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----Snip-- struct st1{ int a; }; struct st2{ int b; }; struct st { struct st1 obj1; struct st2 obj2; }Obj; int test1(struct st1 * ptr1 , struct st2 * ptr2, struct st2 *ptr3) { ptr1->a = 10; *ptr3 = *ptr2; return ptr1->a; } --Snip--- For the above case GCC is able to store forward the value 10 to the return place. LLVM is not doing this. GCC https://godbolt.org/z/FCjCXy LLVM