diff options
| author | Andrew Burgess <aburgess@gcc.gnu.org> | 2016-11-30 11:08:06 +0000 |
|---|---|---|
| committer | Andrew Burgess <aburgess@gcc.gnu.org> | 2016-11-30 11:08:06 +0000 |
| commit | e9472c81d3efe5996e501348cc218c2ab79f3f38 (patch) | |
| tree | 20dcea3cae10d8f23d4bd700e09dc2746d4bb193 /gcc/config/arc/arc-protos.h | |
| parent | a7da4881303a7bc9a59014f0d03cd946a9cdecec (diff) | |
| download | gcc-e9472c81d3efe5996e501348cc218c2ab79f3f38.zip gcc-e9472c81d3efe5996e501348cc218c2ab79f3f38.tar.gz gcc-e9472c81d3efe5996e501348cc218c2ab79f3f38.tar.bz2 | |
arc: Avoid store/load pipeline hazard
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
Diffstat (limited to 'gcc/config/arc/arc-protos.h')
| -rw-r--r-- | gcc/config/arc/arc-protos.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/gcc/config/arc/arc-protos.h b/gcc/config/arc/arc-protos.h index d1266b4..83a0b73 100644 --- a/gcc/config/arc/arc-protos.h +++ b/gcc/config/arc/arc-protos.h @@ -123,3 +123,4 @@ extern bool arc_legitimize_reload_address (rtx *, machine_mode, int, int); extern void arc_secondary_reload_conv (rtx, rtx, rtx, bool); extern bool insn_is_tls_gd_dispatch (rtx_insn *); extern void arc_cpu_cpp_builtins (cpp_reader *); +extern bool arc_store_addr_hazard_p (rtx_insn *, rtx_insn *); |