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From: BGB <cr88192@gmail.com>
Newsgroups: comp.arch
Subject: Re: My 66000 and High word facility
Date: Wed, 14 Aug 2024 19:45:32 -0500
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On 8/14/2024 5:43 PM, MitchAlsup1 wrote:
> On Wed, 14 Aug 2024 10:15:58 +0000, BGB wrote:
> 
>> On 8/13/2024 12:24 PM, MitchAlsup1 wrote:
>>
>> Assuming I use all of the ISA features that currently exist:
>>
>> r8_erf:                                 ; @r8_erf
>>       MOV     R4, R1
>>       FABS    R1,R2
>>       FCMPGT  0x3780, R2  //Half
>>       BF      .LBB141_5
>>
>>       FCMPGT  0x4400, R2  //Half
>>       BF      .LBB141_6
>>
>>       FCMPGE  0x403A8B020C49BA5E, R2
>>       BT      .LBB141_7
>>
>>       FMUL    R1, R1, R3
>>       FLDCH   0x3C00, R2
>>       FDIV    R2, R3, R3
>>       MOV     0x3F90B4FB18B485C7, R4
>>       MOV     0x3FD38A78B9F065F6, R16
>>       FMAC    R3, R16, R4, R4
>>       FADD    R3, 0x40048C54508800DB, R5
>>
>>       MOV     0x3FD70FE40E2425B8, R16
>>       FMAC    R3, R16, R4, R4
>>
>>       MOV     0x3FFDF79D6855F0AD, R16
>>       FMAC    R3, R16, R5, R5
>>
>>       MOV     0x3FC0199D980A842F, R16
>>       FMAC    R3, R16, R4, R4
>>       MOV     0x3FE0E4993E122C39, R16
>>       FMAC    R3, R16, R5, R5
>>       MOV     0x3F9078448CD6C5B5, R16
>>       FMAC    R3, R16, R4, R4
>>       MOV     0x3FAEFC42917D7DE7, R16
>>       FMAC    R3, R16, R5, R5
>>       MOV     0x3F4595FD0D71E33C, R16
>>       FMAC    R3, R16, R4, R4
>>
>>       FMUL    R4,R3,R4
>>       MOV     0x3F632147A014BAD1, R16
>>       FMAC    R5, R3, R16, R3
>>       FDIV    R4, R3, R3
>>       FNEG    R3, R3
>>       FADD    R3, 0x3FE20DD750429B6D, R3
>>       FDIV    R3, R2, R3
>>       BRA     .LBB141_4
>> LBB141_5:
>>       FMUL    R1, R1, R3
>>       MOV     0, R4
>>       FCMPGT  0x3C9FFE5AB7E8AD5E, R2
>>       CSELT   R3, R4, R2
>>       MOV     0x3FC7C7905A31C322, R3
>>
>>       MOV     0x400949FB3ED443E9, R16
>>       fmac    R2, R16, R3, R3
>>       FADD    R2,#0x403799EE342FB2DE, R4
>>
>>       MOV     0x405C774E4D365DA3, R16
>>       RMAC    R2, R16, R3, R3
>>       MOV     0x406E80C9D57E55B8, R16
>>       FMAC    R2, R16, R4, R4
>>
>>       MOV     0x407797C38897528B, R16
>>       FMAC    R2, R16, R3, R3
>>       MOV     0x40940A77529CADC8, R16
>>       FMAC    R2, R16, R4, R4
>>       MOV     0x40A912C1535D121A, R16
>>       FMAC    R2, R16, R3, R3
>>
>>       FMUL    R3, R1, R1
>>       MOV     0x40A63879423B87AD, R16
>>       FMAC    R2, R16, R4, R2
>>       FDIV    R1, R2, R2
>>       RTS
>>
>> LBB141_6:
>>       MOV     0x3E571E703C5F5815, R3
>>       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    R2, 0x40300000, R4
>>       FMUL    R4, 0x3FB00000, R4
>>       FSTCI   R4, R4
>>       FLDCI   R4, R4
>>       FNEG    R4, R6
>>       fadd    R2, R6, R5
>>       fadd    R2, R4, R2
>>       fmul    R4, R6, R4
>>       fexp    r4,r4  //?
>>
>>       fmul    R2,R7, R2
>>       fexp    r2,r2
>>       fmul    R4, R2, R2
>>       FNEG    R2, R2
>>       fmac    r2,r2,r3,#0x3F000000
>>       fadd    r2,r2,#0x3F000000
>>       pdlt    r1,T  //?
>>       fadd    r2,#0,-r2
>>       RTS
>> LBB141_7:
>>       FLDCH    0xBC00, R2
>>       FLDCH    0x3C00, R3
>>       FCMPGT    0, R1
>>       CSELT    R2,R3,R2
>>       RTS
>>
> Not bad: I count 101 instructions and 183 words of memory.
> {{I checked nothing}}

I ran out of time (needed to go to sleep) and didn't finish translation, 
so the lower-case instructions were still mostly untranslated...


But, either way, apart from the FMAC situation there wasn't too much 
increase in the parts I did get translated. In theory, I could define an 
encoding for an Imm32f or Imm64 FMAC (although likely limited to 3R, 
unless I do something weird and define an "FE FF Op" 4RI Imm32 encoding 
scheme or similar).



Otherwise, I have needed to order a new SSD as the SSD holding my main 
OS drive seems to be failing (it is occasionally getting "stuck" at 100% 
activity for extended periods of time, starting just recently, but not a 
good sign).

I have had to reboot my PC several times as it "got stuck" and didn't 
come unstuck.


Granted, I think I have been using the same SSD now for around a decade, 
and these these things do have a finite lifespan. Got a new one the same 
size as the old one, and intend to try to image it; could have gotten a 
bigger one, but this drive uses MBR partitioning and all 4 partitions 
are already used. Can't change to GPR as the OS installation is using 
"Legacy BIOS" booting.

Bigger SSD/... would effectively require a new OS install (even if it 
would be nice to make the OS drive bigger; Win10 isn't really wanting to 
fit that well on a 300 GB partition).

Basically, PC is a "ship of Theseus" in some ways...

....
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