62 lines
2.4 KiB
Plaintext
62 lines
2.4 KiB
Plaintext
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This directory contains source for several test programs:
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dt is for conversion to/from double; it permits input of pairs of
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32-bit hex integers as #hhhhhhhh hhhhhhhh (i.e., the initial '#'
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indicates hex input). No initial # ==> decimal input.
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After the input number is an optional : mode ndigits
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(colon, and decimal integers for parameters "mode" and "ndigits"
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to gdtoa).
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Qtest, ddtest, dtest, ftest, xLtest and xtest are for conversion to/from
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f IEEE single precision
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d IEEE double precision
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xL IEEE extended precision, as on Motorola 680x0 chips
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x IEEE extended precision, as on Intel 80x87 chips or
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software emulation of Motorola 680x0 chips
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Q quad precision, as on Sun Sparc chips
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dd double double, pairs of IEEE double numbers
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whose sum is the desired value
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They're all similar, except for the precision. They test both
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directed roundings and interval input (the strtoI* routines).
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Lines that begin with "r" specify or interrogate the desired rounding
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direction:
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0 = toward 0
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1 = nearest (default)
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2 = toward +Infinity
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3 = toward -Infinity
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These are the FPI_Round_* values in gdota.h. The "r" value is sticky:
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it stays in effect til changed. To change the value, give a line that
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starts with r followed by 0, 1, 2, or 3. To check the value, give "r"
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by itself.
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Lines that begin with n followed by a number specify the ndig
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argument for subsequent calls to the relevant g_*fmt routine.
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Lines that start with # followed by the appropriate number of
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hexadecimal strings (see the comments) give the big-endian
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internal representation of the desired number.
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When routines Qtest, xLtest, and xtest are used on machines whose
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long double is of type "quad" (for Qtest) or "extended" (for x*test),
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they try to print with %Lg as another way to show binary values.
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Program ddtest also accepts (white-space separated) pairs of decimal
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input numbers; it converts both with strtod and feeds the result
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to g_ddfmt.
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Program dItest exercises strtodI and strtoId.
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Programs dItestsi and ddtestsi are for testing the sudden-underflow
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logic (on double and double-double conversions).
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Program strtodt tests strtod on some hard cases (in file testnos3)
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posted by Fred Tydeman to comp.arch.arithmetic on 26 Feb. 1996.
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These are simple test programs, not meant for exhaustive testing,
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but for manually testing "interesting" cases. Paxson's testbase
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is good for more exhaustive testing, in part with random inputs.
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