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| author | Joseph Myers <joseph@codesourcery.com> | 2020-07-06 16:18:02 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2020-07-06 16:18:02 +0000 |
| commit | 6c010c5dde1735f93cc3a6597cdcc2b482af85f8 (patch) | |
| tree | 5f0a95e22d85c21352efccfde78f2f515cdba433 /sysdeps/ieee754/ldbl-128 | |
| parent | 28c13ae5bbc81aa2ae67890ce53e65257d4703a4 (diff) | |
| download | glibc-6c010c5dde1735f93cc3a6597cdcc2b482af85f8.tar.gz glibc-6c010c5dde1735f93cc3a6597cdcc2b482af85f8.tar.xz glibc-6c010c5dde1735f93cc3a6597cdcc2b482af85f8.zip | |
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.
Diffstat (limited to 'sysdeps/ieee754/ldbl-128')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_getpayloadl.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_getpayloadl.c b/sysdeps/ieee754/ldbl-128/s_getpayloadl.c index db55a00f66..1fbe704608 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. */ |