FPCSR_mskUDF      939 arch/nds32/include/asm/bitfield.h #define FPCSR_mskALL		(FPCSR_mskIVO | FPCSR_mskDBZ | FPCSR_mskOVF | FPCSR_mskUDF | FPCSR_mskIEX)
FPCSR_mskUDF       69 arch/nds32/include/asm/sfp-machine.h #define FP_EX_UNDERFLOW		FPCSR_mskUDF