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37 #include <machine/asm.h>
39 #if defined(LIBC_SCCS)
42 #endif /* LIBC_SCCS */
44 #define DEXP_INF 0x7ff
50 * Return true if x is a NAN.
54 mfc1 v1, $f13 # get MSW of x
55 mfc1 t3, $f12 # get LSW of x
56 sll t1, v1, 1 # get x exponent
58 bne t1, DEXP_INF, 2f # is it a finite number?
59 sll t2, v1, 32 - 20 # get x fraction
60 bne t3, zero, 1f # is it a NAN?
62 beq t2, zero, 2f # its infinity
69 move v0, zero # x is NOT a NAN
76 * Return true if x is infinity.
80 mfc1 v1, $f13 # get MSW of x
81 mfc1 t3, $f12 # get LSW of x
82 sll t1, v1, 1 # get x exponent
84 bne t1, DEXP_INF, 1f # is it a finite number?
85 sll t2, v1, 32 - 20 # get x fraction
86 bne t3, zero, 1f # is it a NAN?
88 bne t2, zero, 1f # is it a NAN?
91 li v0, 1 # x is infinity
94 move v0, zero # x is NOT infinity