ARC700 targets have a store/load pipeline hazard, if we load within 2
cycles of a store, and the load/store are at the same address, then we
pay a multi-cycle penalty.
This commit avoids this by inserting nop instructions between the store
and the load.
gcc/ChangeLog:
* config/arc/arc-protos.h (arc_store_addr_hazard_p): Declare.
* config/arc/arc.c (arc_store_addr_hazard_p): New function.
(workaround_arc_anomaly): Call arc_store_addr_hazard_p for ARC700.
* config/arc/arc700.md: Add define_bypass for store/load.
gcc/testsuite/ChangeLog:
* gcc.target/arc/arc700-stld-hazard.c: New file.
From-SVN: r243007
This directory contains the GNU Compiler Collection (GCC).
The GNU Compiler Collection is free software. See the files whose
names start with COPYING for copying permission. The manuals, and
some of the runtime libraries, are under different terms; see the
individual source files for details.
The directory INSTALL contains copies of the installation information
as HTML and plain text. The source of this information is
gcc/doc/install.texi. The installation information includes details
of what is included in the GCC sources and what files GCC installs.
See the file gcc/doc/gcc.texi (together with other files that it
includes) for usage and porting information. An online readable
version of the manual is in the files gcc/doc/gcc.info*.
See http://gcc.gnu.org/bugs/ for how to report bugs usefully.
Copyright years on GCC source files may be listed using range
notation, e.g., 1987-2012, indicating that every year in the range,
inclusive, is a copyrightable year that could otherwise be listed
individually.
e9472c81d3