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| author | Joseph Myers <joseph@codesourcery.com> | 2015-10-01 15:24:54 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-10-01 15:24:54 +0000 |
| commit | e27fcd027cbdc2f13bf440177c0434eb9ec3dd28 (patch) | |
| tree | 8b653db2c0bbc46e46589ed9c2853baf23659dff /math | |
| parent | 7cda516f5f23772fd37ca3a5e018fca5bf388435 (diff) | |
Use type-specific precision when printing results in libm-test.inc.
When libm-test.inc prints the results of failing tests, the output can
be unhelpful for ldbl-128 and ldbl-128ibm because the precision used
is insufficient to distinguish values of those types, resulting in
reported values that look identical but differ by a large number of
ulps.
This patch changes it to use a precision appropriate for the type, for
both decimal and hex output (so output for float is more compact,
output for ldbl-128 and ldbl-128ibm is substantially wider). The
natural precision to use for decimal is given by the C11 <float.h>
macros such as FLT_DECIMAL_DIG. GCC's <float.h> only defines those in
C11 mode, so this patch uses the predefines such as
__FLT_DECIMAL_DIG__ (added in GCC 4.6) instead; if we move to building
with -std=gnu11 (or -std=gnu1x if we can't get rid of 4.6 support).
Tested for powerpc and mips64.
* math/libm-test.inc (TYPE_DECIMAL_DIG): New macro.
(TYPE_HEX_DIG): Likewise.
(print_float): Use TYPE_DECIMAL_DIG - 1 and TYPE_HEX_DIG - 1 as
precisions when printing floating-point numbers.
(check_float_internal): Likewise.
Diffstat (limited to 'math')
| -rw-r--r-- | math/libm-test.inc | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/math/libm-test.inc b/math/libm-test.inc index 8615957600..f627296d66 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -338,6 +338,18 @@ static FLOAT max_valid_error; (LDBL_MANT_DIG-1), (DBL_MANT_DIG-1), (FLT_MANT_DIG-1)) #define MIN_EXP CHOOSE ((LDBL_MIN_EXP-1), (DBL_MIN_EXP-1), (FLT_MIN_EXP-1), \ (LDBL_MIN_EXP-1), (DBL_MIN_EXP-1), (FLT_MIN_EXP-1)) +/* Sufficient numbers of digits to represent any floating-point value + unambiguously (for any choice of the number of bits in the first + hex digit, in the case of TYPE_HEX_DIG). When used with printf + formats where the precision counts only digits after the point, 1 + is subtracted from these values. */ +#define TYPE_DECIMAL_DIG CHOOSE (__DECIMAL_DIG__, \ + __DBL_DECIMAL_DIG__, \ + __FLT_DECIMAL_DIG__, \ + __DECIMAL_DIG__, \ + __DBL_DECIMAL_DIG__, \ + __FLT_DECIMAL_DIG__) +#define TYPE_HEX_DIG ((MANT_DIG + 7) / 4) /* Compare KEY (a string, with the name of a function) with ULP (a pointer to a struct ulp_data structure), returning a value less @@ -419,7 +431,8 @@ print_float (FLOAT f) else if (isnan (f)) printf ("qNaN\n"); else - printf ("% .20" PRINTF_EXPR " % .20" PRINTF_XEXPR "\n", f, f); + printf ("% .*" PRINTF_EXPR " % .*" PRINTF_XEXPR "\n", + TYPE_DECIMAL_DIG - 1, f, TYPE_HEX_DIG - 1, f); } /* Should the message print to screen? This depends on the verbose flag, @@ -837,8 +850,8 @@ check_float_internal (const char *test_name, FLOAT computed, FLOAT expected, print_float (expected); if (print_diff) { - printf (" difference: % .20" PRINTF_EXPR " % .20" PRINTF_XEXPR - "\n", diff, diff); + printf (" difference: % .*" PRINTF_EXPR " % .*" PRINTF_XEXPR + "\n", TYPE_DECIMAL_DIG - 1, diff, TYPE_HEX_DIG - 1, diff); printf (" ulp : % .4" PRINTF_NEXPR "\n", ulps); printf (" max.ulp : % .4" PRINTF_NEXPR "\n", max_ulp); } |