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author | Joseph Myers <joseph@codesourcery.com> | 2020-07-06 16:18:02 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2020-07-06 16:18:02 +0000 |
commit | 6c010c5dde1735f93cc3a6597cdcc2b482af85f8 (patch) | |
tree | 5f0a95e22d85c21352efccfde78f2f515cdba433 | |
parent | 28c13ae5bbc81aa2ae67890ce53e65257d4703a4 (diff) | |
download | glibc-6c010c5dde1735f93cc3a6597cdcc2b482af85f8.zip glibc-6c010c5dde1735f93cc3a6597cdcc2b482af85f8.tar.gz glibc-6c010c5dde1735f93cc3a6597cdcc2b482af85f8.tar.bz2 |
Use C2x return value from getpayload of non-NaN (bug 26073).
In TS 18661-1, getpayload had an unspecified return value for a
non-NaN argument, while C2x requires the return value -1 in that case.
This patch implements the return value of -1. I don't think this is
worth having a new symbol version that's an alias of the old one,
although occasionally we do that in such cases where the new function
semantics are a refinement of the old ones (to avoid programs relying
on the new semantics running on older glibc versions but not behaving
as intended).
Tested for x86_64 and x86; also ran math/ tests for aarch64 and
powerpc.
-rw-r--r-- | manual/arith.texi | 7 | ||||
-rw-r--r-- | math/libm-test-getpayload.inc | 22 | ||||
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_getpayload.c | 3 | ||||
-rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c | 3 | ||||
-rw-r--r-- | sysdeps/ieee754/flt-32/s_getpayloadf.c | 3 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-128/s_getpayloadl.c | 3 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c | 3 | ||||
-rw-r--r-- | sysdeps/ieee754/ldbl-96/s_getpayloadl.c | 3 |
8 files changed, 33 insertions, 14 deletions
diff --git a/manual/arith.texi b/manual/arith.texi index 89c2c06..75eaf67 100644 --- a/manual/arith.texi +++ b/manual/arith.texi @@ -1895,9 +1895,10 @@ propagated from NaN inputs to the result of a floating-point operation. These functions, defined by TS 18661-1:2014 and TS 18661-3:2015, return the payload of the NaN pointed to by @var{x} (returned as a positive integer, or positive zero, represented as a -floating-point number); if @var{x} is not a NaN, they return an -unspecified value. They raise no floating-point exceptions even for -signaling NaNs. +floating-point number); if @var{x} is not a NaN, they return +@minus{}1. They raise no floating-point exceptions even for signaling +NaNs. (The return value of @minus{}1 for an argument that is not a +NaN is specified in C2x; the value was unspecified in TS 18661.) @end deftypefun @deftypefun int setpayload (double *@var{x}, double @var{payload}) diff --git a/math/libm-test-getpayload.inc b/math/libm-test-getpayload.inc index bd66047..72e3c19 100644 --- a/math/libm-test-getpayload.inc +++ b/math/libm-test-getpayload.inc @@ -20,17 +20,17 @@ static const struct test_f_f_data getpayload_test_data[] = { - TEST_fp_f (getpayload, plus_infty, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, minus_infty, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, plus_zero, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, minus_zero, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, 1000, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, max_value, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, -max_value, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, min_value, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, -min_value, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, min_subnorm_value, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), - TEST_fp_f (getpayload, -min_subnorm_value, IGNORE, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, plus_infty, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, minus_infty, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, plus_zero, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, minus_zero, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, 