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Make tst-strtod-underflow type-generic
The test tst-strtod-underflow covers various edge cases close to the
underflow threshold for strtod (especially cases where underflow on
architectures with after-rounding tininess detection depends on the
rounding mode). Make it use the type-generic machinery, with
corresponding test inputs for each supported floating-point format, so
that other functions in the strtod family are tested for underflow
edge cases as well.
Tested for x86_64.
(cherry picked from commit 94ca2c0894)
This commit is contained in:
Joseph Myers
Arjun Shankar
parent
5c06c6e0b5
commit
85e5850f2f
@ -17,6 +17,10 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Defining _LIBC_TEST ensures long double math functions are
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declared in the headers. */
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#define _LIBC_TEST 1
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#define __STDC_WANT_IEC_60559_TYPES_EXT__
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#include <errno.h>
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#include <fenv.h>
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#include <float.h>
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@ -25,6 +29,60 @@
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#include <stdlib.h>
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#include <tininess.h>
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#include "tst-strtod.h"
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/* Logic for selecting between tests for different formats is as in
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tst-strtod-skeleton.c, but here it is selecting string inputs with
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different underflow properties, rather than generated test
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data. */
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#define _CONCAT(a, b) a ## b
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#define CONCAT(a, b) _CONCAT (a, b)
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#define MEMBER(FSUF, FTYPE, FTOSTR, LSUF, CSUF) \
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const char *s_ ## FSUF;
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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# define CHOOSE_ld(f,d,...) d
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#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && LDBL_MIN_EXP == -16381
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# define CHOOSE_ld(f,d,ld64i,...) ld64i
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#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 && LDBL_MIN_EXP == -16382
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# define CHOOSE_ld(f,d,ld64i,ld64m,...) ld64m
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#elif LDBL_MANT_DIG == 106 && LDBL_MAX_EXP == 1024
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# define CHOOSE_ld(f,d,ld64i,ld64m,ld106,...) ld106
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#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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# define CHOOSE_ld(f,d,ld64i,ld64m,ld106,ld113,...) ld113
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#else
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# error "unknown long double format"
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#endif
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#define CHOOSE_f(f,...) f
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#define CHOOSE_f32(f,...) f
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#define CHOOSE_d(f,d,...) d
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#define CHOOSE_f64(f,d,...) d
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#define CHOOSE_f32x(f,d,...) d
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#define CHOOSE_f128(f,d,ld64i,ld64m,ld106,ld113,...) ld113
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#if __HAVE_FLOAT64X
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# if FLT64X_MANT_DIG == 113 && FLT64X_MAX_EXP == 16384
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# define CHOOSE_f64x(f,d,ld64i,ld64m,ld106,ld113,...) ld113
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# elif (FLT64X_MANT_DIG == 64 \
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&& FLT64X_MAX_EXP == 16384 \
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&& FLT64X_MIN_EXP == -16381)
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# define CHOOSE_f64x(f,d,ld64i,...) ld64i
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# else
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# error "unknown _Float64x format"
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# endif
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#endif
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#define _XNTRY(FSUF, FTYPE, FTOSTR, LSUF, CSUF, ...) \
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CHOOSE_ ## FSUF (__VA_ARGS__),
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#define XNTRY(...) \
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GEN_TEST_STRTOD_FOREACH (_XNTRY, __VA_ARGS__)
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#define TEST(f, d, ld64i, ld64m, ld106, ld113, u) \
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{ XNTRY(f, d, ld64i, ld64m, ld106, ld113) u }
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enum underflow_case
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{
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/* Result is exact or outside the subnormal range. */
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@ -55,38 +113,194 @@ enum underflow_case
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struct test
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{
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const char *s;
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GEN_TEST_STRTOD_FOREACH (MEMBER)
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enum underflow_case c;
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};
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static const struct test tests[] =
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{
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{ "0x1p-1022", UNDERFLOW_NONE },
