fold-const: Fix division folding with vector operands [PR94412]
The following testcase is miscompiled since 4.9, we treat unsigned vector types as if they were signed and "optimize" negations across it. 2020-03-31 Marc Glisse <marc.glisse@inria.fr> Jakub Jelinek <jakub@redhat.com> PR middle-end/94412 * fold-const.c (fold_binary_loc) <case TRUNC_DIV_EXPR>: Use ANY_INTEGRAL_TYPE_P instead of INTEGRAL_TYPE_P. * gcc.c-torture/execute/pr94412.c: New test. Co-authored-by: Marc Glisse <marc.glisse@inria.fr>
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@ -1,6 +1,15 @@
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2020-04-07 Jakub Jelinek <jakub@redhat.com>
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Backported from mainline
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2020-03-31 Marc Glisse <marc.glisse@inria.fr>
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Jakub Jelinek <jakub@redhat.com>
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PR middle-end/94412
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* fold-const.c (fold_binary_loc) <case TRUNC_DIV_EXPR>: Use
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ANY_INTEGRAL_TYPE_P instead of INTEGRAL_TYPE_P.
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2020-04-07 Jakub Jelinek <jakub@redhat.com>
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2020-03-30 Jakub Jelinek <jakub@redhat.com>
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PR target/93069
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@ -10376,11 +10376,11 @@ fold_binary_loc (location_t loc, enum tree_code code, tree type,
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/* Convert -A / -B to A / B when the type is signed and overflow is
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undefined. */
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if ((!INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_UNDEFINED (type))
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if ((!ANY_INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_UNDEFINED (type))
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&& TREE_CODE (op0) == NEGATE_EXPR
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&& negate_expr_p (op1))
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{
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if (INTEGRAL_TYPE_P (type))
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if (ANY_INTEGRAL_TYPE_P (type))
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fold_overflow_warning (("assuming signed overflow does not occur "
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"when distributing negation across "
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"division"),
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@ -10390,11 +10390,11 @@ fold_binary_loc (location_t loc, enum tree_code code, tree type,
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TREE_OPERAND (arg0, 0)),
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negate_expr (op1));
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}
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if ((!INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_UNDEFINED (type))
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if ((!ANY_INTEGRAL_TYPE_P (type) || TYPE_OVERFLOW_UNDEFINED (type))
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&& TREE_CODE (arg1) == NEGATE_EXPR
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&& negate_expr_p (op0))
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{
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if (INTEGRAL_TYPE_P (type))
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if (ANY_INTEGRAL_TYPE_P (type))
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fold_overflow_warning (("assuming signed overflow does not occur "
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"when distributing negation across "
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"division"),
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@ -1,6 +1,11 @@
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2020-04-07 Jakub Jelinek <jakub@redhat.com>
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Backported from mainline
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2020-03-31 Jakub Jelinek <jakub@redhat.com>
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PR middle-end/94412
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* gcc.c-torture/execute/pr94412.c: New test.
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2020-03-30 Jakub Jelinek <jakub@redhat.com>
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PR c++/94385
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@ -0,0 +1,28 @@
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/* PR middle-end/94412 */
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typedef unsigned V __attribute__ ((__vector_size__ (sizeof (unsigned) * 2)));
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void
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foo (V *v, V *w)
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{
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*w = -*v / 11;
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}
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void
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bar (V *v, V *w)
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{
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*w = -18 / -*v;
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}
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int
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main ()
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{
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V a = (V) { 1, 0 };
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V b = (V) { 3, __INT_MAX__ };
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V c, d;
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foo (&a, &c);
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bar (&b, &d);
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if (c[0] != -1U / 11 || c[1] != 0 || d[0] != 0 || d[1] != -18U / -__INT_MAX__)
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__builtin_abort ();
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return 0;
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}
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