[Bug middle-end/37379] [graphite] ICE compiling aermod.f90 with -ffast-math -floop-block -O2 -fgraphite

[Sebastian Pop]

Hi,

For the first part of the bug:

> aermod.f90:14521: internal compiler error: in instantiate_scev_1, at
> tree-scalar-evolution.c:2220

the bug was introduced by an automatic rewrite arount TREE_CODE_LENGTH
http://gcc.gnu.org/viewcvs?view=rev&revision=122018

The fix avoids the gcc_assert by returning "unknown scalar evolution".

The second part of the bug was already fixed:
> aermod.f90:8312: internal compiler error: in expand_scalar_variables_expr, at
> graphite.c:3168

I will apply the patch below once it finishes regstrap.

Sebastian

Index: tree-scalar-evolution.c
===================================================================
--- tree-scalar-evolution.c	(revision 141661)
+++ tree-scalar-evolution.c	(working copy)
@@ -2213,7 +2213,9 @@ instantiate_scev_1 (basic_block instanti
       break;
     }

-  gcc_assert (!VL_EXP_CLASS_P (chrec));
+  if (VL_EXP_CLASS_P (chrec))
+    return chrec_dont_know;
+
   switch (TREE_CODE_LENGTH (TREE_CODE (chrec)))
     {
     case 3: