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authorJoseph Myers <joseph@codesourcery.com>2020-07-06 16:18:02 +0000
committerJoseph Myers <joseph@codesourcery.com>2020-07-06 16:18:02 +0000
commit6c010c5dde1735f93cc3a6597cdcc2b482af85f8 (patch)
tree5f0a95e22d85c21352efccfde78f2f515cdba433 /sysdeps/ieee754/ldbl-128ibm
parent28c13ae5bbc81aa2ae67890ce53e65257d4703a4 (diff)
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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-128ibm')
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/s_getpayloadl.c3
1 files changed, 3 insertions, 0 deletions
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;