Attached testcases fail on x86_64 (with cmpxchg16b) or i386 (with cmpxchg8b),
in both cases the problem is that reading the original value using FPU and
storing it into a temporary doesn't mean bitwise identical copy (in the first
case because long double is said to be a 16 byte type, even when the copy
through FPU actually copies just 80 bits, and in the latter case because the
copy turns the signalling NaN into a corresponding quiet NaN). This means both
testcases hang.
Will work on a fix.
--
Summary: #pragma omp atomic issues with floating point types
Product: gcc
Version: 4.3.1
Status: UNCONFIRMED
Keywords: openmp
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jakub at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36106
