[PATCH/VECT/AARCH64] Improve cost model for ThunderX2 CN99xx
Andrew Pinski
apinski@cavium.com
Tue Jan 31 22:41:00 GMT 2017
On Sat, Jan 28, 2017 at 12:34 PM, Andrew Pinski <apinski@cavium.com> wrote:
> Hi,
> On some (most) AARCH64 cores, it is not always profitable to
> vectorize some integer loops. This patch does two things (I can split
> it into different patches if needed).
> 1) It splits the aarch64 back-end's vector cost model's vector and
> scalar costs into int and fp fields
> 1a) For thunderx2t99, models correctly the integer vector/scalar costs.
> 2) Fixes/Improves a few calls to record_stmt_cost in tree-vect-loop.c
> where stmt_info was not being passed.
>
> OK? Bootstrapped and tested on aarch64-linux-gnu and provides 20% on
> libquantum and ~1% overall on SPEC CPU 2006 int.
Here is the updated patch with the fixes requested by both Richards.
Still the same performance as above.
OK?
Thanks,
Andrew
ChangLog:
* tree-vect-loop.c (vect_compute_single_scalar_iteration_cost): Pass
stmt_info to record_stmt_cost.
(vect_get_known_peeling_cost): Pass stmt_info if known to record_stmt_cost.
* config/aarch64/aarch64-protos.h (cpu_vector_cost): Split
cpu_vector_cost field into
scalar_int_stmt_cost and scalar_fp_stmt_cost. Split vec_stmt_cost
field into vec_int_stmt_cost and vec_fp_stmt_cost.
* config/aarch64/aarch64.c (generic_vector_cost): Update for the
splitting of scalar_stmt_cost and vec_stmt_cost.
(thunderx_vector_cost): Likewise.
(cortexa57_vector_cost): LIkewise.
(exynosm1_vector_cost): Likewise.
(xgene1_vector_cost): Likewise.
(thunderx2t99_vector_cost): Improve after the splitting of the two fields.
(aarch64_builtin_vectorization_cost): Update for the splitting of
scalar_stmt_cost and vec_stmt_cost.
>
> Thanks,
> Andrew Pinski
>
> ChangeLog:
> * tree-vect-loop.c (vect_compute_single_scalar_iteration_cost): Pass
> stmt_info to record_stmt_cost.
> (vect_get_known_peeling_cost): Pass stmt_info if known to record_stmt_cost.
>
> * config/aarch64/aarch64-protos.h (cpu_vector_cost): Split
> cpu_vector_cost field into
> scalar_int_stmt_cost and scalar_fp_stmt_cost. Split vec_stmt_cost
> field into vec_int_stmt_cost and vec_fp_stmt_cost.
> * config/aarch64/aarch64.c (generic_vector_cost): Update for the
> splitting of scalar_stmt_cost and vec_stmt_cost.
> (thunderx_vector_cost): Likewise.
> (cortexa57_vector_cost): LIkewise.
> (exynosm1_vector_cost): Likewise.
> (xgene1_vector_cost): Likewise.
> (thunderx2t99_vector_cost): Improve after the splitting of the two fields.
> (aarch64_builtin_vectorization_cost): Update for the splitting of
> scalar_stmt_cost and vec_stmt_cost.
