DOS ain't dead

rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) (Developers)

posted by marcov, 22.03.2020, 13:08

> The 486 and 586 didn't add much (not counting MMX, 3DNow!), so I felt I
> should keep those. But everything else (Cyrix, MMX, 3DNow!, P6, IA64
> [JMPE], SSE[123]) I deleted. I also had to use "-d" (merge duplicate

(P6 has a highly useful cmov that reduces branching, and is a substitute for a branch instruction and a mov. IIRC it is 3 bytes and replaces a one byte branch and two bytes mov. (in both cases + size of imm), equal size, better performance)

> BTW, I heard that newer AMD cpus don't even have 3DNow! anymore. And even
> Intel was rumored to be tweaking compilers (GCC?) to target SSE2 with MMX
> intrinsics (so they could remove them from chips later?? dunno). Something
> weird like that.

More likely the other way around. SSE2 is a core (non optional) aspect of the x86_64 architecture, the older SIMD implementations not, and aren't really used much anymore.

Note that SSE is the first 128-bit one, while earlier ones are 64-bit.

Complete thread:

• rebuilding NASM 0.98.39 (2005) for 16-bit 8086 host - Rugxulo, 14.03.2020, 08:13 (Developers)
  • rebuilding NASM 0.98.39 (2005) for 16-bit 8086 host - Rugxulo, 16.03.2020, 01:24
    • rebuilding NASM 0.98.39 (2005) for 16-bit 8086 host - rr, 16.03.2020, 15:22
      • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - Rugxulo, 17.03.2020, 05:20
        • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - ecm, 17.03.2020, 06:58
          • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - Rugxulo, 22.03.2020, 00:48
            • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - ecm, 22.03.2020, 10:13
              • rebuilding NASM 2.09 and NASM compatibility - ecm, 22.03.2020, 11:45
            • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - ecm, 06.09.2020, 23:09
        • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - Rugxulo, 22.03.2020, 00:42
          • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - marcov, 22.03.2020, 13:08
            • CMOV - ecm, 22.03.2020, 14:26
              • CMOV - marcov, 22.03.2020, 18:32
                • CMOV - marcov, 23.03.2020, 12:52
            • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - Rugxulo, 23.03.2020, 04:27
              • NASM 0.98.39 (MSC 7, "286", not full instruction support) - Rugxulo, 24.03.2020, 20:36
                • NASM 0.98.39 (not full instruction support) - Rugxulo, 24.03.2020, 21:16
                  • NASM 0.98.39 (not full instruction support) - ecm, 24.03.2020, 22:55
                    • NASM 0.98.39 (not full instruction support) - Rugxulo, 24.03.2020, 23:17
                  • NASM 0.98.39 (not full instruction support) ... LOADALL - Rugxulo, 31.03.2020, 20:07
              • rebuilding NASM 0.98.39 (without MMX/3DNOW/686/SSE) - Rugxulo, 13.04.2020, 07:16
            • deprecated MMX and obsolete 3DNow! - Rugxulo, 24.03.2020, 17:54