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{ "-0x1p-1022", UNDERFLOW_NONE },
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{ "0x0p-10000000000000000000000000", UNDERFLOW_NONE },
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{ "-0x0p-10000000000000000000000000", UNDERFLOW_NONE },
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{ "0x1p-10000000000000000000000000", UNDERFLOW_ALWAYS },
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{ "-0x1p-10000000000000000000000000", UNDERFLOW_ALWAYS },
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{ "0x1.000000000000000000001p-1022", UNDERFLOW_NONE },
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{ "-0x1.000000000000000000001p-1022", UNDERFLOW_NONE },
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{ "0x1p-1075", UNDERFLOW_ALWAYS },
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{ "-0x1p-1075", UNDERFLOW_ALWAYS },
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{ "0x1p-1023", UNDERFLOW_NONE },
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{ "-0x1p-1023", UNDERFLOW_NONE },
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{ "0x1p-1074", UNDERFLOW_NONE },
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{ "-0x1p-1074", UNDERFLOW_NONE },
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{ "0x1.ffffffffffffep-1023", UNDERFLOW_NONE },
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{ "-0x1.ffffffffffffep-1023", UNDERFLOW_NONE },
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{ "0x1.fffffffffffffp-1023", UNDERFLOW_ALWAYS },
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{ "-0x1.fffffffffffffp-1023", UNDERFLOW_ALWAYS },
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{ "0x1.fffffffffffff0001p-1023", UNDERFLOW_EXCEPT_UPWARD },
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{ "-0x1.fffffffffffff0001p-1023", UNDERFLOW_EXCEPT_DOWNWARD },
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{ "0x1.fffffffffffff7fffp-1023", UNDERFLOW_EXCEPT_UPWARD },
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{ "-0x1.fffffffffffff7fffp-1023", UNDERFLOW_EXCEPT_DOWNWARD },
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{ "0x1.fffffffffffff8p-1023", UNDERFLOW_ONLY_DOWNWARD_ZERO },
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{ "-0x1.fffffffffffff8p-1023", UNDERFLOW_ONLY_UPWARD_ZERO },
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{ "0x1.fffffffffffffffffp-1023", UNDERFLOW_ONLY_DOWNWARD_ZERO },
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{ "-0x1.fffffffffffffffffp-1023", UNDERFLOW_ONLY_UPWARD_ZERO },
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TEST ("0x1p-126",
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"0x1p-1022",
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"0x1p-16382",
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"0x1p-16383",
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"0x1p-969",
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"0x1p-16382",
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UNDERFLOW_NONE),
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TEST ("-0x1p-126",
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"-0x1p-1022",
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"-0x1p-16382",
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"-0x1p-16383",
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"-0x1p-969",
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"-0x1p-16382",
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UNDERFLOW_NONE),
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TEST ("0x0p-10000000000000000000000000",
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"0x0p-10000000000000000000000000",
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"0x0p-10000000000000000000000000",
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"0x0p-10000000000000000000000000",
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"0x0p-10000000000000000000000000",
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"0x0p-10000000000000000000000000",
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UNDERFLOW_NONE),
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TEST ("-0x0p-10000000000000000000000000",
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"-0x0p-10000000000000000000000000",
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"-0x0p-10000000000000000000000000",
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"-0x0p-10000000000000000000000000",
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"-0x0p-10000000000000000000000000",
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"-0x0p-10000000000000000000000000",
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UNDERFLOW_NONE),
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TEST ("0x1p-10000000000000000000000000",
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"0x1p-10000000000000000000000000",
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"0x1p-10000000000000000000000000",
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"0x1p-10000000000000000000000000",
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"0x1p-10000000000000000000000000",
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"0x1p-10000000000000000000000000",
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UNDERFLOW_ALWAYS),
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TEST ("-0x1p-10000000000000000000000000",
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"-0x1p-10000000000000000000000000",
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"-0x1p-10000000000000000000000000",
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"-0x1p-10000000000000000000000000",
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"-0x1p-10000000000000000000000000",
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"-0x1p-10000000000000000000000000",
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UNDERFLOW_ALWAYS),
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TEST ("0x1.000000000000000000001p-126",
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"0x1.000000000000000000001p-1022",
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"0x1.000000000000000000001p-16382",
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"0x1.000000000000000000001p-16383",
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"0x1.000000000000000000001p-969",
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"0x1.00000000000000000000000000000000000000001p-16382",
