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From: BGB <cr88192@gmail.com>
Newsgroups: comp.arch
Subject: Re: My 66000 and High word facility
Date: Mon, 12 Aug 2024 19:34:55 -0500
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On 8/12/2024 5:35 PM, MitchAlsup1 wrote:
> On Mon, 12 Aug 2024 20:58:45 +0000, BGB wrote:
> 
>> On 8/12/2024 3:12 PM, MitchAlsup1 wrote:
> 
>>> See polpak:: r8_erf()
>>>
>>>
>>> r8_erf:                                 ; @r8_erf
>>> ; %bb.0:
>>>      fabs    r2,r1
>>>      fcmp    r3,r2,#0x3EF00000
>>>      bngt    r3,.LBB141_5
>>> ; %bb.1:
>>>      fcmp    r3,r2,#4
>>>      bngt    r3,.LBB141_6
>>> ; %bb.2:
>>>      fcmp    r3,r2,#0x403A8B020C49BA5E
>>>      bnlt    r3,.LBB141_7
>>> ; %bb.3:
>>>      fmul    r3,r1,r1
>>>      fdiv    r3,#1,r3
>>>      mov    r4,#0x3F90B4FB18B485C7
>>>      fmac    r4,r3,r4,#0x3FD38A78B9F065F6
>>>      fadd    r5,r3,#0x40048C54508800DB
>>>      fmac    r4,r3,r4,#0x3FD70FE40E2425B8
>>>      fmac    r5,r3,r5,#0x3FFDF79D6855F0AD
>>>      fmac    r4,r3,r4,#0x3FC0199D980A842F
>>>      fmac    r5,r3,r5,#0x3FE0E4993E122C39
>>>      fmac    r4,r3,r4,#0x3F9078448CD6C5B5
>>>      fmac    r5,r3,r5,#0x3FAEFC42917D7DE7
>>>      fmac    r4,r3,r4,#0x3F4595FD0D71E33C
>>>      fmul    r4,r3,r4
>>>      fmac    r3,r3,r5,#0x3F632147A014BAD1
>>>      fdiv    r3,r4,r3
>>>      fadd    r3,#0x3FE20DD750429B6D,-r3
>>>      fdiv    r3,r3,r2
>>>      br    .LBB141_4
>>> LBB141_5:
>>>      fmul    r3,r1,r1
>>>      fcmp    r2,r2,#0x3C9FFE5AB7E8AD5E
>>>      sra    r2,r2,#8,#1
>>>      cvtsd    r4,#0
>>>      mux    r2,r2,r3,r4
>>>      mov    r3,#0x3FC7C7905A31C322
>>>      fmac    r3,r2,r3,#0x400949FB3ED443E9
>>>      fadd    r4,r2,#0x403799EE342FB2DE
>>>      fmac    r3,r2,r3,#0x405C774E4D365DA3
>>>      fmac    r4,r2,r4,#0x406E80C9D57E55B8
>>>      fmac    r3,r2,r3,#0x407797C38897528B
>>>      fmac    r4,r2,r4,#0x40940A77529CADC8
>>>      fmac    r3,r2,r3,#0x40A912C1535D121A
>>>      fmul    r1,r3,r1
>>>      fmac    r2,r2,r4,#0x40A63879423B87AD
>>>      fdiv    r2,r1,r2
>>>      mov    r1,r2
>>>      ret
>>> LBB141_6:
>>>      mov    r3,#0x3E571E703C5F5815
>>>      fmac    r3,r2,r3,#0x3FE20DD508EB103E
>>>      fadd    r4,r2,#0x402F7D66F486DED5
>>>      fmac    r3,r2,r3,#0x4021C42C35B8BC02
>>>      fmac    r4,r2,r4,#0x405D6C69B0FFCDE7
>>>      fmac    r3,r2,r3,#0x405087A0D1C420D0
>>>      fmac    r4,r2,r4,#0x4080C972E588749E
>>>      fmac    r3,r2,r3,#0x4072AA2986ABA462
>>>      fmac    r4,r2,r4,#0x4099558EECA29D27
>>>      fmac    r3,r2,r3,#0x408B8F9E262B9FA3
>>>      fmac    r4,r2,r4,#0x40A9B599356D1202
>>>      fmac    r3,r2,r3,#0x409AC030C15DC8D7
>>>      fmac    r4,r2,r4,#0x40B10A9E7CB10E86
>>>      fmac    r3,r2,r3,#0x40A0062821236F6B
>>>      fmac    r4,r2,r4,#0x40AADEBC3FC90DBD
>>>      fmac    r3,r2,r3,#0x4093395B7FD2FC8E
>>>      fmac    r4,r2,r4,#0x4093395B7FD35F61
>>>      fdiv    r3,r3,r4
>>> LBB141_4:
>>>      fmul    r4,r2,#16
>>>      fmul    r4,r4,#0x3D800000
>>>      rnd    r4,r4,#5
>>>      fadd    r5,r2,-r4
>>>      fadd    r2,r2,r4
>>>      fmul    r4,r4,-r4
>>>      fexp    r4,r4
>>>      fmul    r2,r2,-r5
>>>      fexp    r2,r2
>>>      fmul    r2,r4,r2
>>>      fadd    r2,#0,-r2
>>>      fmac    r2,r2,r3,#0x3F000000
>>>      fadd    r2,r2,#0x3F000000
>>>      pdlt    r1,T
>>>      fadd    r2,#0,-r2
>>>      mov    r1,r2
>>>      ret
>>> LBB141_7:
>>>      fcmp    r1,r1,#0
>>>      sra    r1,r1,#8,#1
>>>      cvtsd    r2,#-1
>>>      cvtsd    r3,#1
>>>      mux    r2,r1,r3,r2
>>>      mov    r1,r2
>>>      ret
>>>
>>> All of the constants are use once !
>>>
>>> RISC-V takes 240 instructions and uses 342 words of
>>> memory {.text, .data, .rodata}
>>>
>>> My 66000 takes 85 instructions and uses 169 words of
>>> memory {.text, .data, .rodata}
>>
>>
>> FWIW:
>>    FADD Rm, Imm64f, Rn  //XG2 Only
>>    FADD Rm, Imm56f, Rn  //
>>
>> And:
>>    FMUL Rm, Imm64f, Rn  //XG2 Only
>>    FMUL Rm, Imm56f, Rn  //
>>
> 
> Why don't yuo download polpack, compile it, and state how many
> instructions it takes and how many words of storage it takes ??

