Re: My 66000 and High word facility

On Mon, 12 Aug 2024 20:58:45 +0000, BGB wrote:

On 8/12/2024 3:12 PM, MitchAlsup1 wrote:

See polpak:: r8_erf()
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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
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All of the constants are use once !
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RISC-V takes 240 instructions and uses 342 words of
memory {.text, .data, .rodata}
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My 66000 takes 85 instructions and uses 169 words of
memory {.text, .data, .rodata}

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FWIW:
   FADD Rm, Imm64f, Rn  //XG2 Only
   FADD Rm, Imm56f, Rn  //
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And:
   FMUL Rm, Imm64f, Rn  //XG2 Only
   FMUL Rm, Imm56f, Rn  //
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Why don't yuo download polpack, compile it, and state how many
instructions it takes and how many words of storage it takes ??