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.file "atan2f.s"
// Copyright (c) 2000, 2001, Intel Corporation// All rights reserved.//// Contributed 6/1/2000 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//==============================================================// 6/01/00 Initial version// 8/15/00 Bundle added after call to __libm_error_support to properly// set [the previously overwritten] GR_Parameter_RESULT.// 8/17/00 Changed predicate register macro-usage to direct predicate// names due to an assembler bug.// 1/05/01 Fixed flag settings for denormal input.// 1/19/01 Added documentation// 1/30/01 Improved speed
// Description//=========================================// The atan2 function computes the principle value of the arc tangent of y/x using// the signs of both arguments to determine the quadrant of the return value.// A domain error may occur if both arguments are zero.
// The atan2 function returns the arc tangent of y/x in the range [-pi,+pi] radians.
//..//..Let (v,u) = (y,x) if |y| <= |x|, and (v,u) = (x,y) otherwise. Note that//..v and u can be negative. We state the relationship between atan2(y,x) and//..atan(v/u).//..//..Let swap = false if v = y, and swap = true if v = x.//..Define C according to the matrix//..//.. TABLE FOR C//.. x +ve x -ve//.. no swap (swap = false) sgn(y)*0 sgn(y)*pi//.. swap (swap = true ) sgn(y)*pi/2 sgn(y)*pi/2//..//.. atan2(y,x) = C + atan(v/u) if no swap//.. atan2(y,x) = C - atan(v/u) if swap//..//..These relationship is more efficient to compute as we accommodate signs in v and u//..saving the need to obtain the absolute value before computation can proceed.//..//..Suppose (v,u) = (y,x), we calculate atan(v/u) as follows://..A = y * frcpa(x) (so A = (y/x)(1 - beta))//..atan(y/x) = atan(A) + atan( ((y/x)-A))/(1 + (y/x)A) ), the second term is //..a correction.//..atan(A) is approximated by a polynomial //..A + p1 A^3 + p2 A^5 + ... + p10 A^21,//..atan(G) is approximated as follows://..Let G = (y - Ax)/(x + Ay), atan(G) can be approximated by G + g * p1//..where g is a limited precision approximation to G via g = (y - Ax)*frcpa(x + Ay).//..//..Suppose (v,u) = (x,y), we calculate atan(v/u) as follows://..Z = x * frcpa(y) (so Z = (x/y)(1 - beta))//..atan(x/y) = atan(Z) + atan( ((x/y)-Z))/(1 + (x/y)Z) ), the second term is //..a correction.//..atan(Z) is approximated by a polynomial //..Z + p1 Z^3 + p2 Z^5 + ... + p10 Z^21,//..atan(T) is approximated as follows://..Let T = (x - Ay)/(y + Ax), atan(T) can be approximated by T + t * p1//..where t is a limited precision approximation to T via t = (x - Ay)*frcpa(y + Ax).//..//..//..A = y * frcpa(x)//..atan(A) ~=~ A + p1 A^3 + ... + P10 A^21//..//..This polynomial is computed as follows://..Asq = A*A; Acub = A*Asq, A4 = Asq*Asq
//..A5 = Asq*Acub, A6 = Asq*A4; A11 = A5 * A6
