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

[jiangning.liu at arm dot com]

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

--- Comment #56 from Jiangning Liu <jiangning.liu at arm dot com> 2011-10-31 
07:48:25 UTC ---
(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