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UNDERFLOW_NONE),
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TEST ("-0x1.000000000000000000001p-126",
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"-0x1.000000000000000000001p-1022",
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"-0x1.000000000000000000001p-16382",
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"-0x1.000000000000000000001p-16383",
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"-0x1.000000000000000000001p-969",
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"-0x1.00000000000000000000000000000000000000001p-16382",
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UNDERFLOW_NONE),
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TEST ("0x1p-150",
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"0x1p-1075",
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"0x1p-16446",
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"0x1p-16447",
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"0x1p-1075",
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"0x1p-16495",
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UNDERFLOW_ALWAYS),
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TEST ("-0x1p-150",
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"-0x1p-1075",
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"-0x1p-16446",
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"-0x1p-16447",
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"-0x1p-1075",
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"-0x1p-16495",
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UNDERFLOW_ALWAYS),
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TEST ("0x1p-127",
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"0x1p-1023",
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"0x1p-16383",
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"0x1p-16384",
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"0x1p-970",
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"0x1p-16383",
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UNDERFLOW_NONE),
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TEST ("-0x1p-127",
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"-0x1p-1023",
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"-0x1p-16383",
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"-0x1p-16384",
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"-0x1p-970",
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"-0x1p-16383",
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UNDERFLOW_NONE),
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TEST ("0x1p-149",
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"0x1p-1074",
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"0x1p-16445",
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"0x1p-16446",
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"0x1p-1074",
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"0x1p-16494",
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UNDERFLOW_NONE),
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TEST ("-0x1p-149",
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"-0x1p-1074",
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"-0x1p-16445",
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"-0x1p-16446",
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"-0x1p-1074",
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"-0x1p-16494",
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UNDERFLOW_NONE),
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TEST ("0x1.fffffcp-127",
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"0x1.ffffffffffffep-1023",
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"0x1.fffffffffffffffcp-16383",
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"0x1.fffffffffffffffcp-16384",
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"0x1.ffffffffffffffffffffffffffp-970",
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"0x1.fffffffffffffffffffffffffffep-16383",
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UNDERFLOW_NONE),
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TEST ("-0x1.fffffcp-127",
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"-0x1.ffffffffffffep-1023",
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"-0x1.fffffffffffffffcp-16383",
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"-0x1.fffffffffffffffcp-16384",
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"-0x1.ffffffffffffffffffffffffffp-970",
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"-0x1.fffffffffffffffffffffffffffep-16383",
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UNDERFLOW_NONE),
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TEST ("0x1.fffffep-127",
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"0x1.fffffffffffffp-1023",
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"0x1.fffffffffffffffep-16383",
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"0x1.fffffffffffffffep-16384",
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"0x1.ffffffffffffffffffffffffff8p-970",
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"0x1.ffffffffffffffffffffffffffffp-16383",
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UNDERFLOW_ALWAYS),
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TEST ("-0x1.fffffep-127",
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"-0x1.fffffffffffffp-1023",
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"-0x1.fffffffffffffffep-16383",
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"-0x1.fffffffffffffffep-16384",
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"-0x1.ffffffffffffffffffffffffff8p-970",
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"-0x1.ffffffffffffffffffffffffffffp-16383",
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UNDERFLOW_ALWAYS),
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TEST ("0x1.fffffe0001p-127",
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"0x1.fffffffffffff0001p-1023",
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"0x1.fffffffffffffffe0001p-16383",
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"0x1.fffffffffffffffe0001p-16384",
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"0x1.ffffffffffffffffffffffffff80001p-970",
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"0x1.ffffffffffffffffffffffffffff0001p-16383",
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UNDERFLOW_EXCEPT_UPWARD),
