Lennart Sorensen: Re: Performance difference 32 bit/64bit userland. (E-Mail) In: DebianMailing Lists. 7. Februar 2017, abgerufen am 7. Oktober 2022 (englisch): „x86 is different. AMD did a nice job fixing a lot of mistakes in x86 as part of designing the 64 bit version of x86. The big changes are to double the number of registers, since the x86 has always been terribly register starved. This alone accounts for most of the performance improvements you see on 64 bit x86. … Most architectures other than x86 loose a bit of speed in 64 bit mode compared to 32 bit mode unless they make other architectural improvements at the same time (as x86 did).“
Christoph Biedl: Performance difference 32 bit/64bit userland. (E-Mail) In: linux.debian.ports.powerpc.Google Groups, 17. Februar 2017, abgerufen am 7. Oktober 2022 (englisch): „… two hosts with identical hardware (LPARs on IBM POWER): [1] powerpc (64 bit kernel, 32 bit userland) [2] ppc64 (64 bit kernel, 64 bit userland) … Now the surprise: Using the 32 bit userland, CPU bound operations like gzip or xz are significantly faster (5 to 10 percent).“
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Hollis Blanchard: PowerPC assembly – Introduction to assembly on the PowerPC. In: IBM Developer – Linux. 30. Juni 2002, abgerufen am 7. Oktober 2022 (englisch): „The PowerPC Architecture Specification, released in 1993, is a 64-bit specification with a 32-bit subset.“