+1999-09-15 Brad Lucier <lucier@math.purdue.edu>
+
+ * toplev.c: Allow -f[no-]math-errno to set (clear) flag_errno_math
+ * invoke.texi: Document this change.
+
Wed Sep 15 17:56:00 1999 Richard Henderson <rth@cygnus.com>
* emit-rtl.c (free_emit_status): Don't check DECL_DEFER_OUTPUT.
-falign-jumps=@var{n} -fbranch-probabilities
-fcaller-saves -fcse-follow-jumps -fcse-skip-blocks
-fdelayed-branch -fexpensive-optimizations
--ffast-math -ffloat-store -fforce-addr -fforce-mem
+-ffast-math -ffloat-store -fforce-addr -fforce-mem -fno-math-errno
-fdata-sections -ffunction-sections -fgcse
-finline-functions -finline-limit=@var{n} -fkeep-inline-functions
-fmove-all-movables -fno-default-inline -fno-defer-pop
it can result in incorrect output for programs which depend on
an exact implementation of IEEE or ANSI rules/specifications for
math functions.
+
+@item -fno-math-errno
+Do not set ERRNO after calling math functions that are executed
+with a single instruction, e.g., sqrt. A program that relies on
+IEEE exceptions for math error handling may want to use this flag
+for speed while maintaining IEEE arithmetic compatibility.
+
+The default is @samp{-fmath-errno}. The @samp{-ffast-math} option
+sets @samp{-fno-math-errno}.
@end table
@c following causes underfulls.. they don't look great, but we deal.
{"ident", &flag_no_ident, 0,
"Process #ident directives"},
{ "peephole2", &flag_peephole2, 1,
- "Enables an rtl peephole pass run before sched2" }
+ "Enables an rtl peephole pass run before sched2" },
+ {"math-errno", &flag_errno_math, 1,
+ "Set errno after built-in math functions"}
};
#define NUM_ELEM(a) (sizeof (a) / sizeof ((a)[0]))