openmp: Fix ICE on non-rectangular loop with known 0 iterations
The loops in the testcase are non-rectangular and have 0 iterations (the outer loop iterates, but the inner one never). In this case we just have the overall number of iterations computed (0), and don't have factor and other values computed. We never need to map logical iterations to the individual iterations in that case, and we were crashing during expansion of that code. 2020-11-18 Jakub Jelinek <jakub@redhat.com> PR middle-end/97862 * omp-expand.c (expand_omp_for_init_vars): Don't use the sqrt path if number of iterations is constant 0. * c-c++-common/gomp/pr97862.c: New test.
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@ -2514,7 +2514,8 @@ expand_omp_for_init_vars (struct omp_for_data *fd, gimple_stmt_iterator *gsi,
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&& (TREE_CODE (fd->loop.n2) == INTEGER_CST
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|| fd->first_inner_iterations)
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&& (optab_handler (sqrt_optab, TYPE_MODE (double_type_node))
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!= CODE_FOR_nothing))
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!= CODE_FOR_nothing)
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&& !integer_zerop (fd->loop.n2))
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{
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tree outer_n1 = fd->adjn1 ? fd->adjn1 : fd->loops[i - 1].n1;
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tree itype = TREE_TYPE (fd->loops[i].v);
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@ -0,0 +1,15 @@
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/* PR middle-end/97862 */
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void
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foo (void)
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{
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int i, j;
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#pragma omp for collapse(2)
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for (i = 0; i < 1; ++i)
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for (j = 0; j < i; ++j)
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;
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#pragma omp for collapse(2)
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for (i = 0; i < 20; i++)
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for (j = 0; j < i - 19; j += 1)
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;
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}
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