65 lines
1.7 KiB
Diff
65 lines
1.7 KiB
Diff
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This backport contains 1 patch from gcc main stream tree.
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The commit id of these patchs list as following in the order of time.
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2686de5617bfb572343933be2883e8274c9735b5
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0001-tree-optimization-97760-reduction-paths-with-unhandl.patch
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diff --git a/gcc/testsuite/gcc.dg/vect/pr97760.c b/gcc/testsuite/gcc.dg/vect/pr97760.c
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new file mode 100644
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index 00000000000..da5ac937a43
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--- /dev/null
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+++ b/gcc/testsuite/gcc.dg/vect/pr97760.c
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@@ -0,0 +1,26 @@
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+#include "tree-vect.h"
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+
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+int b=1;
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+static int *g = &b;
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+
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+void __attribute__((noipa))
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+h (unsigned int n)
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+{
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+ int i = 3;
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+ int f = 3;
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+ for (; f <= 50; f += 4) {
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+ i += 4;
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+ *g = i;
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+ i += n;
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+ }
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+}
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+
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+int main ()
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+{
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+ check_vect ();
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+
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+ h (9);
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+ if (*g != 150 || b != 150)
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+ __builtin_abort ();
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+ return 0;
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+}
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diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
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index 977633a3ce3..39b7319e825 100644
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--- a/gcc/tree-vect-loop.c
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+++ b/gcc/tree-vect-loop.c
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@@ -3326,14 +3326,17 @@ pop:
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fail = true;
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break;
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}
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- /* Check there's only a single stmt the op is used on inside
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- of the loop. */
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+ /* Check there's only a single stmt the op is used on. For the
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+ not value-changing tail and the last stmt allow out-of-loop uses.
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+ ??? We could relax this and handle arbitrary live stmts by
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+ forcing a scalar epilogue for example. */
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imm_use_iterator imm_iter;
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gimple *op_use_stmt;
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unsigned cnt = 0;
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FOR_EACH_IMM_USE_STMT (op_use_stmt, imm_iter, op)
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if (!is_gimple_debug (op_use_stmt)
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- && flow_bb_inside_loop_p (loop, gimple_bb (op_use_stmt)))
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+ && (*code != ERROR_MARK
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+ || flow_bb_inside_loop_p (loop, gimple_bb (op_use_stmt))))
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{
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/* We want to allow x + x but not x < 1 ? x : 2. */
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if (is_gimple_assign (op_use_stmt)
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