[Bug rtl-optimization/60969] [4.9/4.10 Regression] ICE in output_129 in MMXMOV of mode MODE_SF for march=pentium4

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60969

--- Comment #21 from H.J. Lu <hjl.tools at gmail dot com> ---
MMX and x87 registers are aliases of each others. They can't be used
at the same time.  Is there a way to pass this information to RA?