* [PATCH] Fix PR81118
@ 2017-06-19 15:06 Richard Biener
0 siblings, 0 replies; only message in thread
From: Richard Biener @ 2017-06-19 15:06 UTC (permalink / raw)
To: gcc-patches
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.
Richard.
2017-06-19 Richard Biener <rguenther@suse.de>
PR middle-end/81118
* tree-cfgcleanup.c (cleanup_tree_cfg_noloop): Clear niter
estimates if we changed anything.
* gcc.dg/torture/pr81118.c: New testcase.
Index: gcc/tree-cfgcleanup.c
===================================================================
--- gcc/tree-cfgcleanup.c (revision 249358)
+++ gcc/tree-cfgcleanup.c (working copy)
@@ -839,7 +839,12 @@ cleanup_tree_cfg_noloop (void)
timevar_pop (TV_TREE_CLEANUP_CFG);
if (changed && current_loops)
- loops_state_set (LOOPS_NEED_FIXUP);
+ {
+ /* Removing edges and/or blocks may make recorded bounds refer
+ to stale GIMPLE stmts now, so clear them. */
+ free_numbers_of_iterations_estimates (cfun);
+ loops_state_set (LOOPS_NEED_FIXUP);
+ }
return changed;
}
Index: gcc/testsuite/gcc.dg/torture/pr81118.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr81118.c (nonexistent)
+++ gcc/testsuite/gcc.dg/torture/pr81118.c (working copy)
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-w" } */
+
+int a[7], b;
+int c()
+{
+ int d, e;
+ for (; d; d++)
+ if (a[d])
+ if (b)
+ return;
+ else if (d >= e)
+ return 0;
+}
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