i965: Fix negate with unsigned integers
For code such as:
uint tmp1 = uint(in0);
uint tmp2 = -tmp1;
float out0 = float(tmp2);
We produce code like:
mov(8) g5<1>.xF -g9<4,4,1>.xUD
which does not produce correct results. This code produces the
results we would expect if tmp1 and tmp2 were signed integers
instead.
It seems that a similar problem was detected and addressed when
using negations with unsigned integers as part of condionals, but
it looks like the problem has a wider impact than that.
This patch fixes the problem by preventing copy-propagation of
negated UD registers in all scenarios, not only in conditionals.
Fixes the following 24 dEQP tests:
dEQP-GLES3.functional.shaders.operator.unary_operator.minus.*_uint_*
dEQP-GLES3.functional.shaders.operator.unary_operator.minus.*_uvec2_*
dEQP-GLES3.functional.shaders.operator.unary_operator.minus.*_uvec3_*
dEQP-GLES3.functional.shaders.operator.unary_operator.minus.*_uvec4_*
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
2 files changed