/* Similar to standard GNU userspace, but adding -ffast-math support. */
#define GNU_USER_TARGET_MATHFILE_SPEC \
- "%{Ofast|ffast-math|funsafe-math-optimizations:%{!shared:crtfastmath.o%s}} \
+ "%{mdaz-ftz:crtfastmath.o%s;Ofast|ffast-math|funsafe-math-optimizations:%{!shared:%{!mno-daz-ftz:crtfastmath.o%s}}} \
%{mpc32:crtprec32.o%s} \
%{mpc64:crtprec64.o%s} \
%{mpc80:crtprec80.o%s}"
Target RejectNegative
Set 80387 floating-point precision to 80-bit.
+mdaz-ftz
+Target
+Set the FTZ and DAZ Flags.
+
mpreferred-stack-boundary=
Target RejectNegative Joined UInteger Var(ix86_preferred_stack_boundary_arg)
Attempt to keep stack aligned to this power of 2.
-m96bit-long-double -mlong-double-64 -mlong-double-80 -mlong-double-128 @gol
-mregparm=@var{num} -msseregparm @gol
-mveclibabi=@var{type} -mvect8-ret-in-mem @gol
--mpc32 -mpc64 -mpc80 -mstackrealign @gol
+-mpc32 -mpc64 -mpc80 -mdaz-ftz -mstackrealign @gol
-momit-leaf-frame-pointer -mno-red-zone -mno-tls-direct-seg-refs @gol
-mcmodel=@var{code-model} -mabi=@var{name} -maddress-mode=@var{mode} @gol
-m32 -m64 -mx32 -m16 -miamcu -mlarge-data-threshold=@var{num} @gol
loss of accuracy, typically through so-called ``catastrophic cancellation'',
when this option is used to set the precision to less than extended precision.
+@item -mdaz-ftz
+@opindex mdaz-ftz
+
+The flush-to-zero (FTZ) and denormals-are-zero (DAZ) flags in the MXCSR register
+are used to control floating-point calculations.SSE and AVX instructions
+including scalar and vector instructions could benefit from enabling the FTZ
+and DAZ flags when @option{-mdaz-ftz} is specified. Don't set FTZ/DAZ flags
+when @option{-mno-daz-ftz} or @option{-shared} is specified, @option{-mdaz-ftz}
+will set FTZ/DAZ flags even with @option{-shared}.
+
@item -mstackrealign
@opindex mstackrealign
Realign the stack at entry. On the x86, the @option{-mstackrealign}