Hi Alfie,
> -----Original Message-----
> From: Alfie Richards <[email protected]>
> Sent: 14 November 2025 13:45
> To: [email protected]
> Cc: Richard Earnshaw <[email protected]>; Tamar Christina
> <[email protected]>; [email protected]; Alice Carlotti
> <[email protected]>; Alex Coplan <[email protected]>; Wilco
> Dijkstra <[email protected]>; [email protected]; Alfie
> Richards <[email protected]>
> Subject: [PATCH] aarch64: Add cortex-A320 core
>
> Hi All,
>
> This adds support for the Arm Cortex-A320 core
>
> Reg-tested on AArch64.
>
> Okay for master?
>
> Alfie
>
> -- >8 --
>
> gcc/ChangeLog:
>
> * config/aarch64/aarch64-cores.def (cortex-a320): New core.
> * config/aarch64/aarch64-tune.md (tune): Add cortex-a320.
> * config/aarch64/aarch64.cc: Add cortexa320.h.
> * config/aarch64/tuning_models/cortexa320.h: New file.
> ---
> gcc/config/aarch64/aarch64-cores.def | 2 +
> gcc/config/aarch64/aarch64-tune.md | 2 +-
> gcc/config/aarch64/aarch64.cc | 1 +
> gcc/config/aarch64/tuning_models/cortexa320.h | 249
> ++++++++++++++++++
> 4 files changed, 253 insertions(+), 1 deletion(-)
> create mode 100644 gcc/config/aarch64/tuning_models/cortexa320.h
>
> diff --git a/gcc/config/aarch64/aarch64-cores.def
> b/gcc/config/aarch64/aarch64-cores.def
> index baf8abfebd7..ffb70c5e8c5 100644
> --- a/gcc/config/aarch64/aarch64-cores.def
> +++ b/gcc/config/aarch64/aarch64-cores.def
> @@ -211,6 +211,8 @@ AARCH64_CORE("cortex-a720", cortexa720,
> cortexa57, V9_2A, (SVE2_BITPERM, MEMTA
> AARCH64_CORE("cortex-a720ae", cortexa720ae, cortexa57, V9_2A,
> (SVE2_BITPERM, MEMTAG, PROFILE), neoversen2, 0x41, 0xd89, -1)
> AARCH64_CORE("cortex-a725", cortexa725, cortexa57, V9_2A,
> (SVE2_BITPERM, MEMTAG, PROFILE), neoversen3, 0x41, 0xd87, -1)
>
> +AARCH64_CORE("cortex-a320", cortexa320, cortexa57, V9_2A,
> (SVE2_BITPERM, MEMTAG), cortexa320, 0x41, 0xd8f, -1)
> +
> AARCH64_CORE("cortex-x2", cortexx2, cortexa57, V9A, (SVE2_BITPERM,
> MEMTAG, I8MM, BF16), neoversen2, 0x41, 0xd48, -1)
>
> AARCH64_CORE("cortex-x3", cortexx3, cortexa57, V9A, (SVE2_BITPERM,
> MEMTAG, I8MM, BF16), neoversev2, 0x41, 0xd4e, -1)
> diff --git a/gcc/config/aarch64/aarch64-tune.md
> b/gcc/config/aarch64/aarch64-tune.md
> index dc10f70265d..2ca4b755c7c 100644
> --- a/gcc/config/aarch64/aarch64-tune.md
> +++ b/gcc/config/aarch64/aarch64-tune.md
> @@ -1,5 +1,5 @@
> ;; -*- buffer-read-only: t -*-
> ;; Generated automatically by gentune.sh from aarch64-cores.def
> (define_attr "tune"
> -
> "cortexa34,cortexa35,cortexa53,cortexa57,cortexa72,cortexa73,thun
> derx,thunderxt88,thunderxt88p1,octeontx,octeontxt81,octeontxt83,thunder
> xt81,thunderxt83,ampere1,ampere1a,ampere1b,emag,xgene1,falkor,qdf24xx
> ,exynosm1,phecda,thunderx2t99p1,vulcan,thunderx2t99,cortexa55,cortexa7
> 5,cortexa76,cortexa76ae,cortexa77,cortexa78,cortexa78ae,cortexa78c,cortex
> a65,cortexa65ae,cortexx1,cortexx1c,neoversen1,ares,neoversee1,octeontx2,
