[Bug target/82533] inefficient code generation for copy loop on falkor

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82533

Andrew Pinski  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |WONTFIX

--- Comment #3 from Andrew Pinski  ---
Falkor is no longer a product so closing as won't fix.

[Bug target/82533] inefficient code generation for copy loop on falkor

[wilson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82533

--- Comment #2 from Jim Wilson  ---
Created attachment 42349
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42349=edit
proposed fix

[Bug target/82533] inefficient code generation for copy loop on falkor

[wilson at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82533

--- Comment #1 from Jim Wilson  ---
A reviewer suggested using register_offset in the address cost structure to fix
this.  That doesn't prevent all reg+reg addressing modes from being generated,
though this might be fixable with some work.  However, a bigger problem, is
that it disables reg+reg addressing modes for both loads and stores, and
disabling reg+reg loads reduces performance on Falkor.  It is only the reg+reg
quad-word store that needs to be disabled for best performance.  To make this
happen, we need to modify the md file.