Hello,
I’m trying to generate some LLVM IR that uses the constant memory address space. A very simple program aborts from LLVM with the following: LLVM ERROR: Cannot cast between two non-generic address spaces.
Here’s the program I’m trying to build:
; Function Attrs: nounwind
define void @kernel_blur1_s1_x___block_id_x(i32 %blur1.min.0, i32 %“blur1.s1.tent.x$r”, i8 addrspace(1)* noalias nocapture %blur1.host, i8 addrspace(1)* noalias nocapture readonly %input.host, i8 addrspace(4)* noalias nocapture readonly %tent.host) #1 {
entry:
%blur1.s1.x.__block_id_x = tail call i32 @llvm.nvvm.read.ptx.sreg.ctaid.x() #0
%.__thread_id_x = tail call i32 @llvm.nvvm.read.ptx.sreg.tid.x() #0
%0 = shl i32 %blur1.s1.x.__block_id_x, 4
%1 = add nsw i32 %0, %blur1.min.0
%2 = add nsw i32 %1, %.__thread_id_x
%3 = sub i32 %“blur1.s1.tent.x$r”, %blur1.min.0
%4 = add i32 %3, %2
%5 = bitcast i8 addrspace(1)* %input.host to i16 addrspace(1)*
%6 = sext i32 %4 to i64
%7 = getelementptr inbounds i16, i16 addrspace(1)* %5, i64 %6
%8 = load i16, i16 addrspace(1)* %7, align 2, !tbaa !8
%9 = bitcast i8 addrspace(4)* %tent.host to i16 addrspace(4)*
%10 = sext i32 %“blur1.s1.tent.x$r” to i64
%11 = getelementptr inbounds i16, i16 addrspace(4)* %9, i64 %10
%12 = load i16, i16 addrspace(4)* %11, align 2, !tbaa !9
%13 = mul i16 %12, %8
%14 = sub nsw i32 %2, %blur1.min.0
%15 = bitcast i8 addrspace(1)* %blur1.host to i16 addrspace(1)*
%16 = sext i32 %14 to i64
%17 = getelementptr inbounds i16, i16 addrspace(1)* %15, i64 %16
%18 = load i16, i16 addrspace(1)* %17, align 2, !tbaa !6
%19 = add i16 %18, %13
store i16 %19, i16 addrspace(1)* %17, align 2, !tbaa !6
ret void
}
The program looks correct to me w.r.t. address spaces. The error seems to come from NVPTXDAGToDAGISel::SelectAddrSpaceCast, but I don’t believe the program needs or uses any address space casts?
Please let me know if I’m missing any information you need to help diagnose the problem!
Thanks,
Dillon