Hi,
While writing a scheduler for Cavium's aarch64 processor (Thunder),
I found there was no way currently to change the issue rate in
back-end. This patch adds a field (issue_rate) to tune_params and
creates a new function that the middle-end calls. I updated the
current two tuning variables (generic_tunings and cortexa53_tunings)
to be 1 which was the default before.
OK? Built and tested for aarch64-elf with no regressions.
Thanks,
Andrew Pinski
ChangeLog:
* config/aarch64/aarch64-protos.h (tune_params): Add issue_rate.
* config/aarch64/aarch64.c (generic_tunings): Add issue rate of 1.
(cortexa53_tunings): Likewise.
(aarch64_sched_issue_rate): New function.
(TARGET_SCHED_ISSUE_RATE): Define.
Index: config/aarch64/aarch64-protos.h
===================================================================
--- config/aarch64/aarch64-protos.h (revision 206594)
+++ config/aarch64/aarch64-protos.h (working copy)
@@ -156,6 +156,7 @@ struct tune_params
const struct cpu_regmove_cost *const regmove_cost;
const struct cpu_vector_cost *const vec_costs;
const int memmov_cost;
+ const int issue_rate;
};
HOST_WIDE_INT aarch64_initial_elimination_offset (unsigned, unsigned);
Index: config/aarch64/aarch64.c
===================================================================
--- config/aarch64/aarch64.c (revision 206594)
+++ config/aarch64/aarch64.c (working copy)
@@ -221,7 +221,8 @@ static const struct tune_params generic_
&generic_addrcost_table,
&generic_regmove_cost,
&generic_vector_cost,
- NAMED_PARAM (memmov_cost, 4)
+ NAMED_PARAM (memmov_cost, 4),
+ NAMED_PARAM (issue_rate, 1)
};
static const struct tune_params cortexa53_tunings =
@@ -230,7 +231,8 @@ static const struct tune_params cortexa5
&generic_addrcost_table,
&generic_regmove_cost,
&generic_vector_cost,
- NAMED_PARAM (memmov_cost, 4)
+ NAMED_PARAM (memmov_cost, 4),
+ NAMED_PARAM (issue_rate, 1)
};
/* A processor implementing AArch64. */
@@ -4895,6 +4897,13 @@ aarch64_memory_move_cost (enum machine_m
return aarch64_tune_params->memmov_cost;
}
+/* Return the number of instructions that can be issued per cycle. */
+static int
+aarch64_sched_issue_rate (void)
+{
+ return aarch64_tune_params->issue_rate;
+}
+
/* Vectorizer cost model target hooks. */
/* Implement targetm.vectorize.builtin_vectorization_cost. */
@@ -8411,6 +8420,9 @@ aarch64_vectorize_vec_perm_const_ok (enu
#undef TARGET_RTX_COSTS
#define TARGET_RTX_COSTS aarch64_rtx_costs
+#undef TARGET_SCHED_ISSUE_RATE
+#define TARGET_SCHED_ISSUE_RATE aarch64_sched_issue_rate
+
#undef TARGET_TRAMPOLINE_INIT
#define TARGET_TRAMPOLINE_INIT aarch64_trampoline_init
