[llvm-commits] [llvm-gcc-4.2] r63322 - /llvm-gcc-4.2/trunk/gcc/config/i386/i386.c

[Chris Lattner]

Author: lattner
Date: Thu Jan 29 12:16:31 2009
New Revision: 63322

URL: http://llvm.org/viewvc/llvm-project?rev=63322&view=rev
Log:
Default -fno-math-errno to on with all i386 targets.  This is after discussion
with Anton and Duncan.  -fmath-errno still works to enable it.

Modified:
    llvm-gcc-4.2/trunk/gcc/config/i386/i386.c

Modified: llvm-gcc-4.2/trunk/gcc/config/i386/i386.c
URL: http://llvm.org/viewvc/llvm-project/llvm-gcc-4.2/trunk/gcc/config/i386/i386.c?rev=63322&r1=63321&r2=63322&view=diff

==============================================================================
--- llvm-gcc-4.2/trunk/gcc/config/i386/i386.c (original)
+++ llvm-gcc-4.2/trunk/gcc/config/i386/i386.c Thu Jan 29 12:16:31 2009
@@ -2438,7 +2438,16 @@
   flag_trapping_math = 0;
   /* APPLE LOCAL end pragma fenv */
 
-  if (TARGET_MACHO)
+  /* APPLE LOCAL begin LLVM */
+  /* Enable -fno-math-errno by default, even on systems whose libm functions set
+     errno.  This is a deviation from what mainline GCC does, but it is a) good
+     for performance, b) controllable with -fmath-errno, and c) the default
+     behavior most people want anyway.  Numericists and others who play with or
+     depend on errno and can use -fmath-errno when they want it.  Because errno
+     is not set on all targets anyway, their code is inherently non-portable. */
+  if (TARGET_MACHO || 1)
+  /* APPLE LOCAL end LLVM */
+  
     /* The Darwin libraries never set errno, so we might as well
        avoid calling them when that's the only reason we would.  */
     flag_errno_math = 0;