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authorStefan Liebler <stli@linux.ibm.com>2019-12-11 15:09:22 +0100
committerStefan Liebler <stli@linux.ibm.com>2019-12-11 15:12:17 +0100
commit1ac9c1cf87216bf9f8ac4f7c9754d025d9f2c4ae (patch)
tree8c87cea663ef68ef46470f8d96a0c0c833062428 /sysdeps/ieee754/dbl-64
parent62560ee84095274bab1050817f42e782df226a17 (diff)
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Use GCC builtins for trunc functions if desired.
This patch is using the corresponding GCC builtin for truncf, trunc,
truncl and truncf128 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>
Diffstat (limited to 'sysdeps/ieee754/dbl-64')
-rw-r--r--sysdeps/ieee754/dbl-64/s_trunc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_trunc.c b/sysdeps/ieee754/dbl-64/s_trunc.c
index 0de68ce298..c3129fea7b 100644
--- a/sysdeps/ieee754/dbl-64/s_trunc.c
+++ b/sysdeps/ieee754/dbl-64/s_trunc.c
@@ -22,11 +22,16 @@
 
 #include <math_private.h>
 #include <libm-alias-double.h>
+#include <math-use-builtins.h>
 
 
 double
 __trunc (double x)
 {
+#if USE_TRUNC_BUILTIN
+  return __builtin_trunc (x);
+#else
+  /* Use generic implementation.  */
   int64_t i0, j0;
   int64_t sx;
 
@@ -49,6 +54,7 @@ __trunc (double x)
     }
 
   return x;
+#endif /* ! USE_TRUNC_BUILTIN  */
 }
 #ifndef __trunc
 libm_alias_double (__trunc, trunc)