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-rw-r--r--gcc/cfgloop.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/cfgloop.h b/gcc/cfgloop.h
index e868f5d..d62a415 100644
--- a/gcc/cfgloop.h
+++ b/gcc/cfgloop.h
@@ -193,6 +193,14 @@ struct GTY ((chain_next ("%h.next"))) loop {
/* Number of iteration analysis data for RTL. */
struct niter_desc *simple_loop_desc;
+
+#ifdef ENABLE_CHECKING
+ /* For sanity checking during loop fixup we record here the former
+ loop header for loops marked for removal. Note that this prevents
+ the basic-block from being collected but its index can still be
+ reused. */
+ basic_block former_header;
+#endif
};
/* Flags for state of loop structure. */