-------------- next part --------------
Index: config/aarch64/aarch64-protos.h
===================================================================
--- config/aarch64/aarch64-protos.h (revision 245070)
+++ config/aarch64/aarch64-protos.h (working copy)
@@ -151,11 +151,17 @@ struct cpu_regmove_cost
/* Cost for vector insn classes. */
struct cpu_vector_cost
{
- const int scalar_stmt_cost; /* Cost of any scalar operation,
+ const int scalar_int_stmt_cost; /* Cost of any int scalar operation,
+ excluding load and store. */
+ const int scalar_fp_stmt_cost; /* Cost of any fp scalar operation,
excluding load and store. */
const int scalar_load_cost; /* Cost of scalar load. */
const int scalar_store_cost; /* Cost of scalar store. */
- const int vec_stmt_cost; /* Cost of any vector operation,
+ const int vec_int_stmt_cost; /* Cost of any int vector operation,
+ excluding load, store, permute,
+ vector-to-scalar and
+ scalar-to-vector operation. */
+ const int vec_fp_stmt_cost; /* Cost of any fp vector operation,
excluding load, store, permute,
vector-to-scalar and
scalar-to-vector operation. */
Index: config/aarch64/aarch64.c
===================================================================
--- config/aarch64/aarch64.c (revision 245070)
+++ config/aarch64/aarch64.c (working copy)
@@ -365,10 +365,12 @@ static const struct cpu_regmove_cost thu
/* Generic costs for vector insn classes. */
static const struct cpu_vector_cost generic_vector_cost =
{
- 1, /* scalar_stmt_cost */
+ 1, /* scalar_int_stmt_cost */
+ 1, /* scalar_fp_stmt_cost */
1, /* scalar_load_cost */
1, /* scalar_store_cost */
- 1, /* vec_stmt_cost */
+ 1, /* vec_int_stmt_cost */
+ 1, /* vec_fp_stmt_cost */
2, /* vec_permute_cost */
1, /* vec_to_scalar_cost */
1, /* scalar_to_vec_cost */
@@ -383,10 +385,12 @@ static const struct cpu_vector_cost gene
/* ThunderX costs for vector insn classes. */
static const struct cpu_vector_cost thunderx_vector_cost =
{
- 1, /* scalar_stmt_cost */
+ 1, /* scalar_int_stmt_cost */
+ 1, /* scalar_fp_stmt_cost */
3, /* scalar_load_cost */
1, /* scalar_store_cost */
- 4, /* vec_stmt_cost */
+ 4, /* vec_int_stmt_cost */
+ 4, /* vec_fp_stmt_cost */
4, /* vec_permute_cost */
2, /* vec_to_scalar_cost */
2, /* scalar_to_vec_cost */
@@ -401,10 +405,12 @@ static const struct cpu_vector_cost thun
/* Generic costs for vector insn classes. */
static const struct cpu_vector_cost cortexa57_vector_cost =
{
- 1, /* scalar_stmt_cost */
+ 1, /* scalar_int_stmt_cost */
+ 1, /* scalar_fp_stmt_cost */
4, /* scalar_load_cost */
1, /* scalar_store_cost */
- 2, /* vec_stmt_cost */
+ 2, /* vec_int_stmt_cost */
+ 2, /* vec_fp_stmt_cost */
3, /* vec_permute_cost */
8, /* vec_to_scalar_cost */
8, /* scalar_to_vec_cost */
@@ -418,10 +424,12 @@ static const struct cpu_vector_cost cort
static const struct cpu_vector_cost exynosm1_vector_cost =
{
- 1, /* scalar_stmt_cost */
+ 1, /* scalar_int_stmt_cost */
+ 1, /* scalar_fp_stmt_cost */
5, /* scalar_load_cost */
1, /* scalar_store_cost */
- 3, /* vec_stmt_cost */
+ 3, /* vec_int_stmt_cost */
+ 3, /* vec_fp_stmt_cost */
3, /* vec_permute_cost */
3, /* vec_to_scalar_cost */
3, /* scalar_to_vec_cost */
@@ -436,10 +444,12 @@ static const struct cpu_vector_cost exyn
/* Generic costs for vector insn classes. */
static const struct cpu_vector_cost xgene1_vector_cost =
{
- 1, /* scalar_stmt_cost */
+ 1, /* scalar_int_stmt_cost */
+ 1, /* scalar_fp_stmt_cost */
5, /* scalar_load_cost */
1, /* scalar_store_cost */
- 2, /* vec_stmt_cost */
+ 2, /* vec_int_stmt_cost */
+ 2, /* vec_fp_stmt_cost */
2, /* vec_permute_cost */
4, /* vec_to_scalar_cost */
4, /* scalar_to_vec_cost */
@@ -454,10 +464,12 @@ static const struct cpu_vector_cost xgen
/* Costs for vector insn classes for Vulcan. */
static const struct cpu_vector_cost thunderx2t99_vector_cost =
{
- 6, /* scalar_stmt_cost */
+ 1, /* scalar_int_stmt_cost */
+ 6, /* scalar_fp_stmt_cost */
4, /* scalar_load_cost */
1, /* scalar_store_cost */
- 6, /* vec_stmt_cost */
+ 5, /* vec_int_stmt_cost */
