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Example of the project nuts.Demo.Float128s for Lazarus
Use of the QScaleB and QILogB functions of the nuts.Float128s unit.
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ScaleB & ILogB
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Compiler directives
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NUTS_DEBUG : defined
NUTS_THREAD_SAFE : not defined
NUTS_ASM_CODE : not defined
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Context
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Masks = [feInexact,feUnderflow]
Flags = []
Rounding mode = rmTiesToEven
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Q (min subnormal), R := Q >> ILogB(Q)
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Q = 6.47517511943802511092443895822764655e-4966
Q = $0.0000000000000000000000000001p-16382
R = 1.0
R = $1.0
Check (R = 1) : OK
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Q (max subnormal), R := Q >> ILogB(Q)
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Q = 3.36210314311209350626267781732175196e-4932
Q = $0.FFFFFFFFFFFFFFFFFFFFFFFFFFFFp-16382
R = 1.99999999999999999999999999999999961
R = $1.FFFFFFFFFFFFFFFFFFFFFFFFFFFE
Check (R = NextDown(NextDown(2.0))) : OK
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Q (min normal), R := Q >> ILogB(Q)
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Q = 3.3621031431120935062626778173217526e-4932
Q = $1.0p-16382
R = 1.0
R = $1.0
Check (R = 1) : OK
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Q (random in 0..2**50, R := Q >> ILogB(Q)
-----------------------------------------
Q = 8.57092053662220888828277588859808781e+7
Q = $1.46F46557702EC5B4C56F0AEC424Ep+26
R = 1.27716668495866788749140141734452364
R = $1.46F46557702EC5B4C56F0AEC424E
Check (1 <= R < 2) : OK
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Q (max normal), R := Q >> ILogB(Q)
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Q = 1.18973149535723176508575932662800702e+4932
Q = $1.FFFFFFFFFFFFFFFFFFFFFFFFFFFFp+16383
R = 1.99999999999999999999999999999999981
R = $1.FFFFFFFFFFFFFFFFFFFFFFFFFFFF
Check (R = NextDown(2.0)) : OK
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