What is the difference allocate a memory with new global and local
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I'm not familiar with that flavour of assembler, but there's still a "li %r3,4 ; bl _Znwj" set of instructions in both versions, the only differences are (i) when those instructions are executed and (ii) what's done with the pointer.
In the first version, the memory only gets allocated as part of the main() function, but in the second version the memory is allocated before main() is ever entered - gcc inserts code before (and after) your main() function to do this.
And when you call new in your main() function the returned pointer is (presumably) moved onto the stack, but if fptr is global, "lwz %r4,20(%r1)" moves the pointer to the allocated memory to where fptr is in memory.