[Beignet] [PATCH v2] fix builtin function "fmax"

[Homer Hsing]

if an parameter is nan, then returns another parameter.

v2: no need to test nan for integer
Signed-off-by: Homer Hsing <homer.xing at intel.com>
---
 backend/src/ocl_stdlib.tmpl.h | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/backend/src/ocl_stdlib.tmpl.h b/backend/src/ocl_stdlib.tmpl.h
index bff2b1c..d613656 100644
--- a/backend/src/ocl_stdlib.tmpl.h
+++ b/backend/src/ocl_stdlib.tmpl.h
@@ -1629,7 +1629,6 @@ INLINE_OVERLOADABLE TYPE min(TYPE a, TYPE b) { \
 INLINE_OVERLOADABLE TYPE clamp(TYPE v, TYPE l, TYPE u) { \
   return max(min(v, u), l); \
 }
-DECL_MIN_MAX_CLAMP(float)
 DECL_MIN_MAX_CLAMP(int)
 DECL_MIN_MAX_CLAMP(short)
 DECL_MIN_MAX_CLAMP(char)
@@ -1639,6 +1638,19 @@ DECL_MIN_MAX_CLAMP(unsigned char)
 DECL_MIN_MAX_CLAMP(long)
 DECL_MIN_MAX_CLAMP(ulong)
 #undef DECL_MIN_MAX_CLAMP
+INLINE_OVERLOADABLE float max(float a, float b) {
+  if(isnan(b))
+    return a;
+  return a > b ? a : b;
+}
+INLINE_OVERLOADABLE float min(float a, float b) {
+  if(isnan(b))
+    return a;
+  return a < b ? a : b;
+}
+INLINE_OVERLOADABLE float clamp(float v, float l, float u) {
+  return max(min(v, u), l);
+}
 
 #define BODY \
   if (isnan(x) || isinf(x)) { \
-- 
1.8.3.2