> octeontx2t98,octeontx2t96,octeontx2t93,octeontx2f95,octeontx2f95n,octe
> ontx2f95mm,a64fx,fujitsu_monaka,tsv110,thunderx3t110,neoversev1,zeus,
> neoverse512tvb,saphira,oryon1,cortexa57cortexa53,cortexa72cortexa53,cor
> texa73cortexa35,cortexa73cortexa53,cortexa75cortexa55,cortexa76cortexa5
> 5,cortexr82,cortexr82ae,applea12,applem1_0,applem1_1,applem1_2,apple
> m1_3,applem2_0,applem2_1,applem2_2,applem2_3,applem3_0,applem3_1
> ,applem3_2,applem4_0,applem4_1,applem4_2,cortexa510,cortexa520,corte
> xa520ae,cortexa710,cortexa715,cortexa720,cortexa720ae,cortexa725,cortex
> x2,cortexx3,cortexx4,cortexx925,neoversen2,cobalt100,neoversen3,neoverse
> v2,grace,neoversev3,neoversev3ae,demeter,olympus,gb10,generic,generic_a
> rmv8_a,generic_armv9_a"
> +
> "cortexa34,cortexa35,cortexa53,cortexa57,cortexa72,cortexa73,thun
> derx,thunderxt88,thunderxt88p1,octeontx,octeontxt81,octeontxt83,thunder
> xt81,thunderxt83,ampere1,ampere1a,ampere1b,emag,xgene1,falkor,qdf24xx
> ,exynosm1,phecda,thunderx2t99p1,vulcan,thunderx2t99,cortexa55,cortexa7
> 5,cortexa76,cortexa76ae,cortexa77,cortexa78,cortexa78ae,cortexa78c,cortex
> a65,cortexa65ae,cortexx1,cortexx1c,neoversen1,ares,neoversee1,octeontx2,
> octeontx2t98,octeontx2t96,octeontx2t93,octeontx2f95,octeontx2f95n,octe
> ontx2f95mm,a64fx,fujitsu_monaka,tsv110,thunderx3t110,neoversev1,zeus,
> neoverse512tvb,saphira,oryon1,cortexa57cortexa53,cortexa72cortexa53,cor
> texa73cortexa35,cortexa73cortexa53,cortexa75cortexa55,cortexa76cortexa5
> 5,cortexr82,cortexr82ae,applea12,applem1_0,applem1_1,applem1_2,apple
> m1_3,applem2_0,applem2_1,applem2_2,applem2_3,applem3_0,applem3_1
> ,applem3_2,applem4_0,applem4_1,applem4_2,cortexa510,cortexa520,corte
> xa520ae,cortexa710,cortexa715,cortexa720,cortexa720ae,cortexa725,cortex
> a320,cortexx2,cortexx3,cortexx4,cortexx925,neoversen2,cobalt100,neoverse
> n3,neoversev2,grace,neoversev3,neoversev3ae,demeter,olympus,gb10,gene
> ric,generic_armv8_a,generic_armv9_a"
> (const (symbol_ref "((enum attr_tune) aarch64_tune)")))
> diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
> index 74e2f20de4e..1e5e5a20202 100644
> --- a/gcc/config/aarch64/aarch64.cc
> +++ b/gcc/config/aarch64/aarch64.cc
> @@ -433,6 +433,7 @@ static const struct aarch64_flag_desc
> aarch64_tuning_flags[] =
> #include "tuning_models/olympus.h"
> #include "tuning_models/a64fx.h"
> #include "tuning_models/fujitsu_monaka.h"
> +#include "tuning_models/cortexa320.h"
>
> /* Support for fine-grained override of the tuning structures. */
> struct aarch64_tuning_override_function
> diff --git a/gcc/config/aarch64/tuning_models/cortexa320.h
> b/gcc/config/aarch64/tuning_models/cortexa320.h
> new file mode 100644
> index 00000000000..f59d24bf80c
> --- /dev/null
> +++ b/gcc/config/aarch64/tuning_models/cortexa320.h
> @@ -0,0 +1,249 @@
> +/* Tuning model description for AArch64 architecture.
