[Bug target/70465] [4.9/5/6/7 Regression] Poor code for x87 asm

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70465

--- Comment #8 from Jeffrey A. Law <law at redhat dot com> ---
I understand the issues around heuristics.

Presumably this is the code which identifies cases where we have a single use
register with an associated REG_EQUIV note and we move the insn that sets the
equivalence to the point just before the use?  Which has the side effect of
giving is a "bad" ordering in this case (and just as likely may give us a
"good" ordering in other cases).