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+.file "tanf.s"
+
+// Copyright (c) 2000, 2001, Intel Corporation
+// All rights reserved.
+//
+// Contributed 2/2/2000 by John Harrison, Ted Kubaska, Bob Norin, Shane Story,
+// and Ping Tak Peter Tang of the Computational Software Lab, Intel Corporation.
+//
+// WARRANTY DISCLAIMER
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING
+// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Intel Corporation is the author of this code, and requests that all
+// problem reports or change requests be submitted to it directly at
+// http://developer.intel.com/opensource.
+//
+// History
+//==============================================================
+// 2/02/00: Initial version
+// 4/04/00 Unwind support added
+// 12/27/00 Improved speed
+//
+// API
+//==============================================================
+// float tan( float x);
+//
+// Overview of operation
+//==============================================================
+// If the input value in radians is |x| >= 1.xxxxx 2^10 call the
+// older slower version.
+//
+// The new algorithm is used when |x| <= 1.xxxxx 2^9.
+//
+// Represent the input X as Nfloat * pi/2 + r
+// where r can be negative and |r| <= pi/4
+//
+// tan_W = x * 2/pi
+// Nfloat = round_int(tan_W)
+//
+// tan_r = x - Nfloat * (pi/2)_hi
+// tan_r = tan_r - Nfloat * (pi/2)_lo
+//
+// We have two paths: p8, when Nfloat is even and p9. when Nfloat is odd.
+// p8: tan(X) = tan(r)
+// p9: tan(X) = -cot(r)
+//
+// Each is evaluated as a series. The p9 path requires 1/r.
+//
+// The coefficients used in the series are stored in a table as
+// are the pi constants.
+//
+// Registers used
+//==============================================================
+//
+// predicate registers used:
+// p6-10
+//
+// floating-point registers used:
+// f10-15, f32-105
+// f8, input
+//
+// general registers used
+// r14-18, r32-43
+//
+
+#include "libm_support.h"
+
+// Assembly macros
+//==============================================================
+TAN_INV_PI_BY_2_2TO64 = f10
+TAN_RSHF_2TO64 = f11
+TAN_2TOM64 = f12
+TAN_RSHF = f13
+TAN_W_2TO64_RSH = f14
+TAN_NFLOAT = f15
+
+tan_Inv_Pi_by_2 = f32
+tan_Pi_by_2_hi = f33
+tan_Pi_by_2_lo = f34
+
+
+tan_P0 = f35
+tan_P1 = f36
+tan_P2 = f37
+tan_P3 = f38
+tan_P4 = f39
+tan_P5 = f40
+tan_P6 = f41
+tan_P7 = f42
+tan_P8 = f43
+tan_P9 = f44
+tan_P10 = f45
+tan_P11 = f46
+tan_P12 = f47
+tan_P13 = f48
+tan_P14 = f49
+tan_P15 = f50
+
+tan_Q0 = f51
+tan_Q1 = f52
+tan_Q2 = f53
+tan_Q3 = f54
+tan_Q4 = f55
+tan_Q5 = f56
+tan_Q6 = f57
+tan_Q7 = f58
+tan_Q8 = f59
+tan_Q9 = f60
+tan_Q10 = f61
+
+tan_r = f62
+tan_rsq = f63
+tan_rcube = f64
+
+tan_v18 = f65
+tan_v16 = f66
+tan_v17 = f67
+tan_v12 = f68
+tan_v13 = f69
+tan_v7 = f70
+tan_v8 = f71
+tan_v4 = f72
+tan_v5 = f73
+tan_v15 = f74
+tan_v11 = f75
+tan_v14 = f76
+tan_v3 = f77
+tan_v6 = f78
+tan_v10 = f79
+tan_v2 = f80
+tan_v9 = f81
+tan_v1 = f82
+tan_int_Nfloat = f83
+tan_Nfloat = f84
+
+tan_NORM_f8 = f85
+tan_W = f86
+
+tan_y0 = f87
+tan_d = f88
+tan_y1 = f89
+tan_dsq = f90
+tan_y2 = f91
+tan_d4 = f92
+tan_inv_r = f93
+
+tan_z1 = f94
+tan_z2 = f95
+tan_z3 = f96
+tan_z4 = f97
+tan_z5 = f98
+tan_z6 = f99
+tan_z7 = f100
+tan_z8 = f101
+tan_z9 = f102
+tan_z10 = f103
+tan_z11 = f104
+tan_z12 = f105
+
+
