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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 /manual/arith.texi | |
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.
Diffstat (limited to 'manual/arith.texi')
-rw-r--r-- | manual/arith.texi | 7 |
1 files changed, 4 insertions, 3 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}) |