Implement sinpi builtin

Ported from AMD builtin library, passes piglit on Turks.

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 236647

libclc/generic/include/clc/clc.h

@@ -72,6 +72,7 @@
 #include <clc/math/round.h>
 #include <clc/math/sin.h>
 #include <clc/math/sincos.h>
+#include <clc/math/sinpi.h>
 #include <clc/math/sqrt.h>
 #include <clc/math/tan.h>
 #include <clc/math/trunc.h>

libclc/generic/include/clc/math/sinpi.h

@@ -0,0 +1,3 @@
+#define __CLC_BODY <clc/math/sinpi.inc>
+#include <clc/math/gentype.inc>
+#undef __CLC_BODY

libclc/generic/include/clc/math/sinpi.inc

@@ -0,0 +1 @@
+_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE sinpi(__CLC_GENTYPE a);

libclc/generic/lib/SOURCES

@@ -95,6 +95,7 @@ math/pown.cl
 math/sin.cl
 math/sincos.cl
 math/sincos_helpers.cl
+math/sinpi.cl
 math/tan.cl
 relational/all.cl
 relational/any.cl

libclc/generic/lib/math/sinpi.cl

@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2014 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <clc/clc.h>
+
+#include "math.h"
+#include "sincospiF_piby4.h"
+#include "../clcmacro.h"
+#ifdef cl_khr_fp64
+#include "sincosD_piby4.h"
+#endif
+
+_CLC_OVERLOAD _CLC_DEF float sinpi(float x)
+{
+    int ix = as_int(x);
+    int xsgn = ix & 0x80000000;
+    ix ^= xsgn;
+    float ax = as_float(ix);
+    int iax = (int)ax;
+    float r = ax - iax;
+    int xodd = xsgn ^ (iax & 0x1 ? 0x80000000 : 0);
+
+    // Initialize with return for +-Inf and NaN
+    int ir = 0x7fc00000;
+
+    // 2^23 <= |x| < Inf, the result is always integer
+    ir = ix < 0x7f800000 ? xsgn : ir;
+
+    // 0x1.0p-7 <= |x| < 2^23, result depends on which 0.25 interval
+
+    // r < 1.0
+    float a = 1.0f - r;
+    int e = 0;
+
+    // r <= 0.75
+    int c = r <= 0.75f;
+    a = c ? r - 0.5f : a;
+    e = c ? 1 : e;
+
+    // r < 0.5
+    c = r < 0.5f;
+    a = c ? 0.5f - r : a;
+
+    // 0 < r <= 0.25
+    c = r <= 0.25f;
+    a = c ? r : a;
+    e = c ? 0 : e;
+
+    float2 t = __libclc__sincosf_piby4(a * M_PI_F);
+    int jr = xodd ^ as_int(e ? t.hi : t.lo);
+
+    ir = ix < 0x4b000000 ? jr : ir;
+
+    return as_float(ir);
+}
+
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, sinpi, float);
+
+#ifdef cl_khr_fp64
+
+#pragma OPENCL EXTENSION cl_khr_fp64 : enable
+
+_CLC_OVERLOAD _CLC_DEF double sinpi(double x)
+{
+    long ix = as_long(x);
+    long xsgn = ix & 0x8000000000000000L;
+    ix ^= xsgn;
+    double ax = as_double(ix);
+    long iax = (long)ax;
+    double r = ax - (double)iax;
+    long xodd = xsgn ^ (iax & 0x1L ? 0x8000000000000000L : 0L);
+
+    // Initialize with return for +-Inf and NaN
+    long ir = 0x7ff8000000000000L;
+
+    // 2^23 <= |x| < Inf, the result is always integer
+    ir = ix < 0x7ff0000000000000 ? xsgn : ir;
+
+    // 0x1.0p-7 <= |x| < 2^23, result depends on which 0.25 interval
+
+    // r < 1.0
+    double a = 1.0 - r;
+    int e = 0;
+
+    //  r <= 0.75
+    int c = r <= 0.75;
+    double t = r - 0.5;
+    a = c ? t : a;
+    e = c ? 1 : e;
+
+    // r < 0.5
+    c = r < 0.5;
+    t = 0.5 - r;
+    a = c ? t : a;
+
+    // r <= 0.25
+    c = r <= 0.25;
+    a = c ? r : a;
+    e = c ? 0 : e;
+
+    double api = a * M_PI;
+    double2 sc = __libclc__sincos_piby4(api, 0.0);
+    long jr = xodd ^ as_long(e ? sc.hi : sc.lo);
+
+    ir = ax < 0x1.0p+52 ? jr : ir;
+
+    return as_double(ir);
+}
+
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, sinpi, double)
+
+#endif