//..//..poly_A1 = p9 + Asq*p10, poly_A2 = p7 + Asq*p8, poly_A3 = p5 + Asq*p6//..poly_A1 = poly_A2 + A4 * poly_A1//..poly_A1 = poly_A3 + A4 * poly_A1//..//..poly_A4 = p1 * A//,,poly_A5 = p3 + Asq * p4, poly_A4 = A + Asq*poly_A4//..poly_A5 = p2 + Asq * poly_A5 //..poly_A4 = poly_A4 + A5 * poly_A5//..//..atan_A = poly_A4 + A11 * poly_A1//..//..atan(G) is approximated as follows://..G_numer = y - A*x, G_denom = x + A*y//..H1 = frcpa(G_denom)//..H_beta = 1 - H1 * G_denom//..H2 = H1 + H1 * H_beta//..H_beta2 = H_beta*H_beta//..H3 = H2 + H2*H_beta2//..g = H1 * G_numer; gsq = g*g; atan_G = g*p1, atan_G = atan_G*gsq
//..atan_G = G_numer*H3 + atan_G//..//..//..A = y * frcpa(x)//..atan(A) ~=~ A + p1 A^3 + ... + P10 A^21//..//..This polynomial is computed as follows://..Asq = A*A; Acub = A*Asq, A4 = Asq*Asq
//..A5 = Asq*Acub, A6 = Asq*A4; A11 = A5 * A6
//..//..poly_A1 = p9 + Asq*p10, poly_A2 = p7 + Asq*p8, poly_A3 = p5 + Asq*p6//..poly_A1 = poly_A2 + A4 * poly_A1//..poly_A1 = poly_A3 + A4 * poly_A1//..//..poly_A4 = p1 * A//,,poly_A5 = p3 + Asq * p4, poly_A4 = A + Asq*poly_A4//..poly_A5 = p2 + Asq * poly_A5 //..poly_A4 = poly_A4 + A5 * poly_A5//..//..atan_A = poly_A4 + A11 * poly_A1//..//..//..====================================================================//.. COEFFICIENTS USED IN THE COMPUTATION//..====================================================================
//coef_pj, j = 1,2,...,10; atan(A) ~=~ A + p1 A^3 + p2 A^5 + ... + p10 A^21
//// coef_p1 = -.3333332707155439167401311806315789E+00// coef_p1 in dbl = BFD5 5555 1219 1621 //// coef_p2 = .1999967670926658391827857030875748E+00// coef_p2 in dbl = 3FC9 997E 7AFB FF4E //// coef_p3 = -.1427989384500152360161563301087296E+00// coef_p3 in dbl = BFC2 473C 5145 EE38 //// coef_p4 = .1105852823460720770079031213661163E+00// coef_p4 in dbl = 3FBC 4F51 2B18 65F5 //// coef_p5 = -.8811839915595312348625710228448363E-01// coef_p5 in dbl = BFB6 8EED 6A8C FA32 //// coef_p6 = .6742329836955067042153645159059714E-01// coef_p6 in dbl = 3FB1 42A7 3D7C 54E3 //// coef_p7 = -.4468571068774672908561591262231909E-01// coef_p7 in dbl = BFA6 E10B A401 393F //// coef_p8 = .2252333246746511135532726960586493E-01// coef_p8 in dbl = 3F97 105B 4160 F86B //// coef_p9 = -.7303884867007574742501716845542314E-02// coef_p9 in dbl = BF7D EAAD AA33 6451 //// coef_p10 = .1109686868355312093949039454619058E-02// coef_p10 in dbl = 3F52 2E5D 33BC 9BAA //
// Special values//==============================================================// Y x Result// +number +inf +0// -number +inf -0// +number -inf +pi// -number -inf -pi//// +inf +number +pi/2// -inf +number -pi/2// +inf -number +pi/2// -inf -number -pi/2//// +inf +inf +pi/4// -inf +inf -pi/4// +inf -inf +3pi/4// -inf -inf -3pi/4//// +1 +1 +pi/4// -1 +1 -pi/4// +1 -1 +3pi/4// -1 -1 -3pi/4//// +number +0 +pi/2 // does not raise DBZ// -number +0 -pi/2 // does not raise DBZ// +number -0 +pi/2 // does not raise DBZ// -number -0 -pi/2 // does not raise DBZ//// +0 +number +0// -0 +number -0// +0 -number +pi// -0 -number -pi//// +0 +0 +0 // does not raise invalid// -0 +0 -0 // does not raise invalid// +0 -0 +pi // does not raise invalid// -0 -0 -pi // does not raise invalid//// Nan anything quiet Y// anything NaN quiet X
// atan2(+-0/+-0) sets double error tag to 37// atan2f(+-0/+-0) sets single error tag to 38// These are domain errors.
