IRA: Make sure array is big enough

In commit 081c96621da, the call to resize_reg_info() was moved before
the call to remove_scratches() and the latter one can increase the
number of regs and that would cause an out of bounds usage on the
reg_renumber global array.

Without this patch, the following testcase randomly fails with:
during RTL pass: ira
In file included from /src/gcc/testsuite/gcc.dg/compat/struct-by-value-5b_y.c:13:
/src/gcc/testsuite/gcc.dg/compat/struct-by-value-5b_y.c: In function 'checkgSf13':
/src/gcc/testsuite/gcc.dg/compat/fp-struct-test-by-value-y.h:28:1: internal compiler error: Segmentation fault
/src/gcc/testsuite/gcc.dg/compat/struct-by-value-5b_y.c:22:1: note: in expansion of macro 'TEST'

gcc/ChangeLog:

	* ira.cc: Resize array after reg number increased.

Co-Authored-By: Yvan ROUX <yvan.roux@foss.st.com>
Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
(cherry picked from commit 4e1d704243a4f3c4ded47cd0d02427bb7efef069)

diff --git a/gcc/ira.cc b/gcc/ira.cc
index e3b3c549120ea3e913d83347404ace23474e3843..a287026a2758a4a6af0db77debf07d4d78ff5a67 100644 (file)
--- a/gcc/ira.cc
+++ b/gcc/ira.cc
@@ -5718,6 +5718,7 @@ ira (FILE *f)
     regstat_free_ri ();
     regstat_init_n_sets_and_refs ();
     regstat_compute_ri ();
+    resize_reg_info ();
   };
 
   int max_regno_before_rm = max_reg_num ();