CFLAGS are always appended to the end of gcc options when compiling
sources in autotools based projects. Configure tests should do the
same. Otherwise build fails on PPC when using CFLAGS="-O2 -mno-altivec"
for example. Similar problem affects ARM.
This can help to fix build problems with '-mthumb' gcc option in CFLAGS.
ARMv6 optimized code can't be compiled for thumb (because of its inline
assembly) and gets automatically disabled in configure. Reference
to it from NEON optimized code resulted in linking problems.
Every ARMv6 optimized fast path function also has a better NEON
counterpart, so there is no need to fallback to ARMv6. Shorter
delegate chain should additionally result in a bit better performance.
CFLAGS are always appended to the end of gcc options when compiling
sources in autotools based projects. Configure tests should do the
same. Otherwise build fails on PPC when using CFLAGS="-O2 -mno-altivec"
for example. Similar problem affects ARM.
This can help to fix build problems with '-mthumb' gcc option in CFLAGS.
ARMv6 optimized code can't be compiled for thumb (because of its inline
assembly) and gets automatically disabled in configure. Reference
to it from NEON optimized code resulted in linking problems.
Every ARMv6 optimized fast path function also has a better NEON
counterpart, so there is no need to fallback to ARMv6. Shorter
delegate chain should additionally result in a bit better performance.
Autoconf's AC_PROG_CC sets the default CFLAGS to -O2 -g for
gcc and -g for every other compiler. This patch defaults
CFLAGS to the equivalent -O -g when we're using Sun Studio's cc
if the user or site admin hasn't already set CFLAGS.
Calling a static function wrapper around _mm_set_epi32() when not
using optimisation causes Sun Studio 12's cc to emit a spurious
floating point load which confuses the assembler. Using a macro wrapper
rather than a function steps around the problem.
Autoconf's AC_PROG_CC sets the default CFLAGS to -O2 -g for
gcc and -g for every other compiler. This patch defaults
CFLAGS to the equivalent -O -g when we're using Sun Studio's cc
if the user or site admin hasn't already set CFLAGS.
Calling a static function wrapper around _mm_set_epi32() when not
using optimisation causes Sun Studio 12's cc to emit a spurious
floating point load which confuses the assembler. Using a macro wrapper
rather than a function steps around the problem.
Some versions of gcc (cs2009q1, 4.4.1) incorrectly reject
shift operand having value >= 8, claiming that it is out of
range. So inline assembly is used as a workaround.
Some versions of gcc (cs2009q1, 4.4.1) incorrectly reject
shift operand having value >= 8, claiming that it is out of
range. So inline assembly is used as a workaround.
This is one example of a compiler warning that was lost amit the build
noise.
The error here is that in a list of required conditions we used ';'
instead of '&&' with the result of continuing to use the fast-path
even if we had a wide mask.
Another error is that it was testing src, not mask as it should.
Inline assembly for handling <8 pixels width did not pass blitters-test.
Fortunately gcc has no problems compiling alternative implementation
which is using RVCT style intrinsics, so it can be used instead.
The code and overall method is mostly based on scaling-test. This one
focuses on trying to stress as many different color formats and types
of composition operations as possible.
This is an initial implementation which may need more tuning. Also
not all color format and operator combinations are actually used.
When cpu specific optimizations are disabled, this test provides
identical deterministic results on x86, PPC and ARM.
Script blitters-test-bisect.rb now works in non-stop mode, until
it finds any problem. This allows to run it for example overnight
in order to test a lot more variants of pixman calls and increase
chances of detecting problems in pixman. Just like with scaling-test,
running blitters-test binary alone with no command line arguments
runs a small predefined number of tests and compares checksum
with a reference value for quick verification.
