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Fix lib/msun/tests/csqrt_test on platforms with 128-bit long double

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If long double has more than 64 mantissa bits, using uint64_t to hold the
mantissa bits will truncate the value and result in test failures. To fix
this problem use __uint128_t since all platforms that have
__LDBL_MANT_DIG__ > 64 also have compiler support for 128-bit integers.

Reviewed By:	rlibby
Differential Revision: https://reviews.freebsd.org/D29076
This commit is contained in:
Alex Richardson 2021-03-22 16:54:02 +00:00
parent 71ba16a0a0
commit ce88eb476b
1 changed files with 17 additions and 9 deletions
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26
lib/msun/tests/csqrt_test.c
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@ -257,17 +257,24 @@ test_precision(int maxexp, int mantdig)
{
long double b, x;
long double complex result;
uint64_t mantbits, sq_mantbits;
#if LDBL_MANT_DIG <= 64
typedef uint64_t ldbl_mant_type;
#elif LDBL_MANT_DIG <= 128
typedef __uint128_t ldbl_mant_type;
#else
#error "Unsupported long double format"
#endif
ldbl_mant_type mantbits, sq_mantbits;
int exp, i;
ATF_CHECK(maxexp > 0 && maxexp % 2 == 0);
ATF_CHECK(mantdig <= 64);
ATF_REQUIRE(maxexp > 0 && maxexp % 2 == 0);
ATF_REQUIRE(mantdig <= LDBL_MANT_DIG);
mantdig = rounddown(mantdig, 2);
for (exp = 0; exp <= maxexp; exp += 2) {
mantbits = ((uint64_t)1 << (mantdig / 2 )) - 1;
for (i = 0;
i < 100 && mantbits > ((uint64_t)1 << (mantdig / 2 - 1));
mantbits = ((ldbl_mant_type)1 << (mantdig / 2)) - 1;
for (i = 0; i < 100 &&
mantbits > ((ldbl_mant_type)1 << (mantdig / 2 - 1));
i++, mantbits--) {
sq_mantbits = mantbits * mantbits;
/*
@ -283,10 +290,10 @@ test_precision(int maxexp, int mantdig)
b = ldexpl((long double)sq_mantbits,
exp - 1 - mantdig);
x = ldexpl(mantbits, (exp - 2 - mantdig) / 2);
ATF_CHECK_EQ(b, x * x * 2);
CHECK_FPEQUAL(b, x * x * 2);
result = t_csqrt(CMPLXL(0, b));
ATF_CHECK_EQ(x, creall(result));
ATF_CHECK_EQ(x, cimagl(result));
CHECK_FPEQUAL(x, creall(result));
CHECK_FPEQUAL(x, cimagl(result));
}
}
}
@ -345,6 +352,7 @@ ATF_TC_BODY(csqrtl, tc)
test_overflow(LDBL_MAX_EXP);
/* i386 is configured to use 53-bit rounding precision for long double. */
test_precision(LDBL_MAX_EXP,
#ifndef __i386__
LDBL_MANT_DIG