> + Copyright (C) 2009-2025 Free Software Foundation, Inc.
> +
> + This file is part of GCC.
> +
> + GCC is free software; you can redistribute it and/or modify it
> + under the terms of the GNU General Public License as published by
> + the Free Software Foundation; either version 3, or (at your option)
> + any later version.
> +
> + GCC is distributed in the hope that it will be useful, but
> + WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + General Public License for more details.
> +
> + You should have received a copy of the GNU General Public License
> + along with GCC; see the file COPYING3. If not see
> + <http://www.gnu.org/licenses/>. */
> +
> +#ifndef GCC_AARCH64_H_CORTEXA320
> +#define GCC_AARCH64_H_CORTEXA320
> +
> +#include "generic.h"
> +
> +static const struct cpu_addrcost_table cortexa320_addrcost_table =
> +{
> + {
> + 1, /* hi */
> + 0, /* si */
> + 0, /* di */
> + 1, /* ti */
> + },
> + 0, /* pre_modify */
> + 0, /* post_modify */
> + 2, /* post_modify_ld3_st3 */
> + 2, /* post_modify_ld4_st4 */
> + 0, /* register_offset */
> + 0, /* register_sextend */
> + 0, /* register_zextend */
> + 0 /* imm_offset */
> +};
> +
> +static const struct cpu_regmove_cost cortexa320_regmove_cost =
> +{
> + 1, /* GP2GP */
> + /* Spilling to int<->fp instead of memory is recommended so set
> + realistic costs compared to memmov_cost. */
> + 3, /* GP2FP */
> + 3, /* FP2GP */
> + 3 /* FP2FP */
> +};
> +
> +static const advsimd_vec_cost cortexa320_advsimd_vector_cost =
> +{
> + 2, /* int_stmt_cost */
This should be 3.
> + 4, /* fp_stmt_cost */
> + 1, /* ld2_st2_permute_cost */
> + 2, /* ld3_st3_permute_cost */
> + 3, /* ld4_st4_permute_cost */
> + 3, /* permute_cost */
> + 3, /* reduc_i8_cost */
> + 4, /* reduc_i16_cost */
> + 4, /* reduc_i32_cost */
> + 3, /* reduc_i64_cost */
> + 12, /* reduc_f16_cost */
> + 8, /* reduc_f32_cost */
> + 4, /* reduc_f64_cost */
> + 0, /* store_elt_extra_cost */
> + /* This value is just inherited from the Cortex-A57 table. */
> + 8, /* vec_to_scalar_cost */
> + /* This depends very much on what the scalar value is and
> + where it comes from. E.g. some constants take two dependent
> + instructions or a load, while others might be moved from a GPR.
