2 x i32> @__clc_vload2_impl_i32__global(i32 %offset,  i32 addrspace(1)*
nocapture %addr) nounwind readonly alwaysinline {
  %1 = ptrtoint i32 addrspace(1)* %addr to i32
  %2 = add i32 %1, %offset
  %3 = inttoptr i32 %2 to <2 x i32> addrspace(1)*
  %4 = load <2 x i32> addrspace(1)* %3, align 4, !tbaa !3
  ret <2 x i32> %4
}

Pointers on SI are 64-bit.  This ptrtoint, add, inttoptr sequence should be
replaced with a getelementptr and a bitcast.

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