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Diffstat (limited to 'sysdeps/ia64/fpu/e_acos.S')
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diff --git a/sysdeps/ia64/fpu/e_acos.S b/sysdeps/ia64/fpu/e_acos.S deleted file mode 100644 index c2b31ab85e..0000000000 --- a/sysdeps/ia64/fpu/e_acos.S +++ /dev/null @@ -1,878 +0,0 @@ -.file "acos.s" - - -// Copyright (c) 2000 - 2003 Intel Corporation -// All rights reserved. -// -// Contributed 2000 by the Intel Numerics Group, Intel Corporation -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// -// * Redistributions in binary form must reproduce the above copyright -// notice, this list of conditions and the following disclaimer in the -// documentation and/or other materials provided with the distribution. -// -// * The name of Intel Corporation may not be used to endorse or promote -// products derived from this software without specific prior written -// permission. - -// 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://www.intel.com/software/products/opensource/libraries/num.htm. - -// History -//============================================================== -// 02/02/00 Initial version -// 08/17/00 New and much faster algorithm. -// 08/30/00 Avoided bank conflicts on loads, shortened |x|=1 and x=0 paths, -// fixed mfb split issue stalls. -// 05/20/02 Cleaned up namespace and sf0 syntax -// 08/02/02 New and much faster algorithm II -// 02/06/03 Reordered header: .section, .global, .proc, .align - -// Description -//========================================= -// The acos function computes the principal value of the arc cosine of x. -// acos(0) returns Pi/2, acos(1) returns 0, acos(-1) returns Pi. -// A doman error occurs for arguments not in the range [-1,+1]. -// -// The acos function returns the arc cosine in the range [0, Pi] radians. -// -// There are 8 paths: -// 1. x = +/-0.0 -// Return acos(x) = Pi/2 + x -// -// 2. 0.0 < |x| < 0.625 -// Return acos(x) = Pi/2 - x - x^3 *PolA(x^2) -// where PolA(x^2) = A3 + A5*x^2 + A7*x^4 +...+ A35*x^32 -// -// 3. 0.625 <=|x| < 1.0 -// Return acos(x) = Pi/2 - asin(x) = -// = Pi/2 - sign(x) * ( Pi/2 - sqrt(R) * PolB(R)) -// Where R = 1 - |x|, -// PolB(R) = B0 + B1*R + B2*R^2 +...+B12*R^12 -// -// sqrt(R) is approximated using the following sequence: -// y0 = (1 + eps)/sqrt(R) - initial approximation by frsqrta, -// |eps| < 2^(-8) -// Then 3 iterations are used to refine the result: -// H0 = 0.5*y0 -// S0 = R*y0 -// -// d0 = 0.5 - H0*S0 -// H1 = H0 + d0*H0 -// S1 = S0 + d0*S0 -// -// d1 = 0.5 - H1*S1 -// H2 = H1 + d0*H1 -// S2 = S1 + d0*S1 -// -// d2 = 0.5 - H2*S2 -// S3 = S3 + d2*S3 -// -// S3 approximates sqrt(R) with enough accuracy for this algorithm -// -// So, the result should be reconstracted as follows: -// acos(x) = Pi/2 - sign(x) * (Pi/2 - S3*PolB(R)) -// -// But for optimization purposes the reconstruction step is slightly -// changed: -// acos(x) = Cpi + sign(x)*PolB(R)*S2 - sign(x)*d2*S2*PolB(R) -// where Cpi = 0 if x > 0 and Cpi = Pi if x < 0 -// -// 4. |x| = 1.0 -// Return acos(1.0) = 0.0, acos(-1.0) = Pi -// -// 5. 