Benchmark testing different types of registers.

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Hmmmm... I am getting similar results with NOTHING and a single NOP... for hutchs last posting here

Back to the drawing board....

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  2418 nothing
  2714 1 single nop
  2481 nothing
  2589 1 single nop
  2528 nothing
  2823 1 single nop
  2153 nothing
  2293 1 single nop
  2075 nothing
  2231 1 single nop
  2168 nothing
  2418 1 single nop
  2496 nothing
  2699 1 single nop
  2746 nothing
  3074 1 single nop

  Results

  2383 nothing average
  2605 single nop average

Press any key to continue...


Code: [Select]

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    include \masm32\include64\masm64rt.inc

    .code

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entry_point proc

    call testproc

    waitkey

    invoke ExitProcess,0

    ret

entry_point endp

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    iterations equ <1000000000>

 testproc proc

    LOCAL mem1  :QWORD
    LOCAL mem2  :QWORD
    LOCAL mem3  :QWORD
    LOCAL mem4  :QWORD
    LOCAL mem5  :QWORD
    LOCAL mem6  :QWORD
    LOCAL mem7  :QWORD
    LOCAL cnt1  :QWORD
    LOCAL cnt2  :QWORD
    LOCAL time  :QWORD

    LOCAL rslt1 :QWORD
    LOCAL rslt2 :QWORD

    USING rsi, rdi, rbx, r12, r13, r14, r15

    SaveRegs

    HighPriority

    mov rslt1, 0
    mov rslt2, 0

    mov cnt2, 8

  loopstart:

  ; ------------------------------------

    cpuid

    call GetTickCount
    mov time, rax

    mov cnt1, iterations
  @@:
    sub cnt1, 1
    jnz @B

    call GetTickCount
    sub rax, time
    add rslt1, rax
    conout "  ",str$(rax)," nothing",lf

  ; ------------------------------------

    cpuid

    call GetTickCount
    mov time, rax

    mov cnt1, iterations
  @@:
    nop
    sub cnt1, 1
    jnz @B

    call GetTickCount
    sub rax, time
    add rslt2, rax
    conout "  ",str$(rax)," 1 single nop",lf

  ; ------------------------------------

    sub cnt2, 1
    jnz loopstart

    shr rslt1, 3
    shr rslt2, 3

    conout lf,"  Results",lf,lf

    conout "  ",str$(rslt1)," nothing average",lf
    conout "  ",str$(rslt2)," single nop average",lf,lf

    NormalPriority

    RestoreRegs

    ret

 testproc endp

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    end


Seems the timing  code is taking up most of the time, or the reg/mem moves are as fast as nothing or a single nop.

later I tried 100 nop's and the 100 nop's were faster than nothing. No extra alignment, same code otherwise.