Inefficient codegen with struct consisting of 2 SIMD vectors. #83749
Description
Description
CoreCLR emits inefficient codegen when working with structs consisting of 2 SIMD vectors, for example custom structs with 2xVector128 or Vector512 on platforms without AVX512.
If you compare the codegen for methods A and B in the reproduction, you can notice the JIT spilling the custom structs instead of promoting them in B. The goal here would be to have B emit the same codegen as A does.
If you look at Memmove there, you'll notice that the JIT does not spill them, but introduces a lot of redundant adds and leas in the codegen.
Configuration
Windows x64 .Net 8 preview 2
Regression?
Probably not, checked just stack spilling and it occurs on .Net 7