The attached patch reverts revision 183011, which changed the branch
cost heuristics for Cortex-A15.
This is because further benchmarking shows that there are significant
regressions on some benchmarks which outweigh other performance gains.
OK?
Thanks,
Matt
gcc/ChangeLog:
2012-02-21 Matthew Gretton-Dann <matthew.gretton-d...@arm.com>
Revert r183011
* config/arm/arm-cores.def (cortex-a15): Use generic Cortex tuning
parameters.
* config/arm/arm.c (arm_cortex_a15_tune): Remove.
--
Matthew Gretton-Dann
Principal Engineer, PD Software, ARM Ltd.diff --git a/gcc/config/arm/arm-cores.def b/gcc/config/arm/arm-cores.def
index b0bd172..80609e0 100644
--- a/gcc/config/arm/arm-cores.def
+++ b/gcc/config/arm/arm-cores.def
@@ -129,7 +129,7 @@ ARM_CORE("cortex-a5", cortexa5, 7A,
FL_LDSCHED, cortex_a5)
ARM_CORE("cortex-a7", cortexa7, 7A,
FL_LDSCHED | FL_THUMB_DIV | FL_ARM_DIV, cortex)
ARM_CORE("cortex-a8", cortexa8, 7A,
FL_LDSCHED, cortex)
ARM_CORE("cortex-a9", cortexa9, 7A,
FL_LDSCHED, cortex_a9)
-ARM_CORE("cortex-a15", cortexa15, 7A,
FL_LDSCHED | FL_THUMB_DIV | FL_ARM_DIV, cortex_a15)
+ARM_CORE("cortex-a15", cortexa15, 7A,
FL_LDSCHED | FL_THUMB_DIV | FL_ARM_DIV, cortex)
ARM_CORE("cortex-r4", cortexr4, 7R,
FL_LDSCHED, cortex)
ARM_CORE("cortex-r4f", cortexr4f, 7R,
FL_LDSCHED, cortex)
ARM_CORE("cortex-r5", cortexr5, 7R,
FL_LDSCHED | FL_ARM_DIV, cortex)
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 4a94145..3ef3d19 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -968,17 +968,6 @@ const struct tune_params arm_cortex_a9_tune =
arm_default_branch_cost
};
-const struct tune_params arm_cortex_a15_tune =
-{
- arm_9e_rtx_costs,
- NULL,
- 1, /* Constant limit. */
- 1, /* Max cond insns. */
- ARM_PREFETCH_NOT_BENEFICIAL, /* TODO: Calculate correct
values. */
- false, /* Prefer constant pool. */
- arm_cortex_a5_branch_cost
-};
-
const struct tune_params arm_fa726te_tune =
{
arm_9e_rtx_costs,
