8aa4955581
XXX: could consolidate some of this into a common header, but i'll
leave that clean up for another time.
53 lines
931 B
C
53 lines
931 B
C
/* $NetBSD: t_round.c,v 1.2 2011/07/04 22:33:29 mrg Exp $ */
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#include <atf-c.h>
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#include <math.h>
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/*
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* This tests for a bug in the initial implementation where
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* precision was lost in an internal substraction, leading to
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* rounding into the wrong direction.
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*/
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/* 0.5 - EPSILON */
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#define VAL 0x0.7ffffffffffffcp0
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#define VALF 0x0.7fffff8p0
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#ifdef __vax__
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#define SMALL_NUM 1.0e-38
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#else
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#define SMALL_NUM 1.0e-40
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#endif
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ATF_TC(round_dir);
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ATF_TC_HEAD(round_dir, tc)
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{
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atf_tc_set_md_var(tc, "descr","Check for rounding in wrong direction");
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}
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ATF_TC_BODY(round_dir, tc)
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{
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double a = VAL, b, c;
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float af = VALF, bf, cf;
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b = round(a);
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bf = roundf(af);
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ATF_REQUIRE(fabs(b) < SMALL_NUM);
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ATF_REQUIRE(fabsf(bf) < SMALL_NUM);
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c = round(-a);
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cf = roundf(-af);
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ATF_REQUIRE(fabs(c) < SMALL_NUM);
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ATF_REQUIRE(fabsf(cf) < SMALL_NUM);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, round_dir);
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return atf_no_error();
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}
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