glsl: skip comparison opt when adding vars of different size
The spec allows adding scalars with a vector or matrix. In this case
the opt was losing swizzle and size information.
This fixes a bug with Doom (2016) shaders.
Fixes: 34ec1a24d6
("glsl: Optimize (x + y cmp 0) into (x cmp -y).")
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
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@ -709,6 +709,12 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
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if (!is_vec_zero(zero))
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continue;
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/* We are allowed to add scalars with a vector or matrix. In that
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* case lets just exit early.
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*/
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if (add->operands[0]->type != add->operands[1]->type)
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continue;
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/* Depending of the zero position we want to optimize
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* (0 cmp x+y) into (-x cmp y) or (x+y cmp 0) into (x cmp -y)
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*/
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