On an operand that is in an unsupported format (Pseudo-NaN, Pseudo-Infinity, Unnormal), FEX's F80Fallback layer either fails to detect the invalid condition or never returns indefinite value (QNaN or packed-BCD).
Affects (at least):
F2XM1, FYL2X, FYL2XP1, FPATAN , FPTAN, FSIN, FCOS, FSINCOS, FBSTP.
FADD/FSUB/FMUL and so on seem to be unaffected as they use Berkeley SoftFloat primitives.
On an operand that is in an unsupported format (Pseudo-NaN, Pseudo-Infinity, Unnormal), FEX's F80Fallback layer either fails to detect the invalid condition or never returns indefinite value (QNaN or packed-BCD).
Affects (at least):
F2XM1,FYL2X,FYL2XP1,FPATAN,FPTAN,FSIN,FCOS,FSINCOS,FBSTP.FADD/FSUB/FMUL and so on seem to be unaffected as they use Berkeley SoftFloat primitives.