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TEST ("-0x1.fffffe0001p-127",
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"-0x1.fffffffffffff0001p-1023",
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"-0x1.fffffffffffffffe0001p-16383",
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"-0x1.fffffffffffffffe0001p-16384",
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"-0x1.ffffffffffffffffffffffffff80001p-970",
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"-0x1.ffffffffffffffffffffffffffff0001p-16383",
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UNDERFLOW_EXCEPT_DOWNWARD),
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TEST ("0x1.fffffeffffp-127",
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"0x1.fffffffffffff7fffp-1023",
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"0x1.fffffffffffffffeffffp-16383",
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"0x1.fffffffffffffffeffffp-16384",
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"0x1.ffffffffffffffffffffffffffbffffp-970",
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"0x1.ffffffffffffffffffffffffffff7fffp-16383",
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UNDERFLOW_EXCEPT_UPWARD),
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TEST ("-0x1.fffffeffffp-127",
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"-0x1.fffffffffffff7fffp-1023",
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"-0x1.fffffffffffffffeffffp-16383",
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"-0x1.fffffffffffffffeffffp-16384",
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"-0x1.ffffffffffffffffffffffffffbffffp-970",
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"-0x1.ffffffffffffffffffffffffffff7fffp-16383",
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UNDERFLOW_EXCEPT_DOWNWARD),
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TEST ("0x1.ffffffp-127",
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"0x1.fffffffffffff8p-1023",
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"0x1.ffffffffffffffffp-16383",
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"0x1.ffffffffffffffffp-16384",
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"0x1.ffffffffffffffffffffffffffcp-970",
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"0x1.ffffffffffffffffffffffffffff8p-16383",
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UNDERFLOW_ONLY_DOWNWARD_ZERO),
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TEST ("-0x1.ffffffp-127",
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"-0x1.fffffffffffff8p-1023",
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"-0x1.ffffffffffffffffp-16383",
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"-0x1.ffffffffffffffffp-16384",
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"-0x1.ffffffffffffffffffffffffffcp-970",
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"-0x1.ffffffffffffffffffffffffffff8p-16383",
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UNDERFLOW_ONLY_UPWARD_ZERO),
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TEST ("0x1.ffffffffffp-127",
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"0x1.fffffffffffffffffp-1023",
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"0x1.ffffffffffffffffffffp-16383",
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"0x1.ffffffffffffffffffffp-16384",
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"0x1.ffffffffffffffffffffffffffffffp-970",
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"0x1.ffffffffffffffffffffffffffffffffp-16383",
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UNDERFLOW_ONLY_DOWNWARD_ZERO),
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TEST ("-0x1.ffffffffffp-127",
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"-0x1.fffffffffffffffffp-1023",
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"-0x1.ffffffffffffffffffffp-16383",
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"-0x1.ffffffffffffffffffffp-16384",
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"-0x1.ffffffffffffffffffffffffffffffp-970",
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"-0x1.ffffffffffffffffffffffffffffffffp-16383",
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UNDERFLOW_ONLY_UPWARD_ZERO),
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};
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/* Return whether to expect underflow from a particular testcase, in a
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@ -133,39 +347,62 @@ static bool support_underflow_exception = false;
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volatile double d = DBL_MIN;
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volatile double dd;
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static int
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test_in_one_mode (const char *s, enum underflow_case c, int rm,
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const char *mode_name)
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static bool
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test_got_fe_underflow (void)
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{
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int result = 0;
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feclearexcept (FE_ALL_EXCEPT);
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errno = 0;
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double d = strtod (s, NULL);
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int got_errno = errno;
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#ifdef FE_UNDERFLOW
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bool got_fe_underflow = fetestexcept (FE_UNDERFLOW) != 0;
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return fetestexcept (FE_UNDERFLOW) != 0;
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#else
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bool got_fe_underflow = false;
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return false;
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#endif
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printf ("strtod (%s) (%s) returned %a, errno = %d, %sunderflow exception\n",
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s, mode_name, d, got_errno, got_fe_underflow ? "" : "no ");
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bool this_expect_underflow = expect_underflow (c, rm);
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if (got_errno != 0 && got_errno != ERANGE)
