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Tesseract does not support SIMD instructions on FreeBSD with amd64 #3964

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stweil opened this issue Nov 14, 2022 · 8 comments
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Tesseract does not support SIMD instructions on FreeBSD with amd64 #3964

stweil opened this issue Nov 14, 2022 · 8 comments
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@stweil
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stweil commented Nov 14, 2022 •
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The current autoconf build does not enable SIMD detection and compiler flags when running on FreeBSD for 64 bit AMD / Intel CPUs. This results in bad performance for text recognition and model training, and tesseract -v cannot show SIMD support (see #3960 (comment)).
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stweil commented Nov 14, 2022

I'll commit a fix.

@stweil stweil added the bug label Nov 14, 2022
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stweil commented Nov 14, 2022 •
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With a fix in configure.ac the compiler builds the code for SIMD , but the values from get_cpuid don't show any SIMD support when running FreeBSD in my test with a QEMU virtual machine. With commit adbefa8 Tesseract now uses SIMD instructions (also when running in a QEMU virtual machine).

stweil added a commit that referenced this issue Nov 14, 2022
@stweil
Fix AMD64 detection with autobuild on FreeBSD (#3964)
adbefa8 
Tesseract for FreeBSD was built without support for SSE4.1, AVX,
AVX2 or FMA because it uses a different value for `host_cpu`.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
@stweil stweil closed this as completed Nov 14, 2022
@stweil stweil mentioned this issue Nov 14, 2022
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stweil commented Nov 14, 2022

Cc @pkubaj who seems to be the maintainer for Tesseract on FreeBSD.

@amitdo
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amitdo commented Nov 14, 2022

https://gitlab.com/qemu-project/qemu/-/issues/164

@stweil
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stweil commented Nov 14, 2022

qemu -cpu host passes all host features through to the virtual machine.

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amitdo commented Nov 15, 2022

CMake:

if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86|x86_64|AMD64|amd64|i386|i686")
...
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm64|aarch64.*|AARCH64.*")

Should we do something similar with Autotools?

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stweil commented Nov 15, 2022 •
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I don't think that is necessary. See https://git.savannah.gnu.org/cgit/config.git/plain/config.guess for the values which can be detected automatically.

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stweil commented Nov 15, 2022 •
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FreeBSD provides an old version of config.guess (timestamp='2018-08-29') which returns amd64-unknown-freebsd13.1. The original config.guess returns x86_64 even on FreeBSD sind 2006, but the version which is distributed with FreeBSD was patched to return amd64.

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