1000, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, max_value, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, -max_value, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, min_value, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, -min_value, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, min_subnorm_value, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), + TEST_fp_f (getpayload, -min_subnorm_value, -1.0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN TEST_fp_f (getpayload, snan_value_pl ("0x0"), plus_zero, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), TEST_fp_f (getpayload, -snan_value_pl ("0x0"), plus_zero, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED), diff --git a/sysdeps/ieee754/dbl-64/s_getpayload.c b/sysdeps/ieee754/dbl-64/s_getpayload.c index 3ab89dd..5a055be 100644 --- a/sysdeps/ieee754/dbl-64/s_getpayload.c +++ b/sysdeps/ieee754/dbl-64/s_getpayload.c @@ -27,6 +27,9 @@ __getpayload (const double *x) { uint32_t hx, lx; EXTRACT_WORDS (hx, lx, *x); + if ((hx & 0x7ff00000) != 0x7ff00000 + || ((hx & 0xfffff) | lx) == 0) + return -1; hx &= 0x7ffff; uint64_t ix = ((uint64_t) hx << 32) | lx; if (FIX_INT_FP_CONVERT_ZERO && ix == 0) diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c index 2c887b9..eba96d0 100644 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_getpayload.c @@ -26,6 +26,9 @@ __getpayload (const double *x) { uint64_t ix; EXTRACT_WORDS64 (ix, *x); + if ((ix & 0x7ff0000000000000ULL) != 0x7ff0000000000000ULL + || (ix & 0xfffffffffffffULL) == 0) + return -1; ix &= 0x7ffffffffffffULL; return (double) ix; } diff --git a/sysdeps/ieee754/flt-32/s_getpayloadf.c b/sysdeps/ieee754/flt-32/s_getpayloadf.c index e1d2247..1baad48 100644 --- a/sysdeps/ieee754/flt-32/s_getpayloadf.c +++ b/sysdeps/ieee754/flt-32/s_getpayloadf.c @@ -27,6 +27,9 @@ __getpayloadf (const float *x) { uint32_t ix; GET_FLOAT_WORD (ix, *x); + if ((ix & 0x7f800000) != 0x7f800000 + || (ix & 0x7fffff) == 0) + return -1; ix &= 0x3fffff; if (FIX_INT_FP_CONVERT_ZERO && ix == 0) return 0.0f; diff --git a/sysdeps/ieee754/ldbl-128/s_getpayloadl.c b/sysdeps/ieee754/ldbl-128/s_getpayloadl.c index db55a00..1fbe704 100644 --- a/sysdeps/ieee754/ldbl-128/s_getpayloadl.c +++ b/sysdeps/ieee754/ldbl-128/s_getpayloadl.c @@ -26,6 +26,9 @@ __getpayloadl (const _Float128 *x) { uint64_t hx, lx; GET_LDOUBLE_WORDS64 (hx, lx, *x); + if ((hx & 0x7fff000000000000ULL) != 0x7fff000000000000ULL + || ((hx & 0xffffffffffffULL) | lx) == 0) + return -1; hx &= 0x7fffffffffffULL; /* Construct the representation of the return value directly, since 128-bit integers may not be available. */ diff --git a/sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c b/sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c index 3b5a1a8..abbd694 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c @@ -27,6 +27,9 @@ __getpayloadl (const long double *x) double xhi = ldbl_high (*x); uint64_t ix; EXTRACT_WORDS64 (ix, xhi); + if ((ix & 0x7ff0000000000000ULL) != 0x7ff0000000000000ULL + || (ix & 0xfffffffffffffULL) == 0) + return -1; ix &= 0x7ffffffffffffULL; if (FIX_INT_FP_CONVERT_ZERO && ix == 0) return 0.0L; diff --git a/sysdeps/ieee754/ldbl-96/s_getpayloadl.c b/sysdeps/ieee754/ldbl-96/s_getpayloadl.c index 8f09cb7..761bd69 100644 --- a/sysdeps/ieee754/ldbl-96/s_getpayloadl.c +++ b/sysdeps/ieee754/ldbl-96/s_getpayloadl.c @@ -27,6 +27,9 @@ __getpayloadl (const long double *x) uint16_t se __attribute__ ((unused)); uint32_t hx, lx; GET_LDOUBLE_WORDS (se, hx, lx, *x); + if ((se & 0x7fff) != 0x7fff + || ((hx & 0x7fffffff) | lx) == 0) + return -1; hx &= 0x3fffffff; uint64_t ix = ((uint64_t) hx << 32) | lx; return (long double) ix; |