[libclc] 268/291: Implement sin for double types

[Andreas Beckmann]

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anbe pushed a commit to branch master
in repository libclc.

commit 538329dc54b1c80fb836277763af56a77769ea4b
Author: Tom Stellard <thomas.stellard at amd.com>
Date:   Tue May 12 17:18:47 2015 +0000

    Implement sin for double types
    
    This implementation was ported from the AMD builtin library
    and has been tested with piglit, OpenCV, and the ocl conformance tests.
    
    git-svn-id: https://llvm.org/svn/llvm-project/libclc/trunk@237155 91177308-0d34-0410-b5e6-96231b3b80d8
---
 generic/lib/math/sin.cl | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/generic/lib/math/sin.cl b/generic/lib/math/sin.cl
index 50684e4..3a40749 100644
--- a/generic/lib/math/sin.cl
+++ b/generic/lib/math/sin.cl
@@ -55,14 +55,23 @@ _CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, sin, float);
 
 #pragma OPENCL EXTENSION cl_khr_fp64 : enable
 
-#define __CLC_FUNCTION __clc_sin_intrinsic
-#define __CLC_INTRINSIC "llvm.sin"
-#include <clc/math/unary_intrin.inc>
-#undef __CLC_FUNCTION
-#undef __CLC_INTRINSIC
-
 _CLC_OVERLOAD _CLC_DEF double sin(double x) {
-    return __clc_sin_intrinsic(x);
+    double y = fabs(x);
+
+    double r, rr;
+    int regn;
+
+    if (y < 0x1.0p+47)
+        __clc_remainder_piby2_medium(y, &r, &rr, &regn);
+    else
+        __clc_remainder_piby2_large(y, &r, &rr, &regn);
+
+    double2 sc = __clc_sincos_piby4(r, rr);
+
+    int2 s = as_int2(regn & 1 ? sc.hi : sc.lo);
+    s.hi ^= ((regn > 1) << 31) ^ ((x < 0.0) << 31);
+
+    return  isinf(x) | isnan(x) ? as_double(QNANBITPATT_DP64) : as_double(s);
 }
 
 _CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, sin, double);

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