tests: benchdnn: print csv friendly perf header

tests/benchdnn/bnorm/bnorm.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2017 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -234,6 +235,10 @@ struct perf_report_t : public base_perf_report_t {
           << p_->iw << ',' << p_->eps;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "mb,ic,id,ih,iw,eps";
+    }
+
     void dump_flags(std::ostream &s) const override {
         s << flags2str(p_->flags);
     }

tests/benchdnn/conv/conv.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2017 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -230,6 +231,10 @@ struct perf_report_t : public base_perf_report_t {
           << p_->dd << ',' << p_->dh << ',' << p_->dw;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "g,mb,ic,id,ih,iw,oc,od,oh,ow,kd,kh,kw,sd,sh,sw,pd,ph,pw,dd,dh,dw";
+    }
+
     double ops() const override { return p_->ops; }
     const std::vector<dnnl_data_type_t> *sdt() const override {
         return &p_->dt;

tests/benchdnn/deconv/deconv.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2022 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -228,6 +229,10 @@ struct perf_report_t : public base_perf_report_t {
           << p_->dd << ',' << p_->dh << ',' << p_->dw;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "g,mb,ic,id,ih,iw,oc,od,oh,ow,kd,kh,kw,sd,sh,sw,pd,ph,pw,dd,dh,dw";
+    }
+
     double ops() const override { return p_->ops; }
     const std::vector<dnnl_data_type_t> *sdt() const override {
         return &p_->dt;

tests/benchdnn/gnorm/gnorm.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2023 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -225,6 +226,10 @@ struct perf_report_t : public base_perf_report_t {
           << p_->ih << ',' << p_->iw << ',' << p_->eps;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "g,mb,ic,id,ih,iw,eps";
+    }
+
     void dump_flags(std::ostream &s) const override {
         s << flags2str(p_->flags);
     }

tests/benchdnn/ip/ip.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2017 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -164,6 +165,10 @@ struct perf_report_t : public base_perf_report_t {
           << p_->ih << ',' << p_->iw;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "mb,oc,ic,id,ih,iw";
+    }
+
     double ops() const override { return p_->ops; }
     const std::vector<dnnl_data_type_t> *sdt() const override {
         return &p_->dt;

tests/benchdnn/lrn/lrn.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2017 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -140,6 +141,10 @@ struct perf_report_t : public base_perf_report_t {
           << ',' << p_->k;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "mb,ic,id,ih,iw,ls,alpha,beta,k";
+    }
+
     const int64_t *user_mb() const override { return &p_->user_mb; }
     const attr_t *attr() const override { return &p_->attr; }
     const thr_ctx_t *ctx_init() const override { return &p_->ctx_init; }

tests/benchdnn/matmul/matmul.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2019 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -234,6 +235,8 @@ struct perf_report_t : public base_perf_report_t {
 
     void dump_desc_csv(std::ostream &s) const override { dump_desc(s); }
 
+    void dump_desc_csv_header(std::ostream &s) const override { s << "desc"; }
+
     double ops() const override { return p_->ops; }
     const std::vector<dnnl_data_type_t> *sdt() const override {
         return &p_->dt;

tests/benchdnn/pool/pool.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2019 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -207,6 +208,10 @@ struct perf_report_t : public base_perf_report_t {
           << p_->dd << ',' << p_->dh << ',' << p_->dw;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "mb,ic,id,ih,iw,od,oh,ow,kd,kh,kw,sd,sh,sw,pd,ph,pw,dd,dh,dw";
+    }
+
     const int64_t *user_mb() const override { return &p_->user_mb; }
     const std::vector<dnnl_data_type_t> *sdt() const override {
         return &p_->dt;

tests/benchdnn/resampling/resampling.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2019 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -155,6 +156,10 @@ struct perf_report_t : public base_perf_report_t {
           << p_->od << ',' << p_->oh << ',' << p_->ow;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "mb,ic,id,ih,iw,od,oh,ow";
+    }
+
     const int64_t *user_mb() const override { return &p_->user_mb; }
     const attr_t *attr() const override { return &p_->attr; }
     const thr_ctx_t *ctx_init() const override { return &p_->ctx_init; }

tests/benchdnn/rnn/rnn.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2018 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -578,6 +579,10 @@ struct perf_report_t : public base_perf_report_t {
           << "," << p_->slc << "," << p_->dhc << "," << p_->dic;
     }
 
