calling 32-bit printf from 64-bit binary?

[matsp]

On the other hand, by not moving to the r** registers, but using the e** registers instead, the compiler saves a byte for the "large operand" instruction prefix that is required for many 64-bit opcodes.

Not to mention the four bytes saved by not using a 64-bit operand on the %RDI load constant that would be all zero anyways.

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Mats