[PATCH][ARM] Use Cortex-A17 tuning parameters for Cortex-A12

[Kyrill Tkachov]

Hi all,

The Cortex-A12 very close to the Cortex-A17 and this patch updates the 
tuning struct
parameters to match the Cortex-A17 ones.
This has improved performance in a number of benchmarks that I tried.
The instruction scheduling is also changed to match the Cortex-A17 
scheduling

Tested arm-none-eabi.

Ok for trunk once the Cortex-A17 patch goes in?

Thanks,
Kyrill

2014-11-13  Kyrylo Tkachov  <kyrylo.tkac...@arm.com>

    * config/arm/arm.c (arm_cortex_a12_tune): Update entries to match
    Cortex-A17 tuning parameters.
    * config/arm/arm-cores.def (cortex-a12): Schedule for cortex-a17.commit 49be51d8e41840459a815f214c9b76075988b156
Author: Kyrylo Tkachov <kyrylo.tkac...@arm.com>
Date:   Tue Nov 4 09:09:48 2014 +0000

    [ARM] Use Cortex-A17 tuning settings for Cortex-A12

diff --git a/gcc/config/arm/arm-cores.def b/gcc/config/arm/arm-cores.def
index f239e61..0ef8c66 100644
--- a/gcc/config/arm/arm-cores.def
+++ b/gcc/config/arm/arm-cores.def
@@ -148,7 +148,7 @@ ARM_CORE("cortex-a5",		cortexa5, cortexa5,		7A,  FL_LDSCHED, cortex_a5)
 ARM_CORE("cortex-a7",		cortexa7, cortexa7,		7A,  FL_LDSCHED | FL_THUMB_DIV | FL_ARM_DIV, cortex_a7)
 ARM_CORE("cortex-a8",		cortexa8, cortexa8,		7A,  FL_LDSCHED, cortex_a8)
 ARM_CORE("cortex-a9",		cortexa9, cortexa9,		7A,  FL_LDSCHED, cortex_a9)
-ARM_CORE("cortex-a12",	  	cortexa12, cortexa15,		7A,  FL_LDSCHED | FL_THUMB_DIV | FL_ARM_DIV, cortex_a12)
+ARM_CORE("cortex-a12",	  	cortexa12, cortexa17,		7A,  FL_LDSCHED | FL_THUMB_DIV | FL_ARM_DIV, cortex_a12)
 ARM_CORE("cortex-a15",		cortexa15, cortexa15,		7A,  FL_LDSCHED | FL_THUMB_DIV | FL_ARM_DIV, cortex_a15)
 ARM_CORE("cortex-a17",		cortexa17, cortexa17,		7A,  FL_LDSCHED | FL_THUMB_DIV | FL_ARM_DIV, cortex_a12)
 ARM_CORE("cortex-r4",		cortexr4, cortexr4,		7R,  FL_LDSCHED, cortex)
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 6feb4b8..8d163e3 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -2014,17 +2014,17 @@ const struct tune_params arm_cortex_a12_tune =
 {
   arm_9e_rtx_costs,
   &cortexa12_extra_costs,
-  NULL,
+  NULL,						/* Sched adj cost.  */
   1,						/* Constant limit.  */
-  5,						/* Max cond insns.  */
-  ARM_PREFETCH_BENEFICIAL(4,32,32),
+  2,						/* Max cond insns.  */
+  ARM_PREFETCH_NOT_BENEFICIAL,
   false,					/* Prefer constant pool.  */
   arm_default_branch_cost,
   true,						/* Prefer LDRD/STRD.  */
   {true, true},					/* Prefer non short circuit.  */
   &arm_default_vec_cost,                        /* Vectorizer costs.  */
   false,                                        /* Prefer Neon for 64-bits bitops.  */
-  false, false,                                 /* Prefer 32-bit encodings.  */
+  true, true,                                   /* Prefer 32-bit encodings.  */
   true,						/* Prefer Neon for stringops.  */
   8,						/* Maximum insns to inline memset.  */
   ARM_FUSE_MOVW_MOVT				/* Fuseable pairs of instructions.  */