> + 4 seems to be a reasonable compromise in practice. */
> + 4, /* scalar_to_vec_cost */
> + 3, /* align_load_cost */
> + 3, /* unalign_load_cost */
> + /* Although stores have a latency of 2 and compete for the
> + vector pipes, in practice it's better not to model that. */
> + 1, /* unalign_store_cost */
> + 1 /* store_cost */
> +};
> +
> +static const sve_vec_cost cortexa320_sve_vector_cost =
> +{
> + {
> + 3, /* int_stmt_cost */
> + 4, /* fp_stmt_cost */
> + 0, /* ld2_st2_permute_cost */
> + 2, /* ld3_st3_permute_cost */
> + 2, /* ld4_st4_permute_cost */
> + 3, /* permute_cost */
> + /* Theoretically, a reduction involving 15 scalar ADDs could
> + complete in ~15 cycles and would have a cost of 15. [SU]ADDV
> + completes in 4 cycles, so give it a cost of 15 + -11. */
> + 4, /* reduc_i8_cost */
> + /* Likewise for 7 scalar ADDs (~7 cycles) vs. 4: 7 + -3. */
> + 4, /* reduc_i16_cost */
> + /* Likewise for 3 scalar ADDs (~3 cycles) vs. 4: 3 + 1. */
> + 4, /* reduc_i32_cost */
> + /* Likewise for 1 scalar ADD (~1 cycles) vs. 4: 1 + 3. */
> + 4, /* reduc_i64_cost */
> + /* Theoretically, a reduction involving 7 scalar FADDs could
> + complete in ~28 cycles and would have a cost of 28. FADDV
> + completes in 12 cycles, so give it a cost of 28 + -16. */
> + 12, /* reduc_f16_cost */
> + /* Likewise for 3 scalar FADDs (~12 cycles) vs. 8: 12 + -4. */
> + 8, /* reduc_f32_cost */
> + /* Likewise for 1 scalar FADD (~4 cycles) vs. 4: 4 + 0. */
> + 4, /* reduc_f64_cost */
> + -1, /* store_elt_extra_cost */
> + /* This value is just inherited from the Cortex-A57 table. */
> + 8, /* vec_to_scalar_cost */
> + /* See the comment above the Advanced SIMD versions. */
> + 4, /* scalar_to_vec_cost */
> + 4, /* align_load_cost */
> + 4, /* unalign_load_cost */
> + /* Although stores have a latency of 2 and compete for the
> + vector pipes, in practice it's better not to model that. */
> + 1, /* unalign_store_cost */
> + 1 /* store_cost */
> + },
> + 4, /* clast_cost */
> + 25, /* fadda_f16_cost */
> + 9, /* fadda_f32_cost */
> + 3, /* fadda_f64_cost */
> + /* A strided Advanced SIMD x64 load would take two parallel FP loads
> + (6 cycles) plus an insertion (3 cycles). Assume a 64-bit SVE gather
> + is 1 cycle more. The Advanced SIMD version is costed as 2 scalar loads
> + (cost 6) and a vec_construct (cost 6). Add a full vector operation
> + (cost 2) to that, to avoid the difference being lost in rounding.
> +
> + There is no easy comparison between a strided Advanced SIMD x32 load
> + and an SVE 32-bit gather, but cost an SVE 32-bit gather as 1 vector
> + operation more than a 64-bit gather. */
> + 14, /* gather_load_x32_cost */
> + 11, /* gather_load_x64_cost */
> + 42, /* gather_load_x32_init_cost */
> + 22, /* gather_load_x64_init_cost */
> + 0 /* scatter_store_elt_cost */
> +};
> +
> +static const aarch64_scalar_vec_issue_info cortexa320_scalar_issue_info =
> +{
> + 1, /* loads_stores_per_cycle */
> + 1, /* stores_per_cycle */
> + 1, /* general_ops_per_cycle */
> + 1, /* fp_simd_load_general_ops */
> + 1 /* fp_simd_store_general_ops */
> +};
> +
> +static const aarch64_advsimd_vec_issue_info
> cortexa320_advsimd_issue_info =
> +{
> + {
> + 1, /* loads_stores_per_cycle */
