80 lines
2.1 KiB
Diff
80 lines
2.1 KiB
Diff
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commit ee80f0c6ba50ebf0300fb0cfe1079a1321295749
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Author: Richard Biener <rguenther@suse.de>
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Date: Thu Oct 24 11:23:54 2019 +0000
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re PR tree-optimization/92203 (ICE in eliminate_stmt, at tree-ssa-sccvn.c:5492)
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2019-10-24 Richard Biener <rguenther@suse.de>
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PR tree-optimization/92203
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* treee-ssa-sccvn.c (eliminate_dom_walker::eliminate_stmt):
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Skip eliminating conversion stmts inserted by insertion.
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* gcc.dg/torture/pr92203.c: New testcase.
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From-SVN: r277374
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diff --git a/gcc/testsuite/gcc.dg/torture/pr92203.c b/gcc/testsuite/gcc.dg/torture/pr92203.c
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new file mode 100644
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index 00000000000..c752969d5e5
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--- /dev/null
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+++ b/gcc/testsuite/gcc.dg/torture/pr92203.c
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@@ -0,0 +1,37 @@
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+/* { dg-do compile } */
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+/* { dg-additional-options "-Wno-div-by-zero" } */
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+
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+unsigned long int rr;
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+
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+void
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+cw (int z9)
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+{
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+ int m5;
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+ unsigned long int vz = 0;
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+ long int *na;
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+
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+ if (z9 == 0)
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+ rr = 0;
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+ else
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+ {
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+ na = (long int *) &m5;
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+ for (*na = 0; *na < 1; ++*na)
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+ {
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+ na = (long int *) &vz;
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+ rr /= 0;
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+ }
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+ }
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+
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+ m5 = rr / 5;
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+ ++vz;
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+ if (vz != 0)
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+ while (z9 < 1)
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+ {
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+ if (m5 >= 0)
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+ rr += m5;
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+
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+ na = (long int *) &rr;
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+ if (*na >= 0)
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+ rr = 0;
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+ }
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+}
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diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c
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index 57331ab44dc..3872168a4ed 100644
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--- a/gcc/tree-ssa-sccvn.c
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+++ b/gcc/tree-ssa-sccvn.c
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@@ -5459,8 +5459,13 @@ eliminate_dom_walker::eliminate_stmt (basic_block b, gimple_stmt_iterator *gsi)
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/* If this is an assignment from our leader (which
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happens in the case the value-number is a constant)
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- then there is nothing to do. */
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- if (gimple_assign_single_p (stmt)
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+ then there is nothing to do. Likewise if we run into
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+ inserted code that needed a conversion because of
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+ our type-agnostic value-numbering of loads. */
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+ if ((gimple_assign_single_p (stmt)
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+ || (is_gimple_assign (stmt)
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+ && (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (stmt))
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+ || gimple_assign_rhs_code (stmt) == VIEW_CONVERT_EXPR)))
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&& sprime == gimple_assign_rhs1 (stmt))
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return;
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