+/////////////////////////////////////////////////////////////
+
+tan_GR_sig_inv_pi_by_2 = r14
+tan_GR_rshf_2to64 = r15
+tan_GR_exp_2tom64 = r16
+tan_GR_n = r17
+tan_GR_rshf = r18
+
+tan_AD = r33
+tan_GR_10009 = r34
+tan_GR_17_ones = r35
+tan_GR_N_odd_even = r36
+tan_GR_N = r37
+tan_signexp = r38
+tan_exp = r39
+tan_ADQ = r40
+
+GR_SAVE_PFS = r41
+GR_SAVE_B0 = r42
+GR_SAVE_GP = r43
+
+
+#ifdef _LIBC
+.rodata
+#else
+.data
+#endif
+
+.align 16
+
+double_tan_constants:
+ASM_TYPE_DIRECTIVE(double_tan_constants,@object)
+// data8 0xA2F9836E4E44152A, 0x00003FFE // 2/pi
+ data8 0xC90FDAA22168C234, 0x00003FFF // pi/2 hi
+
+ data8 0xBEEA54580DDEA0E1 // P14
+ data8 0x3ED3021ACE749A59 // P15
+ data8 0xBEF312BD91DC8DA1 // P12
+ data8 0x3EFAE9AFC14C5119 // P13
+ data8 0x3F2F342BF411E769 // P8
+ data8 0x3F1A60FC9F3B0227 // P9
+ data8 0x3EFF246E78E5E45B // P10
+ data8 0x3F01D9D2E782875C // P11
+ data8 0x3F8226E34C4499B6 // P4
+ data8 0x3F6D6D3F12C236AC // P5
+ data8 0x3F57DA1146DCFD8B // P6
+ data8 0x3F43576410FE3D75 // P7
+ data8 0x3FD5555555555555 // P0
+ data8 0x3FC11111111111C2 // P1
+ data8 0x3FABA1BA1BA0E850 // P2
+ data8 0x3F9664F4886725A7 // P3
+ASM_SIZE_DIRECTIVE(double_tan_constants)
+
+double_Q_tan_constants:
+ASM_TYPE_DIRECTIVE(double_Q_tan_constants,@object)
+ data8 0xC4C6628B80DC1CD1, 0x00003FBF // pi/2 lo
+ data8 0x3E223A73BA576E48 // Q8
+ data8 0x3DF54AD8D1F2CA43 // Q9
+ data8 0x3EF66A8EE529A6AA // Q4
+ data8 0x3EC2281050410EE6 // Q5
+ data8 0x3E8D6BB992CC3CF5 // Q6
+ data8 0x3E57F88DE34832E4 // Q7
+ data8 0x3FD5555555555555 // Q0
+ data8 0x3F96C16C16C16DB8 // Q1
+ data8 0x3F61566ABBFFB489 // Q2
+ data8 0x3F2BBD77945C1733 // Q3
+ data8 0x3D927FB33E2B0E04 // Q10
+ASM_SIZE_DIRECTIVE(double_Q_tan_constants)
+
+
+
+.align 32
+.global tanf#
+#ifdef _LIBC
+.global __tanf#
+#endif
+
+////////////////////////////////////////////////////////
+
+
+
+.section .text
+.proc tanf#
+#ifdef _LIBC
+.proc __tanf#
+#endif
+.align 32
+tanf:
+#ifdef _LIBC
+__tanf:
+#endif
+// The initial fnorm will take any unmasked faults and
+// normalize any single/double unorms
+
+{ .mlx
+ alloc r32=ar.pfs,1,11,0,0
+ movl tan_GR_sig_inv_pi_by_2 = 0xA2F9836E4E44152A // significand of 2/pi
+}
+{ .mlx
+ addl tan_AD = @ltoff(double_tan_constants), gp
+ movl tan_GR_rshf_2to64 = 0x47e8000000000000 // 1.1000 2^(63+63+1)
+}
+;;
+
+{ .mfi
+ ld8 tan_AD = [tan_AD]
+ fnorm tan_NORM_f8 = f8
+ mov tan_GR_exp_2tom64 = 0xffff-64 // exponent of scaling factor 2^-64
+}
+{ .mlx
+ nop.m 999
+ movl tan_GR_rshf = 0x43e8000000000000 // 1.1000 2^63 for right shift
+}
+;;
+
+
+// Form two constants we need
+// 2/pi * 2^1 * 2^63, scaled by 2^64 since we just loaded the significand
+// 1.1000...000 * 2^(63+63+1) to right shift int(W) into the significand
+{ .mmi
+ setf.sig TAN_INV_PI_BY_2_2TO64 = tan_GR_sig_inv_pi_by_2
+ setf.d TAN_RSHF_2TO64 = tan_GR_rshf_2to64
+ mov tan_GR_17_ones = 0x1ffff ;;
+}
+
+
+// Form another constant
+// 2^-64 for scaling Nfloat
+// 1.1000...000 * 2^63, the right shift constant
+{ .mmf
+ setf.exp TAN_2TOM64 = tan_GR_exp_2tom64
+ adds tan_ADQ = double_Q_tan_constants - double_tan_constants, tan_AD
+ fclass.m.unc p6,p0 = f8, 0x07 // Test for x=0
+}
+;;
+
+
+// Form another constant
+// 2^-64 for scaling Nfloat
+// 1.1000...000 * 2^63, the right shift constant
+{ .mmf
+ setf.d TAN_RSHF = tan_GR_rshf
+ ldfe tan_Pi_by_2_hi = [tan_AD],16
+ fclass.m.unc p7,p0 = f8, 0x23 // Test for x=inf
+}
+;;
+
+{ .mfb
+ ldfe tan_Pi_by_2_lo = [tan_ADQ],16
+ fclass.m.unc p8,p0 = f8, 0xc3 // Test for x=nan
+(p6) br.ret.spnt b0 ;; // Exit for x=0
+}
+
+{ .mfi
+ ldfpd tan_P14,tan_P15 = [tan_AD],16
+(p7) frcpa.s0 f8,p9=f0,f0 // Set qnan indef if x=inf
+ mov tan_GR_10009 = 0x10009
+}
+{ .mib
+ ldfpd tan_Q8,tan_Q9 = [tan_ADQ],16
+ nop.i 999
+(p7) br.ret.spnt b0 ;; // Exit for x=inf
+}
+
+{ .mfi
+ ldfpd tan_P12,tan_P13 = [tan_AD],16
+(p8) fma.s f8=f8,f1,f8 // Set qnan if x=nan
+ nop.i 999
+}
+{ .mib
+ ldfpd tan_Q4,tan_Q5 = [tan_ADQ],16
+ nop.i 999
+(p8) br.ret.spnt b0 ;; // Exit for x=nan
+}
+
+{ .mmi
+ getf.exp tan_signexp = tan_NORM_f8
+ ldfpd tan_P8,tan_P9 = [tan_AD],16
+ nop.i 999 ;;
+}
+
+// Multiply x by scaled 2/pi and add large const to shift integer part of W to
+// rightmost bits of significand
+{ .mfi
+ ldfpd tan_Q6,tan_Q7 = [tan_ADQ],16
+ fma.s1 TAN_W_2TO64_RSH = tan_NORM_f8,TAN_INV_PI_BY_2_2TO64,TAN_RSHF_2TO64
+ nop.i 999 ;;
+}
+
+{ .mmi
+ ldfpd tan_P10,tan_P11 = [tan_AD],16
+ nop.m 999
+ and tan_exp = tan_GR_17_ones, tan_signexp ;;
+}
+
+
+// p7 is true if we must call DBX TAN
+// p7 is true if f8 exp is > 0x10009 (which includes all ones
+// NAN or inf)
+{ .mmi
+ ldfpd tan_Q0,tan_Q1 = [tan_ADQ],16
+ cmp.ge.unc p7,p0 = tan_exp,tan_GR_10009
+ nop.i 999 ;;
+}
+
+
+{ .mmb
+ ldfpd tan_P4,tan_P5 = [tan_AD],16
+ nop.m 999
+(p7) br.cond.spnt L(TAN_DBX) ;;
+}
+
+
+{ .mmi
+ ldfpd tan_Q2,tan_Q3 = [tan_ADQ],16
+ nop.m 999
+ nop.i 999 ;;
+}
+
+
+
+// TAN_NFLOAT = Round_Int_Nearest(tan_W)
+{ .mfi
+ ldfpd tan_P6,tan_P7 = [tan_AD],16
+ fms.s1 TAN_NFLOAT = TAN_W_2TO64_RSH,TAN_2TOM64,TAN_RSHF
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ ldfd tan_Q10 = [tan_ADQ]
+ nop.f 999
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ ldfpd tan_P0,tan_P1 = [tan_AD],16
+ nop.f 999
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ getf.sig tan_GR_n = TAN_W_2TO64_RSH
+ nop.f 999
+ nop.i 999 ;;
+}
+
+// tan_r = -tan_Nfloat * tan_Pi_by_2_hi + x
+{ .mfi
+ ldfpd tan_P2,tan_P3 = [tan_AD]
+ fnma.s1 tan_r = TAN_NFLOAT, tan_Pi_by_2_hi, tan_NORM_f8
+ nop.i 999 ;;
+}
+
+
+// p8 ==> even
+// p9 ==> odd
+{ .mmi
+ and tan_GR_N_odd_even = 0x1, tan_GR_n ;;
+ nop.m 999
+ cmp.eq.unc p8,p9 = tan_GR_N_odd_even, r0 ;;
+}
+
+
+// tan_r = tan_r -tan_Nfloat * tan_Pi_by_2_lo
+{ .mfi
+ nop.m 999
+ fnma.s1 tan_r = TAN_NFLOAT, tan_Pi_by_2_lo, tan_r
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+ fma.s1 tan_rsq = tan_r, tan_r, f0
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p9) frcpa.s1 tan_y0, p10 = f1,tan_r
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v18 = tan_rsq, tan_P15, tan_P14
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v4 = tan_rsq, tan_P1, tan_P0
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v16 = tan_rsq, tan_P13, tan_P12
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v17 = tan_rsq, tan_rsq, f0
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v12 = tan_rsq, tan_P9, tan_P8
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v13 = tan_rsq, tan_P11, tan_P10
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v7 = tan_rsq, tan_P5, tan_P4
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v8 = tan_rsq, tan_P7, tan_P6