+ 6, /* vec_fp_stmt_cost */
3, /* vec_permute_cost */
6, /* vec_to_scalar_cost */
5, /* scalar_to_vec_cost */
@@ -8119,50 +8131,55 @@ aarch64_builtin_vectorization_cost (enum
int misalign ATTRIBUTE_UNUSED)
{
unsigned elements;
+ const cpu_vector_cost *costs = aarch64_tune_params.vec_costs;
+ bool fp = false;
+
+ if (vectype != NULL)
+ fp = FLOAT_TYPE_P (vectype);
switch (type_of_cost)
{
case scalar_stmt:
- return aarch64_tune_params.vec_costs->scalar_stmt_cost;
+ return fp ? costs->scalar_fp_stmt_cost : costs->scalar_int_stmt_cost;
case scalar_load:
- return aarch64_tune_params.vec_costs->scalar_load_cost;
+ return costs->scalar_load_cost;
case scalar_store:
- return aarch64_tune_params.vec_costs->scalar_store_cost;
+ return costs->scalar_store_cost;
case vector_stmt:
- return aarch64_tune_params.vec_costs->vec_stmt_cost;
+ return fp ? costs->vec_fp_stmt_cost : costs->vec_int_stmt_cost;
case vector_load:
- return aarch64_tune_params.vec_costs->vec_align_load_cost;
+ return costs->vec_align_load_cost;
case vector_store:
- return aarch64_tune_params.vec_costs->vec_store_cost;
+ return costs->vec_store_cost;
case vec_to_scalar:
- return aarch64_tune_params.vec_costs->vec_to_scalar_cost;
+ return costs->vec_to_scalar_cost;
case scalar_to_vec:
- return aarch64_tune_params.vec_costs->scalar_to_vec_cost;
+ return costs->scalar_to_vec_cost;
case unaligned_load:
- return aarch64_tune_params.vec_costs->vec_unalign_load_cost;
+ return costs->vec_unalign_load_cost;
case unaligned_store:
- return aarch64_tune_params.vec_costs->vec_unalign_store_cost;
+ return costs->vec_unalign_store_cost;
case cond_branch_taken:
- return aarch64_tune_params.vec_costs->cond_taken_branch_cost;
+ return costs->cond_taken_branch_cost;
case cond_branch_not_taken:
- return aarch64_tune_params.vec_costs->cond_not_taken_branch_cost;
+ return costs->cond_not_taken_branch_cost;
case vec_perm:
- return aarch64_tune_params.vec_costs->vec_permute_cost;
+ return costs->vec_permute_cost;
case vec_promote_demote:
- return aarch64_tune_params.vec_costs->vec_stmt_cost;
+ return fp ? costs->vec_fp_stmt_cost : costs->vec_int_stmt_cost;
case vec_construct:
elements = TYPE_VECTOR_SUBPARTS (vectype);
Index: tree-vect-loop.c
===================================================================
--- tree-vect-loop.c (revision 245070)
+++ tree-vect-loop.c (working copy)
@@ -1329,9 +1329,9 @@ vect_compute_single_scalar_iteration_cos
continue;
vect_cost_for_stmt kind;
- if (STMT_VINFO_DATA_REF (vinfo_for_stmt (stmt)))
+ if (STMT_VINFO_DATA_REF (stmt_info))
{
- if (DR_IS_READ (STMT_VINFO_DATA_REF (vinfo_for_stmt (stmt))))
+ if (DR_IS_READ (STMT_VINFO_DATA_REF (stmt_info)))
kind = scalar_load;
else
kind = scalar_store;
@@ -1341,7 +1341,7 @@ vect_compute_single_scalar_iteration_cos
scalar_single_iter_cost
+= record_stmt_cost (&LOOP_VINFO_SCALAR_ITERATION_COST (loop_vinfo),
- factor, kind, NULL, 0, vect_prologue);
+ factor, kind, stmt_info, 0, vect_prologue);
}
}
LOOP_VINFO_SINGLE_SCALAR_ITERATION_COST (loop_vinfo)
@@ -3178,16 +3178,24 @@ vect_get_known_peeling_cost (loop_vec_in
int j;
if (peel_iters_prologue)
FOR_EACH_VEC_ELT (*scalar_cost_vec, j, si)
- retval += record_stmt_cost (prologue_cost_vec,
- si->count * peel_iters_prologue,
- si->kind, NULL, si->misalign,
- vect_prologue);
+ {
+ stmt_vec_info stmt_info
+ = si->stmt ? vinfo_for_stmt (si->stmt) : NULL;
+ retval += record_stmt_cost (prologue_cost_vec,
+ si->count * peel_iters_prologue,
+ si->kind, stmt_info, si->misalign,
+ vect_prologue);
+ }
if (*peel_iters_epilogue)
FOR_EACH_VEC_ELT (*scalar_cost_vec, j, si)
- retval += record_stmt_cost (epilogue_cost_vec,
- si->count * *peel_iters_epilogue,
- si->kind, NULL, si->misalign,
- vect_epilogue);
+ {
+ stmt_vec_info stmt_info
+ = si->stmt ? vinfo_for_stmt (si->stmt) : NULL;
+ retval += record_stmt_cost (epilogue_cost_vec,
+ si->count * *peel_iters_epilogue,
+ si->kind, stmt_info, si->misalign,
+ vect_epilogue);
+ }
return retval;
}
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