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This adds two new util functions to rounding.h, _mesa_iroundf and
mesa_lround, which are just wrappers around roundf and round, that cast
to int and long int respectively. This is possible since mesa recently
dropped support for VC2013, since 2015 and 2017 support roundf.
Reviewed-by: Marek Olšák <[email protected]>
Reviewed-by: Kristian H. Kristensen <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3024>
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This is not true for MSVC on ARM.
Signed-off-by: Erik Faye-Lund <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
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This code generates CVTSD2SI, which requires SSE2. So let's fix the
required SSE-version.
Signed-off-by: Erik Faye-Lund <[email protected]>
Fixes: 5de29ae (util: try to use SSE instructions with MSVC and 32-bit gcc)
Reviewed-by: Matt Turner <[email protected]>
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This always returns a int64_t, translating to _mesa_lroundevenf on
systems where long is 64-bit, and llrintf where "long long" is needed.
Fixes: 594fc0f8595 ("mesa: Replace F_TO_I() with _mesa_lroundevenf().")
Reviewed-by: Marek Olšák <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
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The lrint() and lrintf() functions are pretty slow and make some
texture transfers very inefficient. This patch makes a better effort
at using those intrisics for 32-bit gcc and MSVC.
Note, this patch doesn't address the use of SSE4.1 with MSVC.
v2: get rid of the ROUND_WITH_SSE symbol, per Matt.
Reviewed-by: José Fonseca <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
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Needed for rint/rintf.
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More portable. Based on Roland Scheidegger's idea.
Tested with roundevent_test on Linux, MinGW, and MSVC.
https://bugs.freedesktop.org/show_bug.cgi?id=91591
Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
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Reviewed-by: Roland Scheidegger <[email protected]>
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Neither MSVC nor MinGW defines LONG_BIT. For MSVC this was not a problem as
it doesn't define __x86_64__ macro (it's GCC specific.)
However on Windows long type is guaranteed to be 32bits.
Also add an #error, as GCC will just warn, not throw any error, when no
value is returned.
Trivial.
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gcc actually generates this for us now that we use -fno-math-errno
(which is weird, since lrintf()/lrint() don't set errno) but clang still
does not. Presumably helps MSVC as well.
Reduced .text size by 8.5k with gcc before -fno-math-errno.
text data bss dec hex filename
4935850 195136 26192 5157178 4eb13a i965_dri.so before
4927225 195128 26192 5148545 4e8f81 i965_dri.so after
Reviewed-by: Roland Scheidegger <[email protected]>
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I'm not sure what the true meaning of "The rounding mode may vary." is,
but it is the case that the IROUND() path rounds differently than the
other paths (and does it wrong, at that).
Like _mesa_roundeven{f,}(), just add an use _mesa_lroundeven{f,}() that
has known semantics.
Reviewed-by: Roland Scheidegger <[email protected]>
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The SSE 4.1 ROUND instructions let us implement roundeven directly.
Otherwise we assume that the rounding mode has not been modified (as we
do in the rest of Mesa) and use rint().
glibc uses the ROUND instruction in rint() after a cpuid check. This
patch just lets us inline it directly when we're already building for
SSE 4.1.
Reviewed-by: Carl Worth <[email protected]>
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Eric's initial patch adding constant expression evaluation for
ir_unop_round_even used nearbyint. The open-coded _mesa_round_to_even
implementation came about without much explanation after a reviewer
asked whether nearbyint depended on the application not modifying the
rounding mode. Of course (as Eric commented) we rely on the application
not changing the rounding mode from its default (round-to-nearest) in
many other places, including the IROUND function used by
_mesa_round_to_even!
Worse, IROUND() is implemented using the trunc(x + 0.5) trick which
fails for x = nextafterf(0.5, 0.0).
Still worse, _mesa_round_to_even unexpectedly returns an int. I suspect
that could cause problems when rounding large integral values not
representable as an int in ir_constant_expression.cpp's
ir_unop_round_even evaluation. Its use of _mesa_round_to_even is clearly
broken for doubles (as noted during review).
The constant expression evaluation code for the packing built-in
functions also mistakenly assumed that _mesa_round_to_even returned a
float, as can be seen by the cast through a signed integer type to an
unsigned (since negative float -> unsigned conversions are undefined).
rint() and nearbyint() implement the round-half-to-even behavior we want
when the rounding mode is set to the default round-to-nearest. The only
difference between them is that nearbyint() raises the inexact
exception.
This patch implements _mesa_roundeven{f,}, a function similar to the
roundeven function added by a yet unimplemented technical specification
(ISO/IEC TS 18661-1:2014), with a small difference in behavior -- we
don't bother raising the inexact exception, which I don't think we care
about anyway.
At least recent Intel CPUs can quickly change a subset of the bits in
the x87 floating-point control register, but the exception mask bits are
not included. rint() does not need to change these bits, but nearbyint()
does (twice: save old, set new, and restore old) in order to raise the
inexact exception, which would incur some penalty.
Reviewed-by: Carl Worth <[email protected]>
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