Implement sign() builtin

llvm-svn: 192384

libclc/generic/include/clc/clc.h

@@ -86,6 +86,9 @@
 #include <clc/shared/vload.h>
 #include <clc/shared/vstore.h>
 
+/* 6.11.4 Common Functions */
+#include <clc/common/sign.h>
+
 /* 6.11.5 Geometric Functions */
 #include <clc/geometric/cross.h>
 #include <clc/geometric/dot.h>

libclc/generic/include/clc/common/sign.h

@@ -0,0 +1,5 @@
+#define __CLC_FUNCTION sign
+#define __CLC_BODY <clc/math/unary_decl.inc>
+#include <clc/math/gentype.inc>
+#undef __CLC_FUNCTION
+#undef __CLC_BODY

libclc/generic/lib/SOURCES

@@ -1,5 +1,6 @@
 atomic/atomic_impl.ll
 convert.cl
+common/sign.cl
 geometric/cross.cl
 geometric/dot.cl
 geometric/length.cl

libclc/generic/lib/common/sign.cl

@@ -0,0 +1,27 @@
+#include <clc/clc.h>
+
+#define SIGN(TYPE, F) \
+_CLC_DEF _CLC_OVERLOAD TYPE sign(TYPE x) { \
+  if (isnan(x)) { \
+    return 0.0F;   \
+  }               \
+  if (x > 0.0F) { \
+    return 1.0F;  \
+  }               \
+  if (x < 0.0F) { \
+    return -1.0F; \
+  }               \
+  return x; /* -0.0 or +0.0 */  \
+}
+
+SIGN(float, f)
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, sign, float)
+
+#ifdef cl_khr_fp64
+
+#pragma OPENCL EXTENSION cl_khr_fp64 : enable
+
+SIGN(double, )
+_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, sign, double)
+
+#endif