Found what I assume you are talking about.

Needed to add "polpak_test.c" as otherwise BGBCC lacks a main and prunes 
everything;
Also needed to hack over some compiler holes related to "complex 
_Double" to get it to build;
Also needed to stub over some library functions that were added in C99 
but missing in my C library.


So, initial result (BJX2 XG2):
   128K ".text";
    21K ".strtab" (strings)
     4K ".data"

Instruction Count:
   ~ 28K

This is with a static linked C library, but used one of the 
lighter-weight ones (that does not include the whole OS kernel linked in).


Seems to result in around 41K lines of ASM output, but this includes 
blank lines, comments, and labels.


This seems to be 117K with an x86-64 build (dynamically linked C library).

RV64G (riscv64-unknown-elf-gcc -O3):
   231K of ".text"

Did try "risc64-unknown-linux-gnu-gcc", but it broke due to apparently 
lacking "complex.h" and similar.



As for "r8_erf()":

<===

r8_erf:
   MOV          LR, R1
   BSR          __prolog_0005_00000200FFFF
   ADD          -800, SP
   MOV.Q        RQ4, (SP, 928)
   LEA.Q        (SP, 192), RQ3
   MOV.Q        RQ3, (SP, 184)
========== REMAINDER OF ARTICLE TRUNCATED ==========