[mlir][ptr] Add load and store ops. (#156093)
This patch adds the load and store operations to the ptr dialect. It's
future work to implement SROA and Mem2Reg interfaces, as well as
conversion to LLVM, and add alias information.
This patch also fixes a bug in `OptionalProp` that was causing the
bytecode writer to exit early of writing the Op props if an optional
prop had the default value.
Example:
```mlir
func.func @load_ops(%arg0: !ptr.ptr<#ptr.generic_space>) -> (f32, f32, f32, f32, f32, i64, i32) {
%0 = ptr.load %arg0 : !ptr.ptr<#ptr.generic_space> -> f32
%1 = ptr.load volatile %arg0 : !ptr.ptr<#ptr.generic_space> -> f32
%2 = ptr.load %arg0 nontemporal : !ptr.ptr<#ptr.generic_space> -> f32
%3 = ptr.load %arg0 invariant : !ptr.ptr<#ptr.generic_space> -> f32
%4 = ptr.load %arg0 invariant_group : !ptr.ptr<#ptr.generic_space> -> f32
%5 = ptr.load %arg0 atomic monotonic alignment = 8 : !ptr.ptr<#ptr.generic_space> -> i64
%6 = ptr.load volatile %arg0 atomic syncscope("workgroup") acquire nontemporal alignment = 4 : !ptr.ptr<#ptr.generic_space> -> i32
return %0, %1, %2, %3, %4, %5, %6 : f32, f32, f32, f32, f32, i64, i32
}
func.func @store_ops(%arg0: !ptr.ptr<#ptr.generic_space>, %arg1: f32, %arg2: i64, %arg3: i32) {
ptr.store %arg1, %arg0 : f32, !ptr.ptr<#ptr.generic_space>
ptr.store volatile %arg1, %arg0 : f32, !ptr.ptr<#ptr.generic_space>
ptr.store %arg1, %arg0 nontemporal : f32, !ptr.ptr<#ptr.generic_space>
ptr.store %arg1, %arg0 invariant_group : f32, !ptr.ptr<#ptr.generic_space>
ptr.store %arg2, %arg0 atomic monotonic alignment = 8 : i64, !ptr.ptr<#ptr.generic_space>
ptr.store volatile %arg3, %arg0 atomic syncscope("workgroup") release nontemporal alignment = 4 : i32, !ptr.ptr<#ptr.generic_space>
return
}
```
Finally, this patch allows testing more advanced features of ptr memory
spaces, for example:
```mlir
// mlir-opt -verify-diagnostics
func.func @store_const(%arg0: !ptr.ptr<#test.const_memory_space>, %arg1: i64) {
// expected-error@+1 {{memory space is read-only}}
ptr.store %arg1, %arg0 atomic monotonic alignment = 8 : i64, !ptr.ptr<#test.const_memory_space>
return
}
```
77f256070f