+    void dump_desc_csv_header(std::ostream &s) const override {
+        s << "n_layer,n_iter,mb,sic,slc,dhc,dic";
+    }
+
     void dump_rnn_activation(std::ostream &s) const override {
         s << activation2str(p_->activation);
     }

tests/benchdnn/utils/perf_report.cpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2021 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -21,6 +22,7 @@
 
 void base_perf_report_t::report(res_t *res, const char *prb_str) const {
     dump_perf_footer();
+    dump_perf_csv_header();
 
     dnnl::impl::stringstream_t ss;
 
@@ -156,3 +158,53 @@ void base_perf_report_t::handle_option(std::ostream &s, const char *&option,
             opt_name.c_str());
     SAFE_V(FAIL);
 }
+
+void base_perf_report_t::dump_perf_csv_header() const {
+    if (strstr(pt_, "%DESC%") == nullptr) return;
+
+    static bool header_printed = false;
+    if (header_printed) return;
+
+    const char *pt = pt_;
+    char c;
+    dnnl::impl::stringstream_t ss;
+    while ((c = *pt++) != '\0') {
+        if (c != '%') {
+            ss << c;
+            continue;
+        }
+        handle_csv_header_option(ss, pt);
+    }
+
+    BENCHDNN_PRINT(0, "%s\n", ss.str().c_str());
+    header_printed = true;
+}
+
+void base_perf_report_t::handle_csv_header_option(
+        std::ostream &s, const char *&option) const {
+    char c = *option;
+    if (c == '-' || c == '0' || c == '+') {
+        switch (c) {
+            case '-': s << "min_"; break;
+            case '0': s << "avg_"; break;
+            case '+': s << "max_"; break;
+            default: break;
+        }
+        ++option;
+    }
+
+    const char *option_end = strchr(option, '%');
+    if (!option_end) {
+        option += strlen(option);
+        return;
+    }
+
+    const std::string opt_name(option, option_end);
+    if (opt_name == "DESC") {
+        dump_desc_csv_header(s);
+    } else {
+        s << opt_name;
+    }
+
+    option = option_end + 1;
+}

tests/benchdnn/utils/perf_report.hpp

@@ -1,5 +1,6 @@
 /*******************************************************************************
 * Copyright 2019 Intel Corporation
+* Copyright 2026 Arm Ltd. and affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -65,6 +66,7 @@ struct base_perf_report_t {
     virtual void dump_cfg(std::ostream &) const { SAFE_V(FAIL); }
     virtual void dump_desc(std::ostream &) const { SAFE_V(FAIL); }
     virtual void dump_desc_csv(std::ostream &) const { SAFE_V(FAIL); }
+    virtual void dump_desc_csv_header(std::ostream &s) const { s << "desc"; }
     virtual void dump_flags(std::ostream &) const { SAFE_V(FAIL); }
     virtual void dump_rnn_activation(std::ostream &) const { SAFE_V(FAIL); }
     virtual void dump_rnn_direction(std::ostream &) const { SAFE_V(FAIL); }
@@ -83,6 +85,9 @@ struct base_perf_report_t {
         }
     }
 
+    void dump_perf_csv_header() const;
+    void handle_csv_header_option(std::ostream &s, const char *&option) const;
+
     static timer::timer_t::mode_t modifier2mode(char c) {
         if (c == '-') return timer::timer_t::min;
         if (c == '0') return timer::timer_t::avg;