From 4e1d704243a4f3c4ded47cd0d02427bb7efef069 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torbj=C3=B6rn=20SVENSSON?= <torbjorn.svensson@foss.st.com>
Date: Tue, 25 Oct 2022 11:45:40 +0200
Subject: [PATCH] IRA: Make sure array is big enough
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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>
---
gcc/ira.cc | 1 +
1 file changed, 1 insertion(+)
diff --git a/gcc/ira.cc b/gcc/ira.cc
index 42c9cead9f8e..d28a67b2546f 100644
--- 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 ();
--
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