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[PATCH] Fix PR82102
- From: Richard Biener <rguenther at suse dot de>
- To: gcc-patches at gcc dot gnu dot org
- Date: Tue, 5 Sep 2017 10:13:49 +0200 (CEST)
- Subject: [PATCH] Fix PR82102
- Authentication-results: sourceware.org; auth=none
The following fixes PR82102, GIMPLE_NOPs don't have a lhs so we
have to care for that case.
Tested on x86_64-unknown-linux-gnu, applied as obvious.
Richard.
2017-09-05 Richard Biener <rguenther@suse.de>
PR tree-optimization/82102
* tree-ssa-pre.c (fini_eliminate): Check if lhs is NULL.
* gcc.dg/torture/pr82102.c: New testcase.
Index: gcc/tree-ssa-pre.c
===================================================================
--- gcc/tree-ssa-pre.c (revision 251689)
+++ gcc/tree-ssa-pre.c (working copy)
@@ -4860,6 +4860,7 @@ fini_eliminate (void)
lhs = gimple_get_lhs (stmt);
if (inserted_exprs
+ && lhs
&& TREE_CODE (lhs) == SSA_NAME
&& bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (lhs)))
continue;
Index: gcc/testsuite/gcc.dg/torture/pr82102.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr82102.c (nonexistent)
+++ gcc/testsuite/gcc.dg/torture/pr82102.c (working copy)
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+
+void *a, *b;
+struct pt3_i2cbuf {
+ int num_cmds;
+} c;
+void *memcpy(void *, void *, __SIZE_TYPE__);
+void put_stop();
+void translate(struct pt3_i2cbuf *p1, int p2)
+{
+ p1->num_cmds = 0;
+ if (p2)
+ put_stop();
+}
+void pt3_i2c_master_xfer(int p1)
+{
+ translate(&c, p1);
+ memcpy(a, b, c.num_cmds);
+ for (; p1;)
+ ;
+}