?? s_cbrtf.s
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0xa11cdaa36068a57d, 0xcafd4283d8043dfd data8 0xffc01fed60f86fb5, 0xa137a99cbd3f880b data8 0xcb1f09520d37c6fb, 0xffeaae3832b63956LOCAL_OBJECT_END(T_table).section .textGLOBAL_LIBM_ENTRY(cbrtf){.mfi getf.sig GR_SIGNIF = f8 // will continue only for normal/denormal numbers fclass.nm.unc p12, p7 = f8, 0x1b // GR_GP = pointer to C_1, C_2 followed by T_table nop.i 0}{.mfi addl GR_GP = @ltoff(poly_coeffs), gp // normalize a fma.s1 FR_ARG = f8, f1, f0 // GR_CT3 = bias-((2^8-1)/3) -63 = 0xffff-0x55-0x3f = 0xff6b mov GR_CT3 = 0xff6b ;;}{.mmi // get exponent getf.exp GR_ARGEXP = f8 // load start address for C_1, C_2 followed by T_table ld8 GR_ADDR = [ GR_GP ] nop.i 0 ;;}{.mlx // check if input significand is 0 (p7) cmp.eq p12, p7 = GR_SIGNIF, r0 // GR_2P63 = 2^63 movl GR_2P63 = 0x8000000000000000 ;;}{.mfi nop.m 0 // y = frcpa(a) // p7 = 1 for normal and denormal (but non-zero) arguments (p7) frcpa.s0 FR_Y, p0 = f1, f8 // p9 = 1 if denormal input cmp.gtu p9, p0 = GR_2P63, GR_SIGNIF}{.mfb // load C_1 ldfe FR_COEFF1 = [ GR_ADDR ], 16 // if argument is 0, +/-Infinity, or NaN, return (p12) fma.s.s0 f8 = f8, f1, f0 (p12) br.ret.spnt b0 ;;}{.mmi // get normalized significand (for denormal inputs only) (p9) getf.sig GR_SIGNIF = FR_ARG // load C_2 ldfe FR_COEFF2 = [ GR_ADDR ], 16 // GR_CT2 = bias-(2^8-1) mov GR_CT2 = 0xff00}{.mii // get exponent (for denormal inputs only) (p9) getf.exp GR_ARGEXP = FR_ARG nop.i 0 mov GR_CONST = 0x20000 ;;}{.mii // get GR_SIGN = sign and GR_SIGN = GR_ARGEXP, GR_CONST // eliminate leading 1 from GR_I1 = 1st table index shl GR_I1 = GR_SIGNIF, 1 // eliminate sign from exponent andcm GR_EBIAS = GR_ARGEXP, GR_CONST ;;}{.mfi // subtract bias from GR_EXP = exponent sub GR_EXP = GR_EBIAS, GR_CT2 // r = 1-a*y fnma.s1 FR_R = FR_Y, FR_ARG, f1 // GR_IT1 = 1st table index (y_index8 bits) shr.u GR_IT1 = GR_I1, 56 ;;}{.mii // 1: exponent* = 5; // (2^{16}-1)/3 = 0x5555 shladd GR_E5 = GR_EXP, 2, GR_EXP // GR_IT1_3 = 3*y_index shladd GR_IT1_3 = GR_IT1, 1, GR_IT1 nop.i 0 ;;}{.mmi // GR_TMP5 = (5*expon)*16+5*expon = (0x55)*expon shladd GR_TMP5 = GR_E5, 4, GR_E5 // adjust T_table pointer by 1st index shladd GR_TP1 = GR_IT1_3, 3, GR_ADDR nop.i 0 ;;}{.mmi // FR_T0 = T [ 0 ] [ y ] ldf8 FR_T0 = [ GR_TP1 ], 8 // get 2^{-63} mov GR_TMP63 = 0xffff + 63 // GR_TMP = (0x5500)*expon shl GR_TMP = GR_TMP5, 8 ;;}{.mfi // FR_T1 = T [ 1 ] [ y ] ldf8 FR_T1 = [ GR_TP1 ], 8 // P_1 = C_1+C_2*r fma.s1 FR_COEFF1 = FR_COEFF2, FR_R, FR_COEFF1 // GR_TMP2 = (0x5555)*expon add GR_TMP2 = GR_TMP, GR_TMP5 ;;}{.mmi // GR_TMP3 = (0x5556)*expon // 0x5556 = (2^{16}+2)/3 add GR_TMP3 = GR_TMP2, GR_EXP ;; // FR_T2 = T [ 2 ] [ y ] ldf8 FR_T2 = [ GR_TP1 ] // GR_EXP3 = floor(expon/3) shr GR_EXP3 = GR_TMP3, 16 ;;}{.mmi setf.exp FR_2M63 = GR_TMP63 // GR_TMP4 = 3*exponent shladd GR_TMP4 = GR_EXP3, 1, GR_EXP3 // bias exponent add GR_EBIAS3 = GR_CT3, GR_EXP3 ;;}{.mmf // get remainder of exponent/3 sub GR_REM = GR_EXP, GR_TMP4 // add sign to exponent or GR_SEXP = GR_EBIAS3, GR_SIGN // P_2 = -r*P_1 fnma.s1 FR_R = FR_COEFF1, FR_R, f0 ;;}{.mmi // FR_ARG = sign*2^{exponent/3} setf.exp FR_ARG = GR_SEXP nop.m 0 // remainder = 0 ? // p7=1 if input exponent is 3*j (remainder is 0) cmp.eq.unc p7, p8 = r0, GR_REM ;;}{.mfi // remainder = 1 ? // p8=1 if input exponent is 3*j+1 (remainder is 1) // p12=1 if input exponent is 3*j+2 (remainder is 2) (p8) cmp.eq.unc p8, p12 = 1, GR_REM // p7=1 -> remainder = 0 -> use T = FR_T0 (p7) fma.s1 f8 = FR_T0, FR_R, FR_T0 // argument is of the form 2^(3*k) ? // ( GR_I1 holds significand bits, without the leading 1) or GR_I1 = GR_I1, GR_REM ;;}.pred.rel "mutex", p12, p8{.mfi nop.m 0 // p8=1 -> remainder = 1 -> use FR_T1 (p8) fma.s1 f8 = FR_T1, FR_R, FR_T1 // argument is of the form 2^(3*k) ? cmp.eq p14, p7 = GR_I1, r0}{.mfi nop.m 0 // p12=1 -> remainder=2 -> result = T+T*P_2 (p12) fma.s1 f8 = FR_T2, FR_R, FR_T2 nop.i 0 ;;}.pred.rel "mutex", p14, p7{.mfi nop.m 0 // if argument is sgn*2^{3*(expon/3)} (p14) fma.s.s0 f8 = FR_2M63, FR_ARG, f0 nop.i 0}{.mfb nop.m 0 // T* = sgn*2^{expon/3} (p7) fma.s.s0 f8 = f8, FR_ARG, f0 br.ret.sptk b0 ;;}GLOBAL_LIBM_END(cbrtf)
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