//// Assembly macros//=========================================
// integer registersatan2f_GR_Addr_1 = r33atan2f_GR_Addr_2 = r34GR_SAVE_B0 = r35
GR_SAVE_PFS = r36GR_SAVE_GP = r37
GR_Parameter_X = r38GR_Parameter_Y = r39GR_Parameter_RESULT = r40GR_Parameter_TAG = r41
// floating point registersatan2f_coef_p1 = f32atan2f_coef_p10 = f33atan2f_coef_p7 = f34atan2f_coef_p6 = f35
atan2f_coef_p3 = f36atan2f_coef_p2 = f37atan2f_coef_p9 = f38atan2f_coef_p8 = f39atan2f_coef_p5 = f40
atan2f_coef_p4 = f41atan2f_const_piby2 = f42atan2f_const_pi = f43atan2f_const_piby4 = f44atan2f_const_3piby4 = f45
atan2f_xsq = f46atan2f_ysq = f47atan2f_xy = f48atan2f_const_1 = f49atan2f_sgn_Y = f50
atan2f_Z0 = f51atan2f_A0 = f52atan2f_Z = f53atan2f_A = f54atan2f_C = f55
atan2f_U = f56atan2f_Usq = f57atan2f_U4 = f58atan2f_U6 = f59atan2f_U8 = f60
atan2f_poly_u109 = f61atan2f_poly_u87 = f62atan2f_poly_u65 = f63atan2f_poly_u43 = f64atan2f_poly_u21 = f65
atan2f_poly_u10to7 = f66atan2f_poly_u6to3 = f67atan2f_poly_u10to3 = f68atan2f_poly_u10to0 = f69atan2f_poly_u210 = f70
atan2f_T_numer = f71atan2f_T_denom = f72atan2f_G_numer = f73atan2f_G_denom = f74atan2f_p1rnum = f75
atan2f_R_denom = f76atan2f_R_numer = f77atan2f_pR = f78atan2f_pRC = f79atan2f_pQRC = f80
atan2f_Q1 = f81atan2f_Q_beta = f82atan2f_Q2 = f83atan2f_Q_beta2 = f84atan2f_Q3 = f85
atan2f_r = f86atan2f_rsq = f87atan2f_poly_atan_U = f88
// predicate registers//atan2f_Pred_Swap = p6 // |y| > |x|//atan2f_Pred_noSwap = p7 // |y| <= |x|//atan2f_Pred_Xpos = p8 // x >= 0//atan2f_Pred_Xneg = p9 // x < 0
.data
.align 16
atan2f_coef_table1:data8 0xBFD5555512191621 // p1data8 0x3F522E5D33BC9BAA // p10data8 0xBFA6E10BA401393F // p7data8 0x3FB142A73D7C54E3 // p6data8 0xBFC2473C5145EE38 // p3data8 0x3FC9997E7AFBFF4E // p2
atan2f_coef_table2:data8 0xBF7DEAADAA336451 // p9data8 0x3F97105B4160F86B // p8data8 0xBFB68EED6A8CFA32 // p5data8 0x3FBC4F512B1865F5 // p4data8 0x3ff921fb54442d18 // pi/2data8 0x400921fb54442d18 // pidata8 0x3fe921fb54442d18 // pi/4data8 0x4002d97c7f3321d2 // 3pi/4
.global atan2f
.text.proc atan2f.align 32
atan2f:
{ .mfi alloc r32 = ar.pfs,1,5,4,0 frcpa.s1 atan2f_Z0,p0 = f1,f8 // Approx to 1/y nop.i 999} { .mfi addl atan2f_GR_Addr_1 = @ltoff(atan2f_coef_table1),gp fma.s1 atan2f_xsq = f9,f9,f0 nop.i 999 ;;
}
{ .mfi ld8 atan2f_GR_Addr_1 = [atan2f_GR_Addr_1] frcpa.s1 atan2f_A0,p0 = f1,f9 // Approx to 1/x nop.i 999} { .mfi nop.m 999 fma.s1 atan2f_ysq = f8,f8,f0 nop.i 999 ;;
} { .mfi nop.m 999 fcmp.ge.s1 p8,p9 = f9,f0 // Set p8 if x>=0, p9 if x<0 nop.i 999}{ .mfi nop.m 999 fma.s1 atan2f_xy = f9,f8,f0 nop.i 999 ;;
} { .mfi add atan2f_GR_Addr_2 = 0x30, atan2f_GR_Addr_1 fmerge.s atan2f_sgn_Y = f8,f1 nop.i 999 ;;
