From: Wilco Dijkstra <wilco.dijkstra@arm.com>
Date: Wed, 15 Oct 2025 16:39:54 +0000 (+0000)
Subject: math: Add builtin support for (l)lround(f)
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35807cc5cddf8de09f69f530d628a710121531b8;p=thirdparty%2Fglibc.git

math: Add builtin support for (l)lround(f)

Add builtin support for (l)lround(f) via the math-use-builtins
header mechanism.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
---

diff --git a/sysdeps/generic/math-use-builtins-llround.h b/sysdeps/generic/math-use-builtins-llround.h
new file mode 100644
index 0000000000..aa0f8c705d
--- /dev/null
+++ b/sysdeps/generic/math-use-builtins-llround.h
@@ -0,0 +1,4 @@
+#define USE_LLROUND_BUILTIN 0
+#define USE_LLROUNDF_BUILTIN 0
+#define USE_LLROUNDL_BUILTIN 0
+#define USE_LLROUNDF128_BUILTIN 0
diff --git a/sysdeps/generic/math-use-builtins-lround.h b/sysdeps/generic/math-use-builtins-lround.h
new file mode 100644
index 0000000000..b93c86ed75
--- /dev/null
+++ b/sysdeps/generic/math-use-builtins-lround.h
@@ -0,0 +1,4 @@
+#define USE_LROUND_BUILTIN 0
+#define USE_LROUNDF_BUILTIN 0
+#define USE_LROUNDL_BUILTIN 0
+#define USE_LROUNDF128_BUILTIN 0
diff --git a/sysdeps/generic/math-use-builtins.h b/sysdeps/generic/math-use-builtins.h
index b373bde439..e069b161b1 100644
--- a/sysdeps/generic/math-use-builtins.h
+++ b/sysdeps/generic/math-use-builtins.h
@@ -41,5 +41,7 @@
 #include <math-use-builtins-llrint.h>
 #include <math-use-builtins-logb.h>
 #include <math-use-builtins-ffs.h>
+#include <math-use-builtins-lround.h>
+#include <math-use-builtins-llround.h>
 
 #endif /* MATH_USE_BUILTINS_H  */
diff --git a/sysdeps/ieee754/dbl-64/s_llround.c b/sysdeps/ieee754/dbl-64/s_llround.c
index 0a07722c23..e86d3dcb67 100644
--- a/sysdeps/ieee754/dbl-64/s_llround.c
+++ b/sysdeps/ieee754/dbl-64/s_llround.c
@@ -27,10 +27,14 @@
 #include <math_private.h>
 #include <libm-alias-double.h>
 #include <fix-fp-int-convert-overflow.h>
+#include <math-use-builtins.h>
 
 long long int
 __llround (double x)
 {
+#if USE_LLROUND_BUILTIN
+  return __builtin_llround (x);
+#else
   int32_t j0;
   int64_t i0;
   long long int result;
@@ -71,6 +75,7 @@ __llround (double x)
     }
 
   return sign * result;
+#endif /* ! USE_LLROUND_BUILTIN  */
 }
 
 libm_alias_double (__llround, llround)
diff --git a/sysdeps/ieee754/dbl-64/s_lround.c b/sysdeps/ieee754/dbl-64/s_lround.c
index ba98b35b7c..e92fa5ceed 100644
--- a/sysdeps/ieee754/dbl-64/s_lround.c
+++ b/sysdeps/ieee754/dbl-64/s_lround.c
@@ -23,6 +23,7 @@
 #include <math_private.h>
 #include <libm-alias-double.h>
 #include <fix-fp-int-convert-overflow.h>
+#include <math-use-builtins.h>
 
 /* For LP64, lround is an alias for llround.  */
 #ifndef _LP64
@@ -30,6 +31,9 @@
 long int
 __lround (double x)
 {
+#if USE_LROUND_BUILTIN
+  return __builtin_lround (x);
+#else
   int32_t j0;
   int64_t i0;
   long int result;
@@ -90,6 +94,7 @@ __lround (double x)
     }
 
   return sign * result;
+#endif /* ! USE_LROUND_BUILTIN  */
 }
 
 libm_alias_double (__lround, lround)
diff --git a/sysdeps/ieee754/flt-32/s_llroundf.c b/sysdeps/ieee754/flt-32/s_llroundf.c
index e19b3072fc..bb92acbc49 100644
--- a/sysdeps/ieee754/flt-32/s_llroundf.c
+++ b/sysdeps/ieee754/flt-32/s_llroundf.c
@@ -23,11 +23,14 @@
 #include <math_private.h>
 #include <libm-alias-float.h>
 #include <fix-fp-int-convert-overflow.h>
-
+#include <math-use-builtins.h>
 
 long long int
 __llroundf (float x)
 {
+#if USE_LLROUNDF_BUILTIN
+  return __builtin_llroundf (x);
+#else
   int32_t j0;
   uint32_t i;
   long long int result;
@@ -68,6 +71,7 @@ __llroundf (float x)
     }
 
   return sign * result;
+#endif /* ! USE_LLROUNDF_BUILTIN  */
 }
 
 libm_alias_float (__llround, llround)
diff --git a/sysdeps/ieee754/flt-32/s_lroundf.c b/sysdeps/ieee754/flt-32/s_lroundf.c
index 117e98d6c9..f31c53136a 100644
--- a/sysdeps/ieee754/flt-32/s_lroundf.c
+++ b/sysdeps/ieee754/flt-32/s_lroundf.c
@@ -23,11 +23,14 @@
 #include <math_private.h>
 #include <libm-alias-float.h>
 #include <fix-fp-int-convert-overflow.h>
-
+#include <math-use-builtins.h>
 
 long int
 __lroundf (float x)
 {
+#if USE_LROUNDF_BUILTIN
+  return __builtin_lroundf (x);
+#else
   int32_t j0;
   uint32_t i;
   long int result;
@@ -68,6 +71,7 @@ __lroundf (float x)
     }
 
   return sign * result;
+#endif /* ! USE_LROUNDF_BUILTIN  */
 }
 
 libm_alias_float (__lround, lround)