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2016-11-02 Will Schmidt <will_schmidt@vnet.ibm.com>
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Backport from trunk
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2016-10-26 Will Schmidt <will_schmidt@vnet.ibm.com>
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PR middle-end/72747
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* gimplify.c (gimplify_init_constructor): Move emit of constructor
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assignment to earlier in the if/else logic.
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* c-c++-common/pr72747-1.c: New test.
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* c-c++-common/pr72747-2.c: Likewise.
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--- gcc/gimplify.c (revision 241792)
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+++ gcc/gimplify.c (revision 241793)
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@@ -4273,24 +4273,23 @@ gimplify_init_constructor (tree *expr_p,
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if (ret == GS_ERROR)
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return GS_ERROR;
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- else if (want_value)
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+ /* If we have gimplified both sides of the initializer but have
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+ not emitted an assignment, do so now. */
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+ if (*expr_p)
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+ {
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+ tree lhs = TREE_OPERAND (*expr_p, 0);
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+ tree rhs = TREE_OPERAND (*expr_p, 1);
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+ gimple init = gimple_build_assign (lhs, rhs);
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+ gimplify_seq_add_stmt (pre_p, init);
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+ }
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+ if (want_value)
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{
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*expr_p = object;
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return GS_OK;
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}
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else
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{
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- /* If we have gimplified both sides of the initializer but have
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- not emitted an assignment, do so now. */
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- if (*expr_p)
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- {
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- tree lhs = TREE_OPERAND (*expr_p, 0);
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- tree rhs = TREE_OPERAND (*expr_p, 1);
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- gimple init = gimple_build_assign (lhs, rhs);
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- gimplify_seq_add_stmt (pre_p, init);
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- *expr_p = NULL;
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- }
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-
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+ *expr_p = NULL;
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return GS_ALL_DONE;
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}
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}
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--- gcc/testsuite/c-c++-common/pr72747-1.c (nonexistent)
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+++ gcc/testsuite/c-c++-common/pr72747-1.c (revision 241793)
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@@ -0,0 +1,16 @@
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+/* { dg-do compile } */
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+/* { dg-require-effective-target powerpc_altivec_ok } */
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+/* { dg-options "-maltivec -fdump-tree-gimple" } */
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+
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+/* PR 72747: Test that cascaded definition is happening for constant vectors. */
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+
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+#include <altivec.h>
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+
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+int main (int argc, char *argv[])
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+{
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+ __vector int v1,v2;
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+ v1 = v2 = vec_splats ((int) 42);
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+ return 0;
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+}
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+/* { dg-final { scan-tree-dump-times " v2 = { 42, 42, 42, 42 }" 1 "gimple" } } */
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+
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--- gcc/testsuite/c-c++-common/pr72747-2.c (nonexistent)
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+++ gcc/testsuite/c-c++-common/pr72747-2.c (revision 241793)
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@@ -0,0 +1,18 @@
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+/* { dg-do compile } */
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+/* { dg-require-effective-target powerpc_altivec_ok } */
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+/* { dg-options "-c -maltivec -fdump-tree-gimple" } */
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+
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+/* PR 72747: test that cascaded definition is happening for non constants. */
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+
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+void foo ()
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+{
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+ extern int i;
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+ __vector int v,w;
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+ v = w = (vector int) { i };
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+}
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+
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+int main (int argc, char *argv[])
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+{
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+ return 0;
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+}
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+/* { dg-final { scan-tree-dump-times " w = " 1 "gimple" } } */
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