[Bug target/48701] [missed optimization] GCC fails to use aliasing of ymm and xmm registers

[kretz at kde dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48701

--- Comment #3 from Matthias Kretz <kretz at kde dot org> ---
Updated test case at https://godbolt.org/g/D5P1N1.
`testLoad` was fixed with 4.7.
`testStore` still combines via the stack.