} { .mmf ldfpd atan2f_coef_p1,atan2f_coef_p10 = [atan2f_GR_Addr_1],16 ldfpd atan2f_coef_p9,atan2f_coef_p8 = [atan2f_GR_Addr_2],16 fclass.m p10,p0 = f9,0xe7 // Test x @inf|@snan|@qnan|@zero} ;;
{ .mfi ldfpd atan2f_coef_p7,atan2f_coef_p6 = [atan2f_GR_Addr_1],16 fma.s1 atan2f_T_denom = atan2f_Z0,atan2f_xsq,f8 nop.i 999} { .mfi ldfpd atan2f_coef_p5,atan2f_coef_p4 = [atan2f_GR_Addr_2],16 fma.s1 atan2f_Z = atan2f_Z0,f9,f0 nop.i 999 ;;
}
{ .mfi ldfpd atan2f_coef_p3,atan2f_coef_p2 = [atan2f_GR_Addr_1],16 fma.s1 atan2f_G_denom = atan2f_A0,atan2f_ysq,f9 nop.i 999} { .mfi ldfpd atan2f_const_piby2,atan2f_const_pi = [atan2f_GR_Addr_2],16 fma.s1 atan2f_A = atan2f_A0,f8,f0 nop.i 999 ;;
}
{ .mfi ldfpd atan2f_const_piby4,atan2f_const_3piby4 = [atan2f_GR_Addr_2] fclass.m p11,p0 = f8,0xe7 // Test y @inf|@snan|@qnan|@zero nop.i 999} { .mfb nop.m 999 fnma.s1 atan2f_T_numer = atan2f_Z0,atan2f_xy,f9(p10) br.cond.spnt ATAN2F_XY_INF_NAN_ZERO ;; // Branch on x nan,inf,zero
}
// p6 if |y|>|x|, p7 if |x|>=|y| , use xsq and ysq for test{ .mfi nop.m 999 fcmp.gt.s1 p6,p7 = atan2f_ysq,atan2f_xsq nop.i 999}{ .mfb nop.m 999 fnma.s1 atan2f_G_numer = atan2f_A0,atan2f_xy,f8(p11) br.cond.spnt ATAN2F_XY_INF_NAN_ZERO ;; // Branch on y nan,inf,zero
}
{ .mfi nop.m 999(p8) fma.s1 atan2f_const_1 = atan2f_sgn_Y,f0,f0 nop.i 999} { .mfi nop.m 999(p9) fma.s1 atan2f_const_1 = atan2f_sgn_Y,f1,f0 nop.i 999 ;;
}
{ .mfi nop.m 999(p6) fnma.s1 atan2f_U = atan2f_Z,f1,f0 nop.i 999} { .mfi nop.m 999(p6) fma.s1 atan2f_Usq = atan2f_Z,atan2f_Z,f0 nop.i 999 ;;
}
{ .mfi nop.m 999(p7) fma.s1 atan2f_U = atan2f_A,f1,f0 nop.i 999} { .mfi nop.m 999(p7) fma.s1 atan2f_Usq = atan2f_A,atan2f_A,f0 nop.i 999 ;;
}
{ .mfi nop.m 999(p6) frcpa.s1 atan2f_Q1,p0 = f1,atan2f_T_denom nop.i 999} { .mfi nop.m 999(p6) fma.s1 atan2f_R_denom = atan2f_T_denom,f1,f0 nop.i 999 ;;
}
{ .mfi nop.m 999(p7) frcpa.s1 atan2f_Q1,p0 = f1,atan2f_G_denom nop.i 999} { .mfi nop.m 999(p7) fma.s1 atan2f_R_denom = atan2f_G_denom,f1,f0 nop.i 999 ;;
}
{ .mfi nop.m 999(p6) fnma.s1 atan2f_R_numer = atan2f_T_numer,f1,f0 nop.i 999} { .mfi nop.m 999(p7) fma.s1 atan2f_R_numer = atan2f_G_numer,f1,f0 nop.i 999 ;;
}
{ .mfi nop.m 999(p6) fnma.s1 atan2f_p1rnum = atan2f_T_numer,atan2f_coef_p1,f0 nop.i 999 ;;
} { .mfi nop.m 999(p7) fma.s1 atan2f_p1rnum = atan2f_G_numer,atan2f_coef_p1,f0 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_U4 = atan2f_Usq,atan2f_Usq,f0 nop.i 999}{ .mfi nop.m 999 fma.s1 atan2f_poly_u109 = atan2f_Usq,atan2f_coef_p10,atan2f_coef_p9 nop.i 999 ;;
} { .mfi nop.m 999 fma.s1 atan2f_poly_u87 = atan2f_Usq,atan2f_coef_p8,atan2f_coef_p7 nop.i 999} { .mfi nop.m 999 fma.s1 atan2f_poly_u65 = atan2f_Usq,atan2f_coef_p6,atan2f_coef_p5 nop.i 999 ;;
