59 lines
2.1 KiB
Diff
59 lines
2.1 KiB
Diff
2017-03-09 Jakub Jelinek <jakub@redhat.com>
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PR tree-optimization/79972
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* gimple-ssa-warn-alloca.c (alloca_call_type): Only call
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get_range_info on SSA_NAMEs. Formatting fixes.
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* gcc.dg/pr79972.c: New test.
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--- gcc/gimple-ssa-warn-alloca.c.jj 2017-03-07 20:04:52.000000000 +0100
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+++ gcc/gimple-ssa-warn-alloca.c 2017-03-09 12:11:41.943934314 +0100
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@@ -300,8 +300,9 @@ alloca_call_type (gimple *stmt, bool is_
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ret = alloca_type_and_limit (ALLOCA_OK);
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}
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// Check the range info if available.
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- else if (value_range_type range_type = get_range_info (len, &min, &max))
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+ else if (TREE_CODE (len) == SSA_NAME)
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{
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+ value_range_type range_type = get_range_info (len, &min, &max);
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if (range_type == VR_RANGE)
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{
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if (wi::leu_p (max, max_size))
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@@ -328,7 +329,6 @@ alloca_call_type (gimple *stmt, bool is_
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gimple *def = SSA_NAME_DEF_STMT (len);
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if (gimple_assign_cast_p (def)
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&& TYPE_UNSIGNED (TREE_TYPE (gimple_assign_rhs1 (def))))
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-
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{
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len_casted = gimple_assign_rhs1 (def);
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range_type = get_range_info (len_casted, &min, &max);
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@@ -344,8 +344,7 @@ alloca_call_type (gimple *stmt, bool is_
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else if (range_type == VR_ANTI_RANGE)
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return alloca_type_and_limit (ALLOCA_UNBOUNDED);
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else if (range_type != VR_VARYING)
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- return
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- alloca_type_and_limit (ALLOCA_BOUND_MAYBE_LARGE, max);
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+ return alloca_type_and_limit (ALLOCA_BOUND_MAYBE_LARGE, max);
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}
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}
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else if (range_type == VR_ANTI_RANGE)
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--- gcc/testsuite/gcc.dg/pr79972.c.jj 2017-03-09 12:14:24.188800592 +0100
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+++ gcc/testsuite/gcc.dg/pr79972.c 2017-03-09 12:13:38.000000000 +0100
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@@ -0,0 +1,16 @@
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+/* PR tree-optimization/79972 */
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+/* { dg-do compile } */
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+/* { dg-require-effective-target alloca } */
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+/* { dg-options "-Walloca -Wvla-larger-than=10000" } */
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+
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+int
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+f (int dim, int *b, int *c)
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+{
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+ int newcentroid[3][dim]; /* { dg-warning "unbounded use of variable-length array" } */
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+ int *a = newcentroid[2];
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+ int i, dist = 0;
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+ __builtin_memcpy (newcentroid, c, sizeof (newcentroid));
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+ for (i = 0; i < dim; i++)
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+ dist += (a[i] - b[i]) * (a[i] - b[i]);
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+ return dist;
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+}
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