XPost: alt.folklore.computers   
   From: vallor@cultnix.org   
      
   On Tue, 5 Aug 2025 01:41:15 -0000 (UTC), Lawrence D'Oliveiro wrote:   
      
   > On Mon, 4 Aug 2025 23:24:15 -0000 (UTC), Waldek Hebisch wrote:   
   >   
   >> BTW: AMD-64 was a special case: since 64-bit mode was bundled with   
   >> increasing number of GPR-s, with PC-relative addressing and with   
   >> register-based call convention on average 64-bit code was faster than   
   >> 32-bit code.  And since AMD-64 was relatively late in 64-bit game there   
   >> was limited motivation to develop mode using 32-bit addressing and   
   >> 64-bit instructions. It works in compilers and in Linux, but support is   
   >> much worse than for using 64-bit addressing.   
   >   
   > Intel was trying to promote this in the form of the “X32” ABI. The Linux   
   > kernel and some distros did include support for this. I don’t think it was   
   > very popular, and it may be extinct now.   
      
   It's still in the Linux kernel, but off by default.   
      
   arch/x86/Kconfig   
      
   I went to an O'Reilly "Foo Camp" where AMD was showing off their   
   new 64-bit processor.  Found it fascinating, if a little over my   
   head.  But I did gather that the instruction set made sense for transitioning   
   from 32-bit software, and I think Intel missed the boat with their IA-64.   
      
   (And I have memories of when Intel started making "EM64T" processors...)   
      
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