} { .mfi nop.m 999 fma.s1 atan2f_poly_u43 = atan2f_Usq,atan2f_coef_p4,atan2f_coef_p3 nop.i 999} { .mfi nop.m 999 fnma.s1 atan2f_Q_beta = atan2f_Q1,atan2f_R_denom,f1 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_poly_u21 = atan2f_Usq,atan2f_coef_p2,atan2f_coef_p1 nop.i 999} { .mfi nop.m 999 fma.s1 atan2f_r = atan2f_Q1,atan2f_R_numer,f0 nop.i 999 ;;
}
{ .mfi nop.m 999(p6) fma.s1 atan2f_C = atan2f_sgn_Y,atan2f_const_piby2,f0 nop.i 999} { .mfi nop.m 999(p7) fma.s1 atan2f_C = atan2f_const_1,atan2f_const_pi,f0 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_U6 = atan2f_U4,atan2f_Usq,f0 nop.i 999}{ .mfi nop.m 999 fma.s1 atan2f_U8 = atan2f_U4,atan2f_U4,f0 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_poly_u10to7 = atan2f_U4,atan2f_poly_u109,atan2f_poly_u87 nop.i 999} { .mfi nop.m 999 fma.s1 atan2f_pR = atan2f_p1rnum,atan2f_Q1,f0 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_poly_u6to3 = atan2f_U4,atan2f_poly_u65,atan2f_poly_u43 nop.i 999} { .mfi nop.m 999 fma.s1 atan2f_Q2 = atan2f_Q1,atan2f_Q_beta,atan2f_Q1 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_Q_beta2 = atan2f_Q_beta,atan2f_Q_beta,f0 nop.i 999} { .mfi nop.m 999 fma.s1 atan2f_rsq = atan2f_r,atan2f_r,f0 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_poly_u210 = atan2f_Usq,atan2f_poly_u21,f1 nop.i 999 ;;
} { .mfi nop.m 999 fcmp.eq.s0 p8,p0 = f8,f9 // Dummy op to set flag on denormal inputs nop.i 999}{ .mfi nop.m 999 fma.s1 atan2f_poly_u10to3 = atan2f_U8,atan2f_poly_u10to7,atan2f_poly_u6to3 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_Q3 = atan2f_Q2,atan2f_Q_beta2,atan2f_Q2 nop.i 999} { .mfi nop.m 999 fma.s1 atan2f_pRC = atan2f_rsq,atan2f_pR,atan2f_C nop.i 999 ;;
} { .mfi nop.m 999 fma.s1 atan2f_poly_u10to0 = atan2f_U6,atan2f_poly_u10to3,atan2f_poly_u210 nop.i 999 ;;
}
{ .mfi nop.m 999 fma.s1 atan2f_pQRC = atan2f_R_numer,atan2f_Q3,atan2f_pRC nop.i 999 ;;
}
{ .mfb nop.m 999 fma.s.s0 f8 = atan2f_U,atan2f_poly_u10to0,atan2f_pQRC br.ret.sptk b0 ;;
}
ATAN2F_XY_INF_NAN_ZERO:
{ .mfi nop.m 999 fclass.m p10,p0 = f8,0xc3 // Is y nan nop.i 999};;
{ .mfi nop.m 999 fclass.m p12,p0 = f9,0xc3 // Is x nan nop.i 999};;
{ .mfi nop.m 999 fclass.m p6,p0 = f9,0x21 // Is x +inf nop.i 999}{ .mfb nop.m 999(p10) fma.s f8 = f9,f8,f0 // Result quietized y if y is nan(p10) br.ret.spnt b0 // Exit if y is nan};;
{ .mfi nop.m 999(p6) fclass.m.unc p7,p8 = f8,0x23 // x +inf, is y inf nop.i 999}{ .mfb nop.m 999(p12) fnorm.s f8 = f9 // Result quietized x if x is nan, y not nan(p12) br.ret.spnt b0 // Exit if x is nan, y not nan};;
// Here if x or y inf, or x or y zero{ .mfi nop.m 999 fcmp.eq.s0 p15,p0 = f8,f9 // Dummy op to set flag on denormal inputs nop.i 999};;
{ .mfi nop.m 999 fclass.m p11,p12 = f9,0x22 // Is x -inf nop.i 999}{ .mfb nop.m 999(p7) fma.s f8 = atan2f_sgn_Y, atan2f_const_piby4,f0 // Result +-pi/4(p7) br.ret.spnt b0 // Exit if x +inf and y inf};;
