The original submission of AmpereOne (-mcpu=ampere1) costs occurred
prior to exhaustive testing of vectorizable workloads against
hardware.
Adjust the vector costs to achieve the best results and more closely
match the underlying hardware.
gcc/ChangeLog:
* config/aarch64/aarch64.cc: Update vector costs for ampere1.
Co-Authored-By: Manolis Tsamis <manolis.tsa...@vrull.eu>
Signed-off-by: Philipp Tomsich <philipp.toms...@vrull.eu>
---
We would like to get this into GCC 13 to avoid having to backport at
the start of the next cycle.
OK for backports?
gcc/config/aarch64/aarch64.cc | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index b27f4354031..661fff65cea 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -1132,7 +1132,7 @@ static const struct cpu_vector_cost
thunderx3t110_vector_cost =
static const advsimd_vec_cost ampere1_advsimd_vector_cost =
{
- 3, /* int_stmt_cost */
+ 1, /* int_stmt_cost */
3, /* fp_stmt_cost */
0, /* ld2_st2_permute_cost */
0, /* ld3_st3_permute_cost */
@@ -1148,17 +1148,17 @@ static const advsimd_vec_cost
ampere1_advsimd_vector_cost =
8, /* store_elt_extra_cost */
6, /* vec_to_scalar_cost */
7, /* scalar_to_vec_cost */
- 5, /* align_load_cost */
- 5, /* unalign_load_cost */
- 2, /* unalign_store_cost */
- 2 /* store_cost */
+ 4, /* align_load_cost */
+ 4, /* unalign_load_cost */
+ 1, /* unalign_store_cost */
+ 1 /* store_cost */
};
/* Ampere-1 costs for vector insn classes. */
static const struct cpu_vector_cost ampere1_vector_cost =
{
1, /* scalar_int_stmt_cost */
- 1, /* scalar_fp_stmt_cost */
+ 3, /* scalar_fp_stmt_cost */
4, /* scalar_load_cost */
1, /* scalar_store_cost */
1, /* cond_taken_branch_cost */
--
2.34.1
