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According to https://gcc.gnu.org/pipermail/gcc/2020-November/234344.html, GCC is allowed to perform optimizations that remove floating point traps, since they do not affect the modeled control flow. This interferes with two signaling comparison tests, where (a <= b && a >= b) is turned into (a <= b && a == b) by test_for_singularity, into ((a <= b) & (a == b)) by vectorizer and then into (a == b) eliminate_redundant_comparison. Fix by making traps affect the control flow by turning them into exceptions. gcc/testsuite/ChangeLog: 2020-12-03 Ilya Leoshkevich <iii@linux.ibm.com> * gcc.target/s390/zvector/autovec-double-signaling-eq.c: Build with exceptions. * gcc.target/s390/zvector/autovec-float-signaling-eq.c: Likewise.
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