{ .mfb nop.m 999(p8) fmerge.s f8 = f8,f0 // If x +inf and y not inf, result +-0(p8) br.ret.spnt b0 // Exit if x +inf and y not inf};;
{ .mfi nop.m 999(p12) fclass.m.unc p13,p0 = f8,0x23 // x not -inf, is y inf nop.i 999};;
{ .mfi nop.m 999(p11) fclass.m.unc p14,p15 = f8,0x23 // x -inf, is y inf nop.i 999};;
{ .mfi nop.m 999 fclass.m p6,p7 = f9,0x7 // Is x zero nop.i 999}{ .mfb nop.m 999(p13) fma.s f8 = atan2f_sgn_Y, atan2f_const_piby2,f0 // Result +-pi/2(p13) br.ret.spnt b0 // Exit if x not -inf and y inf};;
{ .mfi nop.m 999(p14) fma.s f8 = atan2f_sgn_Y, atan2f_const_3piby4,f0 // Result +-3pi/4 nop.i 999}{ .mfb nop.m 999(p15) fma.s f8 = atan2f_sgn_Y, atan2f_const_pi,f0 // Result +-pi(p11) br.ret.spnt b0 // Exit if x -inf};;
// Here if x or y zero{ .mfi nop.m 999(p7) fclass.m.unc p8,p9 = f9,0x19 // x not zero, y zero, is x > zero nop.i 999};;
{ .mfi nop.m 999(p6) fclass.m.unc p10,p11 = f8,0x7 // x zero, is y zero nop.i 999};;
{ .mfi nop.m 999(p8) fmerge.s f8 = f8, f0 // x > zero and y zero, result is +-zero nop.i 999}{ .mfb nop.m 999(p9) fma.s f8 = atan2f_sgn_Y, atan2f_const_pi,f0 // x < 0, y 0, result +-pi(p10) br.cond.spnt __libm_error_region // Branch if x zero and y zero};;
{ .mfb nop.m 999(p11) fma.s f8 = atan2f_sgn_Y, atan2f_const_piby2,f0 // x zero, y not zero br.ret.sptk b0 // Final special case exit};;
.endp atan2f
.proc __libm_error_region__libm_error_region:.prologue mov GR_Parameter_TAG = 38 fclass.m p10,p11 = f9,0x5 // @zero | @pos;;
(p10) fmerge.s f10 = f8, f0(p11) fma.s f10 = atan2f_sgn_Y, atan2f_const_pi,f0;;
{ .mfi add GR_Parameter_Y=-32,sp // Parameter 2 value nop.f 999.save ar.pfs,GR_SAVE_PFS mov GR_SAVE_PFS=ar.pfs // Save ar.pfs}
{ .mfi.fframe 64 add sp=-64,sp // Create new stack nop.f 0 mov GR_SAVE_GP=gp // Save gp};;
{ .mmi stfs [GR_Parameter_Y] = f9,16 // Store Parameter 2 on stack add GR_Parameter_X = 16,sp // Parameter 1 address.save b0, GR_SAVE_B0 mov GR_SAVE_B0=b0 // Save b0};;
.body{ .mib stfs [GR_Parameter_X] = f8 // Store Parameter 1 on stack add GR_Parameter_RESULT = 0,GR_Parameter_Y nop.b 0 // Parameter 3 address}{ .mib stfs [GR_Parameter_Y] = f10 // Store Parameter 3 on stack add GR_Parameter_Y = -16,GR_Parameter_Y br.call.sptk b0=__libm_error_support# // Call error handling function
};;
{ .mmi nop.m 0 nop.m 0 add GR_Parameter_RESULT = 48,sp};;
{ .mmi ldfs f8 = [GR_Parameter_RESULT] // Get return result off stack.restore add sp = 64,sp // Restore stack pointer mov b0 = GR_SAVE_B0 // Restore return address};;
{ .mib mov gp = GR_SAVE_GP // Restore gp mov ar.pfs = GR_SAVE_PFS // Restore ar.pfs br.ret.sptk b0 // Return};;
.endp __libm_error_region
.type __libm_error_support#,@function
.global __libm_error_support#
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