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p9) fnma.s1 tan_d = tan_r, tan_y0, f1
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v5 = tan_rsq, tan_P3, tan_P2
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z11 = tan_rsq, tan_Q9, tan_Q8
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z12 = tan_rsq, tan_rsq, f0
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v15 = tan_v17, tan_v18, tan_v16
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z7 = tan_rsq, tan_Q5, tan_Q4
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v11 = tan_v17, tan_v13, tan_v12
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z8 = tan_rsq, tan_Q7, tan_Q6
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v14 = tan_v17, tan_v17, f0
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z3 = tan_rsq, tan_Q1, tan_Q0
+ nop.i 999 ;;
+}
+
+
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v3 = tan_v17, tan_v5, tan_v4
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v6 = tan_v17, tan_v8, tan_v7
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_y1 = tan_y0, tan_d, tan_y0
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_dsq = tan_d, tan_d, f0
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z10 = tan_z12, tan_Q10, tan_z11
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z9 = tan_z12, tan_z12,f0
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z4 = tan_rsq, tan_Q3, tan_Q2
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z6 = tan_z12, tan_z8, tan_z7
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v10 = tan_v14, tan_v15, tan_v11
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_y2 = tan_y1, tan_d, tan_y0
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_d4 = tan_dsq, tan_dsq, tan_d
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v2 = tan_v14, tan_v6, tan_v3
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v9 = tan_v14, tan_v14, f0
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z2 = tan_z12, tan_z4, tan_z3
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z5 = tan_z9, tan_z10, tan_z6
+ nop.i 999 ;;
+}
+
+
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_inv_r = tan_d4, tan_y2, tan_y0
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_rcube = tan_rsq, tan_r, f0
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s1 tan_v1 = tan_v9, tan_v10, tan_v2
+ nop.i 999
+}
+{ .mfi
+ nop.m 999
+(p9) fma.s1 tan_z1 = tan_z9, tan_z5, tan_z2
+ nop.i 999 ;;
+}
+
+
+
+{ .mfi
+ nop.m 999
+(p8) fma.s.s0 f8 = tan_v1, tan_rcube, tan_r
+ nop.i 999
+}
+{ .mfb
+ nop.m 999
+(p9) fms.s.s0 f8 = tan_r, tan_z1, tan_inv_r
+ br.ret.sptk b0 ;;
+}
+.endp tanf#
+ASM_SIZE_DIRECTIVE(tanf#)
+
+
+.proc __libm_callout
+__libm_callout:
+L(TAN_DBX):
+.prologue
+
+{ .mfi
+ nop.m 0
+ fmerge.s f9 = f0,f0
+.save ar.pfs,GR_SAVE_PFS
+ mov GR_SAVE_PFS=ar.pfs
+}
+;;
+
+{ .mfi
+ mov GR_SAVE_GP=gp
+ nop.f 0
+.save b0, GR_SAVE_B0
+ mov GR_SAVE_B0=b0
+}
+
+.body
+{ .mfb
+ nop.m 999
+ nop.f 999
+ br.call.sptk.many b0=__libm_tan# ;;
+}
+
+
+{ .mfi
+ mov gp = GR_SAVE_GP
+ fnorm.s f8 = f8
+ mov b0 = GR_SAVE_B0
+}
+;;
+
+
+{ .mib
+ nop.m 999
+ mov ar.pfs = GR_SAVE_PFS
+ br.ret.sptk b0
+;;
+}
+
+
+.endp __libm_callout
+ASM_SIZE_DIRECTIVE(__libm_callout)
+
+.type __libm_tan#,@function
+.global __libm_tan#
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