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{
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puts ("FAIL: errno neither 0 nor ERANGE");
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result = 1;
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}
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else if (this_expect_underflow != (errno == ERANGE))
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{
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puts ("FAIL: underflow from errno differs from expectations");
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result = 1;
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}
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if (support_underflow_exception && got_fe_underflow != this_expect_underflow)
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{
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puts ("FAIL: underflow from exceptions differs from expectations");
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result = 1;
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}
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return result;
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}
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#define TEST_STRTOD(FSUF, FTYPE, FTOSTR, LSUF, CSUF) \
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static int \
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test_strto ## FSUF (int i, int rm, const char *mode_name) \
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{ \
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const char *s = tests[i].s_ ## FSUF; \
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enum underflow_case c = tests[i].c; \
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int result = 0; \
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feclearexcept (FE_ALL_EXCEPT); \
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errno = 0; \
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FTYPE d = strto ## FSUF (s, NULL); \
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int got_errno = errno; \
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bool got_fe_underflow = test_got_fe_underflow (); \
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char buf[FSTRLENMAX]; \
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FTOSTR (buf, sizeof (buf), "%a", d); \
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printf ("strto" #FSUF \
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" (%s) (%s) returned %s, errno = %d, " \
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"%sunderflow exception\n", \
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s, mode_name, buf, got_errno, \
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got_fe_underflow ? "" : "no "); \
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bool this_expect_underflow = expect_underflow (c, rm); \
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if (got_errno != 0 && got_errno != ERANGE) \
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{ \
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puts ("FAIL: errno neither 0 nor ERANGE"); \
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result = 1; \
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} \
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else if (this_expect_underflow != (errno == ERANGE)) \
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{ \
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puts ("FAIL: underflow from errno differs from expectations"); \
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result = 1; \
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} \
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if (support_underflow_exception \
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&& got_fe_underflow != this_expect_underflow) \
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{ \
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puts ("FAIL: underflow from exceptions " \
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"differs from expectations"); \
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result = 1; \
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} \
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return result; \
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}
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GEN_TEST_STRTOD_FOREACH (TEST_STRTOD)
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static int
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test_in_one_mode (size_t i, int rm, const char *mode_name)
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{
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return STRTOD_TEST_FOREACH (test_strto, i, rm, mode_name);
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}
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static int
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@ -191,12 +428,12 @@ do_test (void)
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#endif
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for (size_t i = 0; i < sizeof (tests) / sizeof (tests[0]); i++)
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{
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result |= test_in_one_mode (tests[i].s, tests[i].c, fe_tonearest,
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result |= test_in_one_mode (i, fe_tonearest,
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||||
"default rounding mode");
|
||||
#ifdef FE_DOWNWARD
|
||||
if (!fesetround (FE_DOWNWARD))
|
||||
{
|
||||
result |= test_in_one_mode (tests[i].s, tests[i].c, FE_DOWNWARD,
|
||||
result |= test_in_one_mode (i, FE_DOWNWARD,
|
||||
"FE_DOWNWARD");
|
||||
fesetround (save_round_mode);
|
||||
}
|
||||
@ -204,7 +441,7 @@ do_test (void)
|
||||
#ifdef FE_TOWARDZERO
|
||||
if (!fesetround (FE_TOWARDZERO))
|
||||
{
|
||||
result |= test_in_one_mode (tests[i].s, tests[i].c, FE_TOWARDZERO,
|
||||
result |= test_in_one_mode (i, FE_TOWARDZERO,
|
||||
"FE_TOWARDZERO");
|
||||
fesetround (save_round_mode);
|
||||
}
|
||||
@ -212,7 +449,7 @@ do_test (void)
|
||||
#ifdef FE_UPWARD
|
||||
if (!fesetround (FE_UPWARD))
|
||||
{
|
||||
result |= test_in_one_mode (tests[i].s, tests[i].c, FE_UPWARD,
|
||||
result |= test_in_one_mode (i, FE_UPWARD,
|
||||
"FE_UPWARD");
|
||||
fesetround (save_round_mode);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user