From 6c1b6a5e8cd91e0e1965509ad91e627e60eb00a3 Mon Sep 17 00:00:00 2001
From: Stefan Liebler <stli@linux.ibm.com>
Date: Wed, 11 Dec 2019 15:09:20 +0100
Subject: Use GCC builtins for floor functions if desired.

This patch is using the corresponding GCC builtin for floorf, floor,
floorl and floorf128 if the USE_FUNCTION_BUILTIN macros are defined to one
in math-use-builtins.h.

This is the case for s390 if build with at least --march=z196 --mzarch.
Otherwise the generic implementation is used.  The code of the generic
implementation is not changed.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
---
 sysdeps/ieee754/flt-32/s_floorf.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'sysdeps/ieee754/flt-32')

diff --git a/sysdeps/ieee754/flt-32/s_floorf.c b/sysdeps/ieee754/flt-32/s_floorf.c
index b34d967f01..afe02a1693 100644
--- a/sysdeps/ieee754/flt-32/s_floorf.c
+++ b/sysdeps/ieee754/flt-32/s_floorf.c
@@ -24,10 +24,15 @@
 #include <math.h>
 #include <math_private.h>
 #include <libm-alias-float.h>
+#include <math-use-builtins.h>
 
 float
 __floorf(float x)
 {
+#if USE_FLOORF_BUILTIN
+  return __builtin_floorf (x);
+#else
+  /* Use generic implementation.  */
 	int32_t i0,j0;
 	uint32_t i;
 	GET_FLOAT_WORD(i0,x);
@@ -50,6 +55,7 @@ __floorf(float x)
 	}
 	SET_FLOAT_WORD(x,i0);
 	return x;
+#endif /* ! USE_FLOORF_BUILTIN  */
 }
 #ifndef __floorf
 libm_alias_float (__floor, floor)
-- 
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