> + 1, /* stores_per_cycle */
> + 1, /* general_ops_per_cycle */
> + 1, /* fp_simd_load_general_ops */
> + 1 /* fp_simd_store_general_ops */
> + },
> + 1, /* ld2_st2_general_ops */
> + 1, /* ld3_st3_general_ops */
> + 1 /* ld4_st4_general_ops */
> +};
> +
> +static const aarch64_sve_vec_issue_info cortexa320_sve_issue_info =
> +{
> + {
> + {
> + 1, /* loads_stores_per_cycle */
> + 1, /* stores_per_cycle */
> + 1, /* general_ops_per_cycle */
> + 1, /* fp_simd_load_general_ops */
> + 1 /* fp_simd_store_general_ops */
> + },
> + 1, /* ld2_st2_general_ops */
> + 1, /* ld3_st3_general_ops */
> + 1 /* ld4_st4_general_ops */
> + },
> + 1, /* pred_ops_per_cycle */
> + 1, /* while_pred_ops */
> + 1, /* int_cmp_pred_ops */
> + 1, /* fp_cmp_pred_ops */
> + 1, /* gather_scatter_pair_general_ops */
> + 1 /* gather_scatter_pair_pred_ops */
> +};
> +
> +static const aarch64_vec_issue_info cortexa320_vec_issue_info =
> +{
> + &cortexa320_scalar_issue_info,
> + &cortexa320_advsimd_issue_info,
> + &cortexa320_sve_issue_info
> +};
> +
> +/* Cortexa320 costs for vector insn classes. */
> +static const struct cpu_vector_cost cortexa320_vector_cost =
> +{
> + 1, /* scalar_int_stmt_cost */
> + 2, /* scalar_fp_stmt_cost */
> + 4, /* scalar_load_cost */
> + 1, /* scalar_store_cost */
> + 1, /* cond_taken_branch_cost */
> + 1, /* cond_not_taken_branch_cost */
> + &cortexa320_advsimd_vector_cost, /* advsimd */
> + &cortexa320_sve_vector_cost, /* sve */
> + &cortexa320_vec_issue_info /* issue_info */
> +};
> +
> +static const struct tune_params cortexa320_tunings =
> +{
> + &cortexa76_extra_costs,
> + &cortexa320_addrcost_table,
> + &cortexa320_regmove_cost,
> + &cortexa320_vector_cost,
> + &generic_branch_cost,
> + &generic_approx_modes,
> + SVE_128, /* sve_width */
> + { 1, /* load_int. */
> + 1, /* store_int. */
> + 1, /* load_fp. */
> + 1, /* store_fp. */
> + 1, /* load_pred. */
> + 1 /* store_pred. */
> + }, /* memmov_cost. */
> + 1, /* issue_rate */
> + (AARCH64_FUSE_AES_AESMC | AARCH64_FUSE_CMP_BRANCH), /*
Lets use AARCH64_FUSE_NEOVERSE_BASE, the additional fusions won't
hurt the core but makes it easier to maintain
> fusible_ops */
> + "32:16", /* function_align. */
> + "4", /* jump_align. */
> + "32:16", /* loop_align. */
> + 1, /* int_reassoc_width. */
> + 1, /* fp_reassoc_width. */
> + 1, /* fma_reassoc_width. */
> + 1, /* vec_reassoc_width. */
> + 2, /* min_div_recip_mul_sf. */
> + 2, /* min_div_recip_mul_df. */
> + 0, /* max_case_values. */
> + tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> + (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND
> + | AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
> + | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
> + | AARCH64_EXTRA_TUNE_AVOID_PRED_RMW), /* tune_flags. */
This core doesn't need this.
Some things here (not through any fault of your own) don't look
quite right, so lets follow up internally.
Thanks,
Tamar
> + &generic_armv9a_prefetch_tune,
> + AARCH64_LDP_STP_POLICY_ALWAYS, /* ldp_policy_model. */
> + AARCH64_LDP_STP_POLICY_ALWAYS, /* stp_policy_model. */
> + nullptr /* dispatch_constraints. */
> +
> +};
> +
> +#endif /* GCC_AARCH64_H_CORTEXA320. */
> --
> 2.34.1
