[Bug rtl-optimization/38644] [4.4/4.5/4.6/4.7 Regression] Optimization flag -O1 -fschedule-insns2 causes wrong code

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38644

--- Comment #57 from Mikael Pettersson <mikpe at it dot uu.se> 2011-10-31 08:32:09 UTC ---
(In reply to comment #56)
> (In reply to comment #54)
> > I tested with GCC 4.6.2 and the patch provided by Mikael Pettersson.  It works
> > for -march=armv4t and -march=armv5t, but not for -march=armv5te:
> > 
> 
> Sebastian,
> 
> Actually you may try this,
> 
> diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
> index aed748c..8269c1a 100755
> --- a/gcc/config/arm/arm.c
> +++ b/gcc/config/arm/arm.c
> @@ -22273,6 +22273,8 @@ thumb1_expand_epilogue (void)
>    gcc_assert (amount >= 0);
>    if (amount)
>      {
> +      emit_insn (gen_blockage ());
> +
>        if (amount < 512)
>         emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
>                                GEN_INT (amount)));
> 
> Thanks,
> -Jiangning

Yeah, that should be even better than my patch.  Thanks.