1.0 < |x| <= +INF -// A doman error occurs for arguments not in the range [-1,+1] -// -// 6. x = [S,Q]NaN -// Return acos(x) = QNaN -// -// 7. x is denormal -// Return acos(x) = Pi/2 - x, -// -// 8. x is unnormal -// Normalize input in f8 and return to the very beginning of the function -// -// Registers used -//============================================================== -// Floating Point registers used: -// f8, input, output -// f6, f7, f9 -> f15, f32 -> f64 - -// General registers used: -// r3, r21 -> r31, r32 -> r38 - -// Predicate registers used: -// p0, p6 -> p14 - -// -// Assembly macros -//========================================= -// integer registers used -// scratch -rTblAddr = r3 - -rPiBy2Ptr = r21 -rTmpPtr3 = r22 -rDenoBound = r23 -rOne = r24 -rAbsXBits = r25 -rHalf = r26 -r0625 = r27 -rSign = r28 -rXBits = r29 -rTmpPtr2 = r30 -rTmpPtr1 = r31 - -// stacked -GR_SAVE_PFS = r32 -GR_SAVE_B0 = r33 -GR_SAVE_GP = r34 -GR_Parameter_X = r35 -GR_Parameter_Y = r36 -GR_Parameter_RESULT = r37 -GR_Parameter_TAG = r38 - -// floating point registers used -FR_X = f10 -FR_Y = f1 -FR_RESULT = f8 - - -// scratch -fXSqr = f6 -fXCube = f7 -fXQuadr = f9 -f1pX = f10 -f1mX = f11 -f1pXRcp = f12 -f1mXRcp = f13 -fH = f14 -fS = f15 -// stacked -fA3 = f32 -fB1 = f32 -fA5 = f33 -fB2 = f33 -fA7 = f34 -fPiBy2 = f34 -fA9 = f35 -fA11 = f36 -fB10 = f35 -fB11 = f36 -fA13 = f37 -fA15 = f38 -fB4 = f37 -fB5 = f38 -fA17 = f39 -fA19 = f40 -fB6 = f39 -fB7 = f40 -fA21 = f41 -fA23 = f42 -fB3 = f41 -fB8 = f42 -fA25 = f43 -fA27 = f44 -fB9 = f43 -fB12 = f44 -fA29 = f45 -fA31 = f46 -fA33 = f47 -fA35 = f48 -fBaseP = f49 -fB0 = f50 -fSignedS = f51 -fD = f52 -fHalf = f53 -fR = f54 -fCloseTo1Pol = f55 -fSignX = f56 -fDenoBound = f57 -fNormX = f58 -fX8 = f59 -fRSqr = f60 -fRQuadr = f61 -fR8 = f62 -fX16 = f63 -fCpi = f64 - -// Data tables -//============================================================== -RODATA -.align 16 -LOCAL_OBJECT_START(acos_base_range_table) -// Ai: Polynomial coefficients for the acos(x), |x| < .625000 -// Bi: Polynomial coefficients for the acos(x), |x| > .625000 -data8 0xBFDAAB56C01AE468 //A29 -data8 0x3FE1C470B76A5B2B //A31 -data8 0xBFDC5FF82A0C4205 //A33 -data8 0x3FC71FD88BFE93F0 //A35 -data8 0xB504F333F9DE6487, 0x00003FFF //B0 -data8 0xAAAAAAAAAAAAFC18, 0x00003FFC //A3 -data8 0x3F9F1C71BC4A7823 //A9 -data8 0x3F96E8BBAAB216B2 //A11 -data8 0x3F91C4CA1F9F8A98 //A13 -data8 0x3F8C9DDCEDEBE7A6 //A15 -data8 0x3F877784442B1516 //A17 -data8 0x3F859C0491802BA2 //A19 -data8 0x9999999998C88B8F, 0x00003FFB //A5 -data8 0x3F6BD7A9A660BF5E //A21 -data8 0x3F9FC1659340419D //A23 -data8 0xB6DB6DB798149BDF, 0x00003FFA //A7 -data8 0xBFB3EF18964D3ED3 //A25 -data8 0x3FCD285315542CF2 //A27 -data8 0xF15BEEEFF7D2966A, 0x00003FFB //B1 -data8 0x3EF0DDA376D10FB3 //B10 -data8 0xBEB83CAFE05EBAC9 //B11 -data8 0x3F65FFB67B513644 //B4 -data8 0x3F5032FBB86A4501 //B5 -data8 0x3F392162276C7CBA //B6 -data8 0x3F2435949FD98BDF //B7 -data8 0xD93923D7FA08341C, 0x00003FF9 //B2 -data8 0x3F802995B6D90BDB //B3 -data8 0x3F10DF86B341A63F //B8 -data8 0xC90FDAA22168C235, 0x00003FFF // Pi/2 -data8 0x3EFA3EBD6B0ECB9D //B9 -data8 0x3EDE18BA080E9098 //B12 -LOCAL_OBJECT_END(acos_base_range_table) - -.section .text -GLOBAL_LIBM_ENTRY(acos) -acos_unnormal_back: -{ .mfi - getf.d rXBits = f8 // grab bits of input value - // set p12 = 1 if x is a NaN, denormal, or zero - fclass.m p12, p0 = f8, 0xcf - adds rSign = 1, r0 -} -{ .mfi - addl rTblAddr = @ltoff(acos_base_range_table),gp - // 1 - x = 1 - |x| for positive x - fms.s1 f1mX = f1, f1, f8 - addl rHalf = 0xFFFE, r0 // exponent of 1/2 -} -;; -{ .mfi - addl r0625 = 0x3FE4, r0 // high 16 bits of 0.625 - // set p8 = 1 if x < 0 - fcmp.lt.s1 p8, p9 = f8, f0 - shl rSign = rSign, 63 // sign bit -} -{ .mfi - // point to the beginning of the table - ld8 rTblAddr = [rTblAddr] - // 1 + x = 1 - |x| for negative x - fma.s1 f1pX = f1, f1, f8 - adds rOne = 0x3FF, r0 -} -;; -{ .mfi - andcm rAbsXBits = rXBits, rSign // bits of |x| - fmerge.s fSignX = f8, f1 // signum(x) - shl r0625 = r0625, 48 // bits of DP representation of 0.625 -} -{ .mfb - setf.exp fHalf = rHalf // load A2 to FP reg - fma.s1 fXSqr = f8, f8, f0 // x^2 - // branch on special path if x is a NaN, denormal, or zero -(p12) br.cond.spnt acos_special -} -;; -{ .mfi - adds rPiBy2Ptr = 272, rTblAddr - nop.f 0 - shl rOne = rOne, 52 // bits of 1.0 -} -{ .mfi - adds rTmpPtr1 = 16, rTblAddr - nop.f 0 - // set p6 = 1 if |x| < 0.625 - cmp.lt p6, p7 = rAbsXBits, r0625 -} -;; -{ .mfi - ldfpd fA29, fA31 = [rTblAddr] // A29, fA31 - // 1 - x = 1 - |x| for positive x -(p9) fms.s1 fR = f1, f1, f8 - // point to coefficient of "near 1" polynomial -(p7) adds rTmpPtr2 = 176, rTblAddr -} -{ .mfi - ldfpd fA33, fA35 = [rTmpPtr1], 16 // A33, fA35 - // 1 + x = 1 - |x| for negative x -(p8) fma.s1 fR = f1, f1, f8 -(p6) adds rTmpPtr2 = 48, rTblAddr -} -;; -{ .mfi - ldfe fB0 = [rTmpPtr1], 16 // B0 - nop.f 0 - nop.i 0 -} -{ .mib - adds rTmpPtr3 = 16, rTmpPtr2 - // set p10 = 1 if |x| = 1.0 - cmp.eq p10, p0 = rAbsXBits, rOne - // branch on special path for |x| = 1.0 -(p10) br.cond.spnt acos_abs_1 -} -;; -{ .mfi - ldfe fA3 = [rTmpPtr2], 48 // A3 or B1 - nop.f 0 - adds rTmpPtr1 = 64, rTmpPtr3 -} -{ .mib - ldfpd fA9, fA11 = [rTmpPtr3], 16 // A9, A11 or B10, B11 - // set p11 = 1 if |x| > 1.0 - cmp.gt p11, p0 = rAbsXBits, rOne - // branch on special path for |x| > 1.0 -(p11) br.cond.spnt acos_abs_gt_1 -} -;; -{ .mfi - ldfpd fA17, fA19 = [rTmpPtr2], 16 // A17, A19 or B6, B7 - // initial approximation of 1 / sqrt(1 - x) - frsqrta.s1 f1mXRcp, p0 = f1mX - nop.i 0 -} -{ .mfi - ldfpd fA13, fA15 = [rTmpPtr3] // A13, A15 or B4, B5 - fma.s1 fXCube = fXSqr, f8, f0 // x^3 - nop.i 0 -} -;; -{ .mfi - ldfe fA5 = [rTmpPtr2], 48 // A5 or B2 - // initial approximation of 1 / sqrt(1 + x) - frsqrta.s1 f1pXRcp, p0 = f1pX - nop.i 0 -} -{ .mfi - ldfpd fA21, fA23 = [rTmpPtr1], 16 // A21, A23 or B3, B8 - fma.s1 fXQuadr = fXSqr, fXSqr, f0 // x^4 - nop.i 0 -} -;; -{ .mfi - ldfe fA7 = [rTmpPtr1] // A7 or Pi/2 - fma.s1 fRSqr = fR, fR, f0 // R^2 - nop.i 0 -} -{ .mfb - ldfpd fA25, fA27 = [rTmpPtr2] // A25, A27 or B9, B12 - nop.f 0 -(p6) br.cond.spnt acos_base_range; -} -;; - -{ .mfi - nop.m 0 -(p9) fma.s1 fH = fHalf, f1mXRcp, f0 // H0 for x > 0 - nop.i 0 -} -{ .mfi - nop.m 0 -(p9) fma.s1 fS = f1mX, f1mXRcp, f0 // S0 for x > 0 - nop.i 0 -} -;; -{ .mfi - nop.m 0 -(p8) fma.s1 fH = fHalf, f1pXRcp, f0 // H0 for x < 0 - nop.i 0 -} -{ .mfi - nop.m 0 -(p8) fma.s1 fS = f1pX, f1pXRcp, f0 // S0 for x > 0 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fRQuadr = fRSqr, fRSqr, f0 // R^4 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fB11 = fB11, fR, fB10 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fB1 = fB1, fR, fB0 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fB5 = fB5, fR, fB4 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fB7 = fB7, fR, fB6 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fB3 = fB3, fR, fB2 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fnma.s1 fD = fH, fS, fHalf // d0 = 1/2 - H0*S0 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fR8 = fRQuadr, fRQuadr, f0 // R^4 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fB9 = fB9, fR, fB8 - nop.i 0 -} -;; -{.mfi - nop.m 0 - fma.s1 fB12 = fB12, fRSqr, fB11 - nop.i 0 -} -{.mfi - nop.m 0 - fma.s1 fB7 = fB7, fRSqr, fB5 - nop.i 0 -} -;; -{.mfi - nop.m 0 - fma.s1 fB3 = fB3, fRSqr, fB1 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fH = fH, fD, fH // H1 = H0 + H0*d0 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fS = fS, fD, fS // S1 = S0 + S0*d0 - nop.i 0 -} -;; -{.mfi - nop.m 0 -(p9) fma.s1 fCpi = f1, f0, f0 // Cpi = 0 if x > 0 - nop.i 0 -} -{ .mfi - nop.m 0 -(p8) fma.s1 fCpi = fPiBy2, f1, fPiBy2 // Cpi = Pi if x < 0 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fB12 = fB12, fRSqr, fB9 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fB7 = fB7, fRQuadr, fB3 - nop.i 0 -} -;; -{.mfi - nop.m 0 - fnma.s1 fD = fH, fS, fHalf // d1 = 1/2 - H1*S1 - nop.i 0 -} -{ .mfi - nop.m 0 - fnma.s1 fSignedS = fSignX, fS, f0 // -signum(x)*S1 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fCloseTo1Pol = fB12, fR8, fB7 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fH = fH, fD, fH // H2 = H1 + H1*d1 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fS = fS, fD, fS // S2 = S1 + S1*d1 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - // -signum(x)* S2 = -signum(x)*(S1 + S1*d1) - fma.s1 fSignedS = fSignedS, fD, fSignedS - nop.i 0 -} -;; -{.mfi - nop.m 0 - fnma.s1 fD = fH, fS, fHalf // d2 = 1/2 - H2*S2 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - // Cpi + signum(x)*PolB*S2 - fnma.s1 fCpi = fSignedS, fCloseTo1Pol, fCpi - nop.i 0 -} -{ .mfi - nop.m 0 - // signum(x)*PolB * S2 - fnma.s1 fCloseTo1Pol = fSignedS, fCloseTo1Pol, f0 - nop.i 0 -} -;; -{ .mfb - nop.m 0 - // final result for 0.625 <= |x| < 1 - fma.d.s0 f8 = fCloseTo1Pol, fD, fCpi - // exit here for 0.625 <= |x| < 1 - br.ret.sptk b0 -} -;; - - -// here if |x| < 0.625 -.align 32 -acos_base_range: -{ .mfi - ldfe fCpi = [rPiBy2Ptr] // Pi/2 - fma.s1 fA33 = fA33, fXSqr, fA31 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fA15 = fA15, fXSqr, fA13 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fA29 = fA29, fXSqr, fA27 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fA25 = fA25, fXSqr, fA23 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fA21 = fA21, fXSqr, fA19 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fA9 = fA9, fXSqr, fA7 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fA5 = fA5, fXSqr, fA3 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fA35 = fA35, fXQuadr, fA33 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fA17 = fA17, fXQuadr, fA15 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fX8 = fXQuadr, fXQuadr, f0 // x^8 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fA25 = fA25, fXQuadr, fA21 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fA9 = fA9, fXQuadr, fA5 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fms.s1 fCpi = fCpi, f1, f8 // Pi/2 - x - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fA35 = fA35, fXQuadr, fA29 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fA17 = fA17, fXSqr, fA11 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fX16 = fX8, fX8, f0 // x^16 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fA35 = fA35, fX8, fA25 - nop.i 0 -} -{ .mfi - nop.m 0 - fma.s1 fA17 = fA17, fX8, fA9 - nop.i 0 -} -;; -{ .mfi - nop.m 0 - fma.s1 fBaseP = fA35, fX16, fA17 - nop.i 0 -} -;; -{ .mfb - nop.m 0 - // final result for |x| < 0.625 - fnma.d.s0 f8 = fBaseP, fXCube, fCpi - // exit here for |x| < 0.625 path - br.ret.sptk b0 -} -;; - -// here if |x| = 1 -// acos(1) = 0 -// acos(-1) = Pi -.align 32 -acos_abs_1: -{ .mfi - ldfe fPiBy2 = [rPiBy2Ptr] // Pi/2 - nop.f 0 - nop.i 0 -} -;; -.pred.rel "mutex", p8, p9 -{ .mfi - nop.m 0 - // result for x = 1.0 -(p9) fma.d.s0 f8 = f1, f0, f0 // 0.0 - nop.i 0 -} -{.mfb - nop.m 0 - // result for x = -1.0 -(p8) fma.d.s0 f8 = fPiBy2, f1, fPiBy2 // Pi - // exit here for |x| = 1.0 - br.ret.sptk b0 -} -;; - -// here if x is a NaN, denormal, or zero -.align 32 -acos_special: -{ .mfi - // point to Pi/2 - adds rPiBy2Ptr = 272, rTblAddr - // set p12 = 1 if x is a NaN - fclass.m p12, p0 = f8, 0xc3 - nop.i 0 -} -{ .mlx - nop.m 0 - // smallest positive DP normalized number - movl rDenoBound = 0x0010000000000000 -} -;; -{ .mfi - ldfe fPiBy2 = [rPiBy2Ptr] // Pi/2 - // set p13 = 1 if x = 0.0 - fclass.m p13, p0 = f8, 0x07 - nop.i 0 -} -{ .mfi - nop.m 0 - fnorm.s1 fNormX = f8 - nop.i 0 -} -;; -{ .mfb - // load smallest normal to FP reg - setf.d fDenoBound = rDenoBound - // answer if x is a NaN -(p12) fma.d.s0 f8 = f8,f1,f0 - // exit here if x is a NaN -(p12) br.ret.spnt b0 -} -;; -{ .mfi - nop.m 0 - // absolute value of normalized x - fmerge.s fNormX = f1, fNormX - nop.i 0 -} -;; -{ .mfb - nop.m 0 - // final result for x = 0 -(p13) fma.d.s0 f8 = fPiBy2, f1, f8 - // exit here if x = 0.0 -(p13) br.ret.spnt b0 -} -;; -// if we still here then x is denormal or unnormal -{ .mfi - nop.m 0 - // set p14 = 1 if normalized x is greater than or - // equal to the smallest denormalized value - // So, if p14 is set to 1 it means that we deal with - // unnormal rather than with "true" denormal - fcmp.ge.s1 p14, p0 = fNormX, fDenoBound - nop.i 0 -} -;; -{ .mfi - nop.m 0 -(p14) fcmp.eq.s0 p6, p0 = f8, f0 // Set D flag if x unnormal - nop.i 0 -} -{ .mfb - nop.m 0 - // normalize unnormal input -(p14) fnorm.s1 f8 = f8 - // return to the main path -(p14) br.cond.sptk acos_unnormal_back -} -;; -// if we still here it means that input is "true" denormal -{ .mfb - nop.m 0 - // final result if x is denormal - fms.d.s0 f8 = fPiBy2, f1, f8 // Pi/2 - x - // exit here if x is denormal - br.ret.sptk b0 -} -;; - -// here if |x| > 1.0 -// error handler should be called -.align 32 -acos_abs_gt_1: -{ .mfi - alloc r32 = ar.pfs, 0, 3, 4, 0 // get some registers - fmerge.s FR_X = f8,f8 - nop.i 0 -} -{ .mfb - mov GR_Parameter_TAG = 58 // error code - frcpa.s0 FR_RESULT, p0 = f0,f0 - // call error handler routine - br.cond.sptk __libm_error_region -} -;; -GLOBAL_LIBM_END(acos) - - - -LOCAL_LIBM_ENTRY(__libm_error_region) -.prologue -{ .mfi - add GR_Parameter_Y=-32,sp // Parameter 2 value - nop.f 0 -.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 - stfd [GR_Parameter_Y] = FR_Y,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 - stfd [GR_Parameter_X] = FR_X // STORE Parameter 1 on stack - add GR_Parameter_RESULT = 0,GR_Parameter_Y // Parameter 3 address - nop.b 0 -} -{ .mib - stfd [GR_Parameter_Y] = FR_RESULT // 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 - add GR_Parameter_RESULT = 48,sp - nop.m 0 - nop.i 0 -};; -{ .mmi - ldfd f8 = [GR_Parameter_RESULT] // Get return result off stack -.restore sp - 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 -};; - -LOCAL_LIBM_END(__libm_error_region) -.type __libm_error_support#,@function -.global __libm_error_support# |