ARM32/Thumb2 ASM SHA-256: provide small code size option#9491
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dgarske merged 1 commit intowolfSSL:masterfrom Dec 4, 2025
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ARM32/Thumb2 ASM SHA-256: provide small code size option#9491dgarske merged 1 commit intowolfSSL:masterfrom
dgarske merged 1 commit intowolfSSL:masterfrom
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WOLFSSL_ARMASM_SHA256_SMALL for Thumb2 and ARM32 using base instructions compiles implementations that are smaller but slower.
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retest this please generic: |
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Reduces SHA256 by 1,472 bytes on Cortex-M. Test results:
STM32L4 - Cortex-M4 at 80MHz
190936 836 3656 195428 2fb64 STM32L4.elf
SHA-256 800 KiB took 1.012 seconds, 790.514 KiB/s
WOLFSSL_ARMASM_SHA256_SMALL
189464 836 3656 193956 2f5a4 STM32L4.elf
SHA-256 750 KiB took 1.000 seconds, 750.000 KiB/s
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Description
WOLFSSL_ARMASM_SHA256_SMALL for Thumb2 and ARM32 using base instructions compiles implementations that are smaller but slower.
Fixes zd#20831
Testing
./configure --disable-shared LDFLAGS=--static --host=armv7m CC=arm-linux-gnueabi-gcc --enable-armasm
./configure --disable-shared LDFLAGS=--static --host=armv7m CC=arm-linux-gnueabi-gcc --enable-armasm=sha256-small
../configure --disable-shared LDFLAGS=--static --host=armv7m CC=arm-linux-gnueabi-gcc --enable-armasm=inline
./configure --disable-shared LDFLAGS=--static --host=armv7m CC=arm-linux-gnueabi-gcc --enable-armasm=inline,sha256-small
./configure --disable-shared LDFLAGS=--static --host=armv6 CC=arm-linux-gnueabi-gcc --enable-armasm
./configure --disable-shared LDFLAGS=--static --host=armv6 CC=arm-linux-gnueabi-gcc --enable-armasm=sha256-small
/configure --disable-shared LDFLAGS=--static --host=armv6 CC=arm-linux-gnueabi-gcc --enable-armasm=inline
./configure --disable-shared LDFLAGS=--static --host=armv6 CC=arm-linux-gnueabi-gcc --enable-armasm=inline,sha256-small
Checklist