Implement half_rsqrt builtin v3

This is a generic implementation which just calls rsqrt.
Targets should override this if they want a faster implementation.

v2:
  - Alphabettize SOURCES

v3 (Jan Vesely):
  Limit to single precision types.

llvm-svn: 236915

3 files changed, 34 insertions, 0 deletions

diff --git a/libclc/generic/include/clc/clc.h b/libclc/generic/include/clc/clc.h
index 46135af0e63..227adced2f8 100644
--- a/libclc/generic/include/clc/clc.h
+++ b/libclc/generic/include/clc/clc.h
@@ -57,6 +57,7 @@
 #include <clc/math/fmin.h>
 #include <clc/math/fmod.h>
 #include <clc/math/fract.h>
+#include <clc/math/half_rsqrt.h>
 #include <clc/math/half_sqrt.h>
 #include <clc/math/hypot.h>
 #include <clc/math/ldexp.h>
diff --git a/libclc/generic/include/clc/math/gentype.inc b/libclc/generic/include/clc/math/gentype.inc
index c82e8082404..41eb4117194 100644
--- a/libclc/generic/include/clc/math/gentype.inc
+++ b/libclc/generic/include/clc/math/gentype.inc
@@ -40,6 +40,7 @@
 #undef __CLC_FPSIZE
 #undef __CLC_SCALAR_GENTYPE
 
+#ifndef __FLOAT_ONLY
 #ifdef cl_khr_fp64
 #define __CLC_SCALAR_GENTYPE double
 #define __CLC_FPSIZE 64
@@ -85,3 +86,4 @@
 #endif
 
 #undef __CLC_BODY
+#endif
diff --git a/libclc/generic/include/clc/math/half_rsqrt.h b/libclc/generic/include/clc/math/half_rsqrt.h
new file mode 100644
index 00000000000..0c1f5088c0f
--- /dev/null
+++ b/libclc/generic/include/clc/math/half_rsqrt.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2014,2015 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.
+ */
+
+#undef half_rsqrt
+
+#define __CLC_BODY <clc/math/unary_decl.inc>
+#define __CLC_FUNCTION half_rsqrt
+#define __FLOAT_ONLY
+#include <clc/math/gentype.inc>
+#undef __FLOAT_ONLY
+#undef __CLC_BODY
+#undef __CLC_FUNCTION