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feat(newlib): riscv: add CONFIG_LIBC_OPTIMIZED_MISALIGNED_ACCESS config option

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This option replaces implementations of functions from ROM:
  - memcpy
  - memcmp
  - memmove
  - str[n]cpy
  - str[n]cmp

The functions used in the firmware will be better optimized for misaligned
memory. Here are some measurements in CPU cycles for 4096-byte buffers:

  memcpy:  28676 -> 4128
  memcmp:  49147 -> 14259
  memmove: 33896 -> 8086
  strcpy:  32771 -> 17313
  strcmp:  32775 -> 13191
This commit is contained in:
Alexey Lapshin
2025-03-26 15:18:54 +07:00
parent f3625b0fb0
commit ec68cb3300
46 changed files with 1049 additions and 58 deletions
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15
components/esp_rom/esp32c6/ld/esp32c6.rom.libc-suboptimal_for_misaligned_mem.ld Normal file
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@@ -0,0 +1,15 @@
/*
* SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/* These functions are not well optimized for misaligned memory access.
* See details in the https://sourceware.org/pipermail/newlib/2025/021470.html
* patch series. */
memcpy = 0x400004ac;
memmove = 0x400004b0;
memcmp = 0x400004b4;
strcpy = 0x400004b8;
strncpy = 0x400004bc;
strcmp = 0x400004c0;
strncmp = 0x400004c4;

9
components/esp_rom/esp32c6/ld/esp32c6.rom.libc.ld
View File

@@ -1,17 +1,10 @@
/*
* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
esp_rom_newlib_init_common_mutexes = 0x400004a4;
memset = 0x400004a8;
memcpy = 0x400004ac;
memmove = 0x400004b0;
memcmp = 0x400004b4;
strcpy = 0x400004b8;
strncpy = 0x400004bc;
strcmp = 0x400004c0;
strncmp = 0x400004c4;
strlen = 0x400004c8;
strstr = 0x400004cc;
bzero = 0x400004d0;