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ROUND_NINF8arch/alpha/math-emu/fp-emul.h#define ROUND_NINF  0x01  /* round towards negative infinity */
ROUND_NINF16arch/alpha/math-emu/ieee-math.h#define ROUND_NINF   (FPCR_DYN_MINUS   >> FPCR_DYN_SHIFT)