On 02/01/15 21:16, Florian Klämpfl wrote: > Am 02.01.2015 um 19:31 schrieb Juha Manninen: >> Does it make sense to use PtrInt instead of Integer for optimization or code >> size reasons? > > Hard to say, but I wouldn't expect a benefit because bigger data types means > also more cache pollution. > >> In other words, does the compiler generate faster or smaller code in 64-bit >> CPUs for the native >> integer size? > > Normally the code is a little bit smaller (less sign extensions), but the > data footprint is bigger. > >> Does it depend on architecture? > > The comments above are probably valid for all 64 bit CPUs except alpha which > is not supported by fpc.
And except for AArch64, where 32 bit will, in principle, also be more efficient than 64 bit in all cases. It can even use the lower 8/16/32 bit of a register as index in a memory references and sign/zero-extend + optionally multiply it with the access size. Jonas _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
