Implement pointer difference arithmetic #266
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This commit adds comprehensive pointer difference support (ptr1 - ptr2) that was missing from the existing pointer arithmetic implementation: - Pointer difference calculation: It computes element count by dividing byte difference by element size (char=1, int=4, etc.) - Expression support: Enables complex expressions like *(p + (q - r)) - Unified element size detection: Consistent logic for both regular and typedef pointers across all arithmetic operations
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This commit adds comprehensive pointer difference support (
ptr1 - ptr2) that was missing from the existing pointer arithmetic implementation:*(p + (q - r))