+bool targets_overlap(const Assignment::Target &target1, const Assignment::Target &target2)
+{
+ bool overlap = (target1.declaration==target2.declaration);
+ for(unsigned i=0; (overlap && i<target1.chain_len && i<target2.chain_len); ++i)
+ {
+ Assignment::Target::ChainType type1 = static_cast<Assignment::Target::ChainType>(target1.chain[i]&0xC0);
+ Assignment::Target::ChainType type2 = static_cast<Assignment::Target::ChainType>(target2.chain[i]&0xC0);
+ unsigned index1 = target1.chain[i]&0x3F;
+ unsigned index2 = target2.chain[i]&0x3F;
+ if(type1==Assignment::Target::SWIZZLE || type2==Assignment::Target::SWIZZLE)
+ {
+ if(type1==Assignment::Target::SWIZZLE && type2==Assignment::Target::SWIZZLE)
+ overlap = index1&index2;
+ else if(type1==Assignment::Target::ARRAY && index1<4)
+ overlap = index2&(1<<index1);
+ else if(type2==Assignment::Target::ARRAY && index2<4)
+ overlap = index1&(1<<index2);
+ // Treat other combinations as overlapping (shouldn't happen)
+ }
+ else
+ overlap = (type1==type2 && (index1==index2 || index1==0x3F || index2==0x3F));
+ }
+
+ return overlap;
+}
+