[libclc] Move log/log2/log10 to CLC library (#128540)

This commit also enables fp16 log, which was previously missing.

Other than that, no changes to codegen for AMDGPU/Nvidia targets.

Note that for simplicity this commit doesn't try to refactor or optimize
the implementations. Notably, each log is only implementated for scalar
types; vector types are scalarized. It doesn't look too difficult to
make the implementations suitable for vector codegen, so I'll try that
in a future commit.

There's also an unused implementation of log in clc_log_base.h, whereas
the implementation currently used by libclc targets re-uses log2 with an
additional multiplication. That should also be cleaned up as on first
inspection it looks a more optimal implementation, though it would have
to be checked against the OpenCL CTS for good measure.

Author: frasercrmck

libclc/clc/include/clc/float/definitions.h

@@ -69,8 +69,6 @@
 
 #ifdef cl_khr_fp16
 
-#if __OPENCL_VERSION__ >= 120
-
 #define HALF_DIG 3
 #define HALF_MANT_DIG 11
 #define HALF_MAX_10_EXP +4
@@ -83,6 +81,6 @@
 #define HALF_MIN 0x1.0p-14h
 #define HALF_EPSILON 0x1.0p-10h
 
-#endif
+#define M_LOG2E_H 0x1.714p+0h
 
 #endif

libclc/clc/include/clc/math/clc_log.h

@@ -0,0 +1,12 @@
+#ifndef __CLC_MATH_CLC_LOG_H__
+#define __CLC_MATH_CLC_LOG_H__
+
+#define __CLC_FUNCTION __clc_log
+#define __CLC_BODY <clc/shared/unary_decl.inc>
+
+#include <clc/math/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_MATH_CLC_LOG_H__

libclc/clc/include/clc/math/clc_log10.h

@@ -0,0 +1,12 @@
+#ifndef __CLC_MATH_CLC_LOG10_H__
+#define __CLC_MATH_CLC_LOG10_H__
+
+#define __CLC_FUNCTION __clc_log10
+#define __CLC_BODY <clc/shared/unary_decl.inc>
+
+#include <clc/math/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_MATH_CLC_LOG10_H__

libclc/clc/include/clc/math/clc_log2.h

@@ -0,0 +1,12 @@
+#ifndef __CLC_MATH_CLC_LOG2_H__
+#define __CLC_MATH_CLC_LOG2_H__
+
+#define __CLC_FUNCTION __clc_log2
+#define __CLC_BODY <clc/shared/unary_decl.inc>
+
+#include <clc/math/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_MATH_CLC_LOG2_H__

libclc/clc/lib/generic/SOURCES

@@ -23,6 +23,9 @@ math/clc_fabs.cl
 math/clc_fma.cl
 math/clc_floor.cl
 math/clc_frexp.cl
+math/clc_log.cl
+math/clc_log10.cl
+math/clc_log2.cl
 math/clc_mad.cl
 math/clc_modf.cl
 math/clc_nan.cl

libclc/clc/lib/generic/math/clc_log.cl

@@ -0,0 +1,38 @@
+#include <clc/clcmacro.h>
+#include <clc/float/definitions.h>
+#include <clc/internal/clc.h>
+#include <clc/math/clc_log2.h>
+
+/*
+ *log(x) = log2(x) * (1/log2(e))
+ */
+
+_CLC_OVERLOAD _CLC_DEF float __clc_log(float x) {
+  return __clc_log2(x) * (1.0f / M_LOG2E_F);
+}
+
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, __clc_log, float);
+
+#ifdef cl_khr_fp64
+
+#pragma OPENCL EXTENSION cl_khr_fp64 : enable
+
+_CLC_OVERLOAD _CLC_DEF double __clc_log(double x) {
+  return __clc_log2(x) * (1.0 / M_LOG2E);
+}
+
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, __clc_log, double);
+
+#endif // cl_khr_fp64
+
+#ifdef cl_khr_fp16
+
+#pragma OPENCL EXTENSION cl_khr_fp16 : enable
+
+_CLC_OVERLOAD _CLC_DEF half __clc_log(half x) {
+  return (half)__clc_log2((float)x) * (1.0h / M_LOG2E_H);
+}
+
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, half, __clc_log, half);
+
+#endif // cl_khr_fp16

libclc/clc/lib/generic/math/clc_log10.cl

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2015 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/clcmacro.h>
+#include <clc/internal/clc.h>
+#include <clc/math/tables.h>
+
+#ifdef cl_khr_fp64
+#pragma OPENCL EXTENSION cl_khr_fp64 : enable
+#endif // cl_khr_fp64
+
+#ifdef cl_khr_fp16
+#pragma OPENCL EXTENSION cl_khr_fp16 : enable
+#endif // cl_khr_fp16
+
+#define COMPILING_LOG10
+#include "clc_log_base.h"
+#undef COMPILING_LOG10
+
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, __clc_log10, float);
+
+#ifdef cl_khr_fp64
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, __clc_log10, double);
+#endif // cl_khr_fp64
+
+#ifdef cl_khr_fp16
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, half, __clc_log10, half);
+#endif // cl_khr_fp16

libclc/clc/lib/generic/math/clc_log2.cl

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2015 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/clcmacro.h>
+#include <clc/internal/clc.h>
+#include <clc/math/tables.h>
+
+#ifdef cl_khr_fp64
+#pragma OPENCL EXTENSION cl_khr_fp64 : enable
+#endif // cl_khr_fp64
+
+#ifdef cl_khr_fp16
+#pragma OPENCL EXTENSION cl_khr_fp16 : enable
+#endif // cl_khr_fp16
+
+#define COMPILING_LOG2
+#include "clc_log_base.h"
+#undef COMPILING_LOG2
+
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, __clc_log2, float);
+
+#ifdef cl_khr_fp64
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, __clc_log2, double);
+#endif // cl_khr_fp64
+
+#ifdef cl_khr_fp16
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, half, __clc_log2, half);
+#endif // cl_khr_fp16