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[libpng16] Expand INSTALL instructions about enabling hardware optimizations.

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Glenn Randers-Pehrson 2017-07-06 20:17:09 -05:00
parent f380ae5243
commit 857ef82edf
1 changed files with 16 additions and 1 deletions
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17
INSTALL
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@ -285,7 +285,22 @@ those sections that are actually used will be loaded into memory.
XIV. Enabling or disabling hardware optimizations
Certain hardware capabilites, such as the Intel SSE instructions,
are normally detected at run time. If you wish to avoid using them,
are normally detected at run time. Enable them with configure options
such as one of
--enable-arm-neon=yes
--enable-mips-msa=yes
--enable-intel-sse=yes
--enable-powerpc-vsx=yes
or, if you are not using "configure", you can use one of
CPPFLAGS += "-DPNG_ARM_NEON"
CPPFLAGS += "-DPNG_MIPS_MSA"
CPPFLAGS += "-DPNG_INTEL_SSE"
CPPFLAGS += "-DPNG_POWERPC_VSX"
If you wish to avoid using them,
you can disable them via configure options such as
--enable-arm-neon=no, --enable-mips-msa=no, --enable-intel-sse=no,