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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | /*---------------------------------------------------------------------------+ | reg_constant.c | | | | All of the constant FPU_REGs | | | | Copyright (C) 1992,1993,1994 | | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, | | Australia. E-mail billm@vaxc.cc.monash.edu.au | | | | | +---------------------------------------------------------------------------*/ #include "fpu_system.h" #include "fpu_emu.h" #include "status_w.h" #include "reg_constant.h" FPU_REG const CONST_1 = { SIGN_POS, TW_Valid, EXP_BIAS, 0x00000000, 0x80000000 }; FPU_REG const CONST_2 = { SIGN_POS, TW_Valid, EXP_BIAS+1, 0x00000000, 0x80000000 }; FPU_REG const CONST_HALF = { SIGN_POS, TW_Valid, EXP_BIAS-1, 0x00000000, 0x80000000 }; FPU_REG const CONST_L2T = { SIGN_POS, TW_Valid, EXP_BIAS+1, 0xcd1b8afe, 0xd49a784b }; FPU_REG const CONST_L2E = { SIGN_POS, TW_Valid, EXP_BIAS, 0x5c17f0bc, 0xb8aa3b29 }; FPU_REG const CONST_PI = { SIGN_POS, TW_Valid, EXP_BIAS+1, 0x2168c235, 0xc90fdaa2 }; FPU_REG const CONST_PI2 = { SIGN_POS, TW_Valid, EXP_BIAS, 0x2168c235, 0xc90fdaa2 }; FPU_REG const CONST_PI4 = { SIGN_POS, TW_Valid, EXP_BIAS-1, 0x2168c235, 0xc90fdaa2 }; FPU_REG const CONST_LG2 = { SIGN_POS, TW_Valid, EXP_BIAS-2, 0xfbcff799, 0x9a209a84 }; FPU_REG const CONST_LN2 = { SIGN_POS, TW_Valid, EXP_BIAS-1, 0xd1cf79ac, 0xb17217f7 }; /* Extra bits to take pi/2 to more than 128 bits precision. */ FPU_REG const CONST_PI2extra = { SIGN_NEG, TW_Valid, EXP_BIAS-66, 0xfc8f8cbb, 0xece675d1 }; /* Only the sign (and tag) is used in internal zeroes */ FPU_REG const CONST_Z = { SIGN_POS, TW_Zero, EXP_UNDER, 0x0, 0x0 }; /* Only the sign and significand (and tag) are used in internal NaNs */ /* The 80486 never generates one of these FPU_REG const CONST_SNAN = { SIGN_POS, TW_NaN, EXP_OVER, 0x00000001, 0x80000000 }; */ /* This is the real indefinite QNaN */ FPU_REG const CONST_QNaN = { SIGN_NEG, TW_NaN, EXP_OVER, 0x00000000, 0xC0000000 }; /* Only the sign (and tag) is used in internal infinities */ FPU_REG const CONST_INF = { SIGN_POS, TW_Infinity, EXP_OVER, 0x00000000, 0x80000000 }; static void fld_const(FPU_REG const *c) { FPU_REG *st_new_ptr; if ( STACK_OVERFLOW ) { stack_overflow(); return; } push(); reg_move(c, st_new_ptr); clear_C1(); } static void fld1(void) { fld_const(&CONST_1); } static void fldl2t(void) { fld_const(&CONST_L2T); } static void fldl2e(void) { fld_const(&CONST_L2E); } static void fldpi(void) { fld_const(&CONST_PI); } static void fldlg2(void) { fld_const(&CONST_LG2); } static void fldln2(void) { fld_const(&CONST_LN2); } static void fldz(void) { fld_const(&CONST_Z); } static FUNC constants_table[] = { fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, FPU_illegal }; void fconst(void) { (constants_table[FPU_rm])(); } |