Turns out we are not doing this correctly in SM1, because the rounding
should be to the number that is closer to zero and lower_casts_to_int()
doesn't do that.
A vertex shader test is added since in SM1 they must rely on the SLT
operation instead of the CMP operation.
fxc compiles this method even without the backcompat option.
Furthermore, it even does it on ps_2_0 despite the fact that it maps to
a texldd instruction, which is not available on plain ps_2_0, nor ps_2_b,
only on ps_2_a and ps_3_0 according to documentation.
It is worth mentioning that the additional offset parameter is not
supported when lowering.
Otherwise ubsan reports these errors on the bitwise.shader_test:
libs/vkd3d-shader/hlsl_constant_ops.c:970:50: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
libs/vkd3d-shader/hlsl_constant_ops.c:970:50: runtime error: left shift of negative value -12
We apply distributivity to applicable expressions, specifically with
the following rewrite rules:
(x OPL a) OPR (x OPL b) -> x OPL (a OPR b)
(y OPR (x OPL a)) OPR (x OPL b) -> y OPR (x OPL (a OPR b))
((x OPL a) OPR y) OPR (x OPL b) -> (x OPL (a OPR b)) OPR y
(x OPL a) OPR ((x OPL b) OPR y) -> (x OPL (a OPR b)) OPR y
(x OPL a) OPR (y OPR (x OPL b)) -> (x OPL (a OPR b)) OPR y
where a, b are constants.
Adjust the algorithm for deciding for which profiles to test compilation.
We first ensure that if the compilation result changes (most often as the result
of a feature introduced in a specific version), we test the versions immediately
on either side of the change, to validate that vkd3d-shader is emulating the
same version behaviour.
We then ensure that we are testing at least one version from each set of sm1,
sm4, and sm6.
