On ARM, make GCC generate code which uses our library fabs, fabsf,

and fabsl calls, instead of inlining its builtins implemented with
__gedf2 & __negdf2 softfloat calls which is wrong and actually
slower.

Looked over by miod@.  Also kettenis@ noted, that GCC4 has this fixed.

1 files changed, 15 insertions, 0 deletions

diff --git a/gnu/usr.bin/gcc/gcc/builtins.def b/gnu/usr.bin/gcc/gcc/builtins.def
index 39279a1e514..e8bef49bdd0 100644
--- a/gnu/usr.bin/gcc/gcc/builtins.def
+++ b/gnu/usr.bin/gcc/gcc/builtins.def
@@ -159,6 +159,20 @@ DEF_LIB_ALWAYS_BUILTIN(BUILT_IN_LABS,
 		       "__builtin_labs",
 		       BT_FN_LONG_LONG)
 
+#ifdef	__arm__
+DEF_FALLBACK_BUILTIN(BUILT_IN_FABS,
+		     "__builtin_fabs",
+		     BT_FN_DOUBLE_DOUBLE,
+		     ATTR_CONST_NOTHROW_LIST)
+DEF_FALLBACK_BUILTIN(BUILT_IN_FABSF,
+		     "__builtin_fabsf",
+		     BT_FN_FLOAT_FLOAT,
+		     ATTR_CONST_NOTHROW_LIST)
+DEF_FALLBACK_BUILTIN(BUILT_IN_FABSL,
+		     "__builtin_fabsl",
+		     BT_FN_LONG_DOUBLE_LONG_DOUBLE,
+		     ATTR_CONST_NOTHROW_LIST)
+#else	/* __arm__ */
 DEF_LIB_ALWAYS_BUILTIN(BUILT_IN_FABS,
 		       "__builtin_fabs",
 		       BT_FN_DOUBLE_DOUBLE)
@@ -168,6 +182,7 @@ DEF_LIB_ALWAYS_BUILTIN(BUILT_IN_FABSF,
 DEF_LIB_ALWAYS_BUILTIN(BUILT_IN_FABSL,
 		       "__builtin_fabsl",
 		       BT_FN_LONG_DOUBLE_LONG_DOUBLE)
+#endif	/* __arm__ */
 
 DEF_C99_BUILTIN(BUILT_IN_LLABS,
 		"__builtin_llabs",