[Bug rtl-optimization/31485] C complex numbers, amd64 SSE, missed optimization opportunity

[bisqwit at iki dot fi]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31485

--- Comment #13 from Joel Yliluoma <bisqwit at iki dot fi> ---
GCC 4.1.2 is indicated in the bug report headers.
Luckily, Compiler Explorer has a copy of that exact version, and it indeed
vectorizes the second function: https://godbolt.org/z/DC_SSb

On my own system, the earliest I have is 4.6. The Compiler Explorer has 4.4,
and it, or anything newer than that, no longer vectorizes either function.