[PATCH v4 08/12] math: Add math-use-builtinds-fmax.h

[Adhemerval Zanella <adhemerval.zanella@linaro.org>]

It allows the architecture to use the builtin instead of generic
implementation.
---
 math/s_fmax_template.c                   | 27 ++++++++++++++++++++++++
 sysdeps/generic/math-use-builtins-fmax.h |  4 ++++
 sysdeps/generic/math-use-builtins.h      |  1 +
 3 files changed, 32 insertions(+)
 create mode 100644 sysdeps/generic/math-use-builtins-fmax.h

diff --git a/math/s_fmax_template.c b/math/s_fmax_template.c
index d817406f04..4417fdb283 100644
--- a/math/s_fmax_template.c
+++ b/math/s_fmax_template.c
@@ -17,10 +17,37 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <math.h>
+#include <math-use-builtins.h>
+
+#if __HAVE_FLOAT128
+# define USE_BUILTIN_F128 , _Float128 : USE_FMAXF128_BUILTIN
+# define BUILTIN_F128     , _Float128 :__builtin_fmaxf128
+#else
+# define USE_BUILTIN_F128
+# define BUILTIN_F128
+#endif
+
+#define USE_BUILTIN(X, Y)                   \
+  _Generic((X),                             \
+	   float       : USE_FMAXF_BUILTIN, \
+	   double      : USE_FMAX_BUILTIN,  \
+	   long double : USE_FMAXL_BUILTIN  \
+	   USE_BUILTIN_F128)
+
+#define BUILTIN(X, Y)                       \
+  _Generic((X),                             \
+	   float       : __builtin_fmaxf,   \
+	   double      : __builtin_fmax,    \
+	   long double : __builtin_fmaxl    \
+	   BUILTIN_F128)                    \
+  (X, Y)
 
 FLOAT
 M_DECL_FUNC (__fmax) (FLOAT x, FLOAT y)
 {
+  if (USE_BUILTIN (x, y))
+    return BUILTIN (x, y);
+
   if (isgreaterequal (x, y))
     return x;
   else if (isless (x, y))
diff --git a/sysdeps/generic/math-use-builtins-fmax.h b/sysdeps/generic/math-use-builtins-fmax.h
new file mode 100644
index 0000000000..8fc4efca6a
--- /dev/null
+++ b/sysdeps/generic/math-use-builtins-fmax.h
@@ -0,0 +1,4 @@
+#define USE_FMAX_BUILTIN 0
+#define USE_FMAXF_BUILTIN 0
+#define USE_FMAXL_BUILTIN 0
+#define USE_FMAXF128_BUILTIN 0
diff --git a/sysdeps/generic/math-use-builtins.h b/sysdeps/generic/math-use-builtins.h
index 19d2d1cf3c..e07bba242f 100644
--- a/sysdeps/generic/math-use-builtins.h
+++ b/sysdeps/generic/math-use-builtins.h
@@ -34,5 +34,6 @@
 #include <math-use-builtins-copysign.h>
 #include <math-use-builtins-sqrt.h>
 #include <math-use-builtins-fma.h>
+#include <math-use-builtins-fmax.h>
 
 #endif /* MATH_USE_BUILTINS_H  */
-- 
2.32.0