Arnd Bergmann <arnd@xxxxxxxx> writes: > On Friday, October 21, 2016 4:48:56 PM CEST Russell King - ARM Linux wrote: >> What's the point of the x32 mode? > > On x86, the motivation is faster code for most use cases that > don't need a lot of memory, as the 64-bit opcodes have 16 registers > rather than 8 in 32-bit mode but 32-bit pointers have lower > cache footprint than 64-bit pointers. For completness, the second point of x32 AFAIU is the IP-relative addressing which is not available in standard 32 bit mode, which improves PIC code. For simple not algorithmic code (think Android HAL for example) with many shared libraries, it's better in the Hardware Abstraction Layer Libraries, instead of the push-to-stack and pop register. Cheers. -- Robert -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
