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40 //==============================================================
41 // 02/02/00 Initial version
42 // 02/03/00 Modified to improve speed
43 // 05/31/00 Fixed bug when x a double-extended denormal
44 // 05/20/02 Cleaned up namespace and sf0 syntax
45 // 02/10/03 Reordered header: .section, .global, .proc, .align
48 //==============================================================
49 // float significandf(float x)
50 // Overview of operation
51 //==============================================================
52 // If x = sig * 2**n with 1 <= sig < 2
53 // significandf returns sig
55 // predicate registers used:
58 // floating-point registers used:
62 GLOBAL_LIBM_ENTRY(significandf)
64 // qnan snan inf norm unorm 0 -+
67 // f10 gets f8(sign) with f1(exp,significand)
79 // Test for denormal input
82 fclass.m.unc p7,p0 = f8, 0x0b
86 // p6 = TRUE ==> x is not (nan,inf,0)
87 // return sign(f8) exp(f1) significand(f8)
88 // else x is (nan,inf,0)
89 // return sign(f8) exp(f8) significand(f8), normalized.
92 fclass.m.unc p0,p6 = f8, 0xe7
99 (p7) br.cond.spnt SIGNIFICAND_DENORM ;; // Branch if x denormal
104 (p6) fmerge.se f8 = f10,f8
118 fmerge.se f8 = f10,f9
122 // Check if fnorm(x) still denormal, means x double-extended denormal
125 fclass.m.unc p7,p0 = f9, 0x0b
129 // This will be the final result unless x double-extended denormal
136 // If x double-extended denorm, then significand ok, but must merge in
140 (p7) fmerge.se f8 = f10,f8
144 // Final normalization if x double-extended denorm
147 (p7) fnorm.s.s0 f8 = f8
151 GLOBAL_LIBM_END(significandf)