[Mesa-dev] [PATCH] glsl: Avoid calling get_array_element for scalar constants

[Tapani Pälli]

On 08/16/2018 02:21 AM, Andres Gomez wrote:
> Danylo, should we also include this in the stable queues ?

Yep makes sense, it's simple and fixes a crasher.

> 
> On Mon, 2018-08-13 at 18:57 +0300, Danylo Piliaiev wrote:
>> Accessing scalar constant as an array in function call or
>> initializer list triggered assert in get_array_element.
>> Examples:
>>     func(0[0]);
>>     vec2 t = { 0[0], 0 };
>>
>> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107550
>>
>> Signed-off-by: Danylo Piliaiev <danylo.piliaiev at globallogic.com>
>> ---
>>   src/compiler/glsl/ir_constant_expression.cpp | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/src/compiler/glsl/ir_constant_expression.cpp b/src/compiler/glsl/ir_constant_expression.cpp
>> index 4a0aff72c6..c9788c7053 100644
>> --- a/src/compiler/glsl/ir_constant_expression.cpp
>> +++ b/src/compiler/glsl/ir_constant_expression.cpp
>> @@ -826,7 +826,7 @@ ir_dereference_array::constant_expression_value(void *mem_ctx,
>>            const unsigned component = idx->value.u[0];
>>   
>>            return new(mem_ctx) ir_constant(array, component);
>> -      } else {
>> +      } else if (array->type->is_array()) {
>>            const unsigned index = idx->value.u[0];
>>            return array->get_array_element(index)->clone(mem_ctx, NULL);
>>         }