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Make the C implementation default to using NEON on aarch64

This commit is contained in:
rsdy 2021-10-08 12:45:04 +01:00
parent faddc5af5c
commit c5941a2731
3 changed files with 20 additions and 3 deletions
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4
c/Makefile.testing
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@ -42,6 +42,10 @@ EXTRAFLAGS += -DBLAKE3_USE_NEON
TARGETS += blake3_neon.o
endif
ifdef BLAKE3_NO_NEON
EXTRAFLAGS += -DBLAKE3_NO_NEON
endif
all: blake3.c blake3_dispatch.c blake3_portable.c main.c $(TARGETS)
$(CC) $(CFLAGS) $(EXTRAFLAGS) $^ -o $(NAME) $(LDFLAGS)

15
c/README.md
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@ -250,15 +250,24 @@ gcc -shared -O3 -o libblake3.so -DBLAKE3_NO_SSE2 -DBLAKE3_NO_SSE41 -DBLAKE3_NO_A
## ARM NEON
The NEON implementation is not enabled by default on ARM, since not all
ARM targets support it. To enable it, set `BLAKE3_USE_NEON=1`. Here's an
example of building a shared library on ARM Linux with NEON support:
The NEON implementation is enabled by default on AARCH64, but not on
other ARM targets, since not all of them support it. To enable it, set
`BLAKE3_USE_NEON=1`. Here's an example of building a shared library on
ARM Linux with NEON support:
```bash
gcc -shared -O3 -o libblake3.so -DBLAKE3_USE_NEON blake3.c blake3_dispatch.c \
blake3_portable.c blake3_neon.c
```
To explicitiy disable using NEON instructions on AARCH64, set
`BLAKE3_NO_NEON=1`.
```bash
gcc -shared -O3 -o libblake3.so -DBLAKE3_NO_NEON blake3.c blake3_dispatch.c \
blake3_portable.c
```
Note that on some targets (ARMv7 in particular), extra flags may be
required to activate NEON support in the compiler. If you see an error
like...

4
c/blake3_impl.h
View File

@ -45,6 +45,10 @@ enum blake3_flags {
#include <immintrin.h>
#endif
#if defined(__aarch64__) && !defined(BLAKE3_NO_NEON) && !defined(BLAKE3_USE_NEON)
#define BLAKE3_USE_NEON
#endif
#if defined(IS_X86)
#define MAX_SIMD_DEGREE 16
#elif defined(BLAKE3_USE_NEON)