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2016 Jan 09
4
Attribute for a invariant function ?
I have a read-only lookup table, which takes integer arguments. Optimally I would like to indicate in the C source, that the function is invariant (?), so that the superflous calls can be optimized away. ``` extern void *lookup( int a); void foo( void) { void *a, *b; a = lookup( 0x12345678); bar( a); b = lookup( 0x12345678); // b guaranteed to be the same as a, no call