62 lines
1.8 KiB
Diff
62 lines
1.8 KiB
Diff
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commit 482551a79a3d3f107f6239679ee74655cfe8707e
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Author: Richard Biener <rguenther@suse.de>
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Date: Thu Aug 17 13:10:14 2023 +0200
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tree-optimization/111039 - abnormals and bit test merging
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The following guards the bit test merging code in if-combine against
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the appearance of SSA names used in abnormal PHIs.
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PR tree-optimization/111039
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* tree-ssa-ifcombine.cc (ifcombine_ifandif): Check for
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SSA_NAME_OCCURS_IN_ABNORMAL_PHI.
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* gcc.dg/pr111039.c: New testcase.
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diff --git a/gcc/testsuite/gcc.dg/pr111039.c b/gcc/testsuite/gcc.dg/pr111039.c
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new file mode 100644
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index 00000000000..bec9983b35f
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--- /dev/null
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+++ b/gcc/testsuite/gcc.dg/pr111039.c
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@@ -0,0 +1,15 @@
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+/* { dg-do compile } */
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+/* { dg-options "-O" } */
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+
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+int _setjmp ();
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+void abcd ();
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+void abcde ();
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+void compiler_corruption_function(int flags)
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+{
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+ int nowait = flags & 1048576, isexpand = flags & 8388608;
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+ abcd();
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+ _setjmp(flags);
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+ if (nowait && isexpand)
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+ flags &= 0;
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+ abcde();
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+}
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diff --git a/gcc/tree-ssa-ifcombine.cc b/gcc/tree-ssa-ifcombine.cc
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index 58e19c1508e..d5701e8c407 100644
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--- a/gcc/tree-ssa-ifcombine.cc
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+++ b/gcc/tree-ssa-ifcombine.cc
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@@ -430,6 +430,9 @@ ifcombine_ifandif (basic_block inner_cond_bb, bool inner_inv,
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{
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tree t, t2;
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+ if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name1))
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+ return false;
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+
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/* Do it. */
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gsi = gsi_for_stmt (inner_cond);
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t = fold_build2 (LSHIFT_EXPR, TREE_TYPE (name1),
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@@ -486,6 +489,10 @@ ifcombine_ifandif (basic_block inner_cond_bb, bool inner_inv,
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gimple_stmt_iterator gsi;
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tree t;
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+ if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name1)
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+ || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name2))
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+ return false;
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+
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/* Find the common name which is bit-tested. */
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if (name1 == name2)
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;
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