src: cpu: conv: jit_uni_x8s8s32x: dst scale: reuse vmm register

Author: igorsafo

src/cpu/x64/jit_uni_x8s8s32x_conv_kernel.cpp

@@ -1,5 +1,5 @@
 /*******************************************************************************
-* Copyright 2019-2022 Intel Corporation
+* Copyright 2019-2023 Intel Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -900,16 +900,14 @@ void _jit_uni_x8s8s32x_fwd_kernel<isa, Vmm>::generate() {
 
     if (jcp.is_depthwise) {
         const bool is_zero_point = jcp.src_zero_point || jcp.dst_zero_point;
-        // dst zero point and dst scale reuse the same register
-        int idx = ker_max_reg + 1 - jcp.max_regs_ur
-                - nstl::max(2 * is_zero_point, static_cast<int>(jcp.dst_scale));
+        int idx = ker_max_reg + 1 - jcp.max_regs_ur - 2 * is_zero_point;
         if (!jcp.is_resrc_depthwise) vmm_dw_src = Vmm(--idx);
         if (!jcp.has_vnni) vmm_dw_tmp = Vmm(--idx);
         if (jcp.signed_input) {
             --idx; // due to extra register used for compensations
         }
-        assert(IMPLICATION(!jcp.dst_scale && !is_zero_point,
-                idx == ker_max_reg - ker_dw_reg_base_idx));
+        assert(IMPLICATION(
+                !is_zero_point, idx == ker_max_reg - ker_dw_reg_base_idx));
     }
 
     if (!jcp.is_depthwise && (!jcp.has_vnni)) {
@@ -1359,7 +1357,6 @@ status_t jit_uni_x8s8s32x_fwd_kernel<isa>::init_conf(jit_conv_conf_t &jcp,
         jcp.max_regs_ur = jcp.has_vnni ? 15 - jcp.signed_input : 12;
     }
 
-    if (jcp.dst_scale) jcp.max_regs_ur = 10;
     if (jcp.src_zero_point || jcp.dst_zero_point) jcp.max_regs_ur = 9;
 
     auto set_or_check_wei_format = [&]() {

src/cpu/x64/jit_uni_x8s8s32x_conv_kernel.hpp

@@ -1,5 +1,5 @@
 /*******************************************************************************
-* Copyright 2019-2022 Intel Corporation
+* Copyright 2019-2023 Intel Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -113,7 +113,7 @@ struct _jit_uni_x8s8s32x_fwd_kernel : public jit_generator {
     const Vmm vmm_zp_comp = vmm_zp_one;
     const Vmm vmm_zp_dw_tmp = vmm_zp_one;
     /* dst scale */
-    const Vmm vmm_dst_scale = Vmm(5);
+    const Vmm vmm_dst_scale = Vmm(0);
 
     /* used in compute_ker (but set during prepare_output) */
     const Vmm vmm_shift = Vmm(1); // only for signed input