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by mike_hock
3695 days ago
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> Example: you pass an object by value, and only read one field, can it optimize this? Yes. struct S { int a,b; };
void foo(int); // Some external function
void bar(S s) { foo(s.a); }
void baz() { bar(S{42, 55}); }
compiles the baz function to (-O2 on GCC 4.9) movl $42, %edi
jmp _Z3fooi
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