Use GCC builtins for lrint functions if desired.

This patch is using the corresponding GCC builtin for lrintf, lrint,
lrintl and lrintf128 if the USE_FUNCTION_BUILTIN macros are defined to one
in math-use-builtins-function.h.

Co-Authored-By: Xi Ruoyao <xry111@xry111.site>

6 files changed, 43 insertions, 17 deletions

diff --git a/sysdeps/generic/math-use-builtins-lrint.h b/sysdeps/generic/math-use-builtins-lrint.h
new file mode 100644
index 0000000000..e80418be9e
--- /dev/null
+++ b/sysdeps/generic/math-use-builtins-lrint.h
@@ -0,0 +1,4 @@
+#define USE_LRINT_BUILTIN 0
+#define USE_LRINTF_BUILTIN 0
+#define USE_LRINTL_BUILTIN 0
+#define USE_LRINTF128_BUILTIN 0
diff --git a/sysdeps/generic/math-use-builtins.h b/sysdeps/generic/math-use-builtins.h
index 6bd424d900..3acec1d538 100644
--- a/sysdeps/generic/math-use-builtins.h
+++ b/sysdeps/generic/math-use-builtins.h
@@ -37,5 +37,6 @@
 #include <math-use-builtins-fmax.h>
 #include <math-use-builtins-fmin.h>
 #include <math-use-builtins-fabs.h>
+#include <math-use-builtins-lrint.h>
 
 #endif /* MATH_USE_BUILTINS_H  */
diff --git a/sysdeps/ieee754/dbl-64/s_lrint.c b/sysdeps/ieee754/dbl-64/s_lrint.c
index d4272916cd..24385038ef 100644
--- a/sysdeps/ieee754/dbl-64/s_lrint.c
+++ b/sysdeps/ieee754/dbl-64/s_lrint.c
@@ -25,17 +25,22 @@
 #include <math_private.h>
 #include <libm-alias-double.h>
 #include <fix-fp-int-convert-overflow.h>
-
-static const double two52[2] =
-{
-  4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
- -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
-};
+#include <math-use-builtins.h>
 
 
 long int
 __lrint (double x)
 {
+#if USE_LRINT_BUILTIN
+  return __builtin_lrint (x);
+#else
+  /* Use generic implementation.  */
+  static const double two52[2] =
+  {
+    4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
+   -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
+  };
+
   int32_t j0;
   uint32_t i0, i1;
   double w;
@@ -119,6 +124,7 @@ __lrint (double x)
     }
 
   return sx ? -result : result;
+#endif /* ! USE_LRINT_BUILTIN  */
 }
 
 libm_alias_double (__lrint, lrint)
diff --git a/sysdeps/ieee754/float128/float128_private.h b/sysdeps/ieee754/float128/float128_private.h
index f9655df0df..a452ced89a 100644
--- a/sysdeps/ieee754/float128/float128_private.h
+++ b/sysdeps/ieee754/float128/float128_private.h
@@ -161,6 +161,8 @@
 #define USE_COPYSIGNL_BUILTIN USE_COPYSIGNF128_BUILTIN
 #undef USE_FMAL_BUILTIN
 #define USE_FMAL_BUILTIN USE_FMAF128_BUILTIN
+#undef USE_LRINTL_BUILTIN
+#define USE_LRINTL_BUILTIN USE_LRINTF128_BUILTIN
 
 /* IEEE function renames.  */
 #define __ieee754_acoshl __ieee754_acoshf128
diff --git a/sysdeps/ieee754/flt-32/s_lrintf.c b/sysdeps/ieee754/flt-32/s_lrintf.c
index 7438b272b2..50d044dd8d 100644
--- a/sysdeps/ieee754/flt-32/s_lrintf.c
+++ b/sysdeps/ieee754/flt-32/s_lrintf.c
@@ -25,17 +25,22 @@
 #include <math_private.h>
 #include <libm-alias-float.h>
 #include <fix-fp-int-convert-overflow.h>
-
-static const float two23[2] =
-{
-  8.3886080000e+06, /* 0x4B000000 */
- -8.3886080000e+06, /* 0xCB000000 */
-};
+#include <math-use-builtins.h>
 
 
 long int
 __lrintf (float x)
 {
+#if USE_LRINTF_BUILTIN
+  return __builtin_lrintf (x);
+#else
+  /* Use generic implementation.  */
+  static const float two23[2] =
+  {
+    8.3886080000e+06, /* 0x4B000000 */
+   -8.3886080000e+06, /* 0xCB000000 */
+  };
+
   int32_t j0;
   uint32_t i0;
   float w;
@@ -82,6 +87,7 @@ __lrintf (float x)
     }
 
   return sx ? -result : result;
+#endif /* ! USE_LRINTF_BUILTIN  */
 }
 
 libm_alias_float (__lrint, lrint)
diff --git a/sysdeps/ieee754/ldbl-128/s_lrintl.c b/sysdeps/ieee754/ldbl-128/s_lrintl.c
index e8ec02dc6f..ecb604a650 100644
--- a/sysdeps/ieee754/ldbl-128/s_lrintl.c
+++ b/sysdeps/ieee754/ldbl-128/s_lrintl.c
@@ -24,16 +24,22 @@
 #include <math_private.h>
 #include <libm-alias-ldouble.h>
 #include <fix-fp-int-convert-overflow.h>
+#include <math-use-builtins.h>
 
-static const _Float128 two112[2] =
-{
-  L(5.19229685853482762853049632922009600E+33), /* 0x406F000000000000, 0 */
- L(-5.19229685853482762853049632922009600E+33)  /* 0xC06F000000000000, 0 */
-};
 
 long int
 __lrintl (_Float128 x)
 {
+#if USE_LRINTL_BUILTIN
+  return __builtin_lrintl (x);
+#else
+  /* Use generic implementation. */
+  static const _Float128 two112[2] =
+  {
+    L(5.19229685853482762853049632922009600E+33), /* 0x406F000000000000, 0 */
+   L(-5.19229685853482762853049632922009600E+33)  /* 0xC06F000000000000, 0 */
+  };
+
   int32_t j0;
   uint64_t i0,i1;
   _Float128 w;
@@ -131,6 +137,7 @@ __lrintl (_Float128 x)
     }
 
   return sx ? -result : result;
+#endif /* ! USE_LRINTL_BUILTIN  */
 }
 
 libm_alias_ldouble (__lrint, lrint)