86 lines
2.7 KiB
Diff
86 lines
2.7 KiB
Diff
2020-03-11 Jakub Jelinek <jakub@redhat.com>
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PR tree-optimization/94130
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* tree-ssa-dse.c: Include gimplify.h.
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(increment_start_addr): If stmt has lhs, drop the lhs from call and
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set it after the call to the original value of the first argument.
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Formatting fixes.
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(decrement_count): Formatting fix.
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* gcc.c-torture/execute/pr94130.c: New test.
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--- gcc/tree-ssa-dse.c.jj 2020-03-03 11:04:46.367821907 +0100
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+++ gcc/tree-ssa-dse.c 2020-03-11 13:57:38.671845186 +0100
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@@ -38,6 +38,7 @@ along with GCC; see the file COPYING3.
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#include "tree-ssa-dse.h"
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#include "builtins.h"
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#include "gimple-fold.h"
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+#include "gimplify.h"
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/* This file implements dead store elimination.
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@@ -422,29 +423,38 @@ decrement_count (gimple *stmt, int decre
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gcc_assert (TREE_CODE (*countp) == INTEGER_CST);
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*countp = wide_int_to_tree (TREE_TYPE (*countp), (TREE_INT_CST_LOW (*countp)
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- decrement));
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-
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}
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static void
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increment_start_addr (gimple *stmt, tree *where, int increment)
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{
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+ if (tree lhs = gimple_call_lhs (stmt))
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+ if (where == gimple_call_arg_ptr (stmt, 0))
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+ {
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+ gassign *newop = gimple_build_assign (lhs, unshare_expr (*where));
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+ gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
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+ gsi_insert_after (&gsi, newop, GSI_SAME_STMT);
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+ gimple_call_set_lhs (stmt, NULL_TREE);
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+ update_stmt (stmt);
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+ }
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+
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if (TREE_CODE (*where) == SSA_NAME)
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{
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tree tem = make_ssa_name (TREE_TYPE (*where));
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gassign *newop
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- = gimple_build_assign (tem, POINTER_PLUS_EXPR, *where,
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+ = gimple_build_assign (tem, POINTER_PLUS_EXPR, *where,
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build_int_cst (sizetype, increment));
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gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
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gsi_insert_before (&gsi, newop, GSI_SAME_STMT);
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*where = tem;
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- update_stmt (gsi_stmt (gsi));
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+ update_stmt (stmt);
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return;
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}
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*where = build_fold_addr_expr (fold_build2 (MEM_REF, char_type_node,
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- *where,
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- build_int_cst (ptr_type_node,
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- increment)));
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+ *where,
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+ build_int_cst (ptr_type_node,
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+ increment)));
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}
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/* STMT is builtin call that writes bytes in bitmap ORIG, some bytes are dead
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--- gcc/testsuite/gcc.c-torture/execute/pr94130.c.jj 2020-03-11 14:01:49.431180291 +0100
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+++ gcc/testsuite/gcc.c-torture/execute/pr94130.c 2020-03-11 14:01:37.654352419 +0100
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@@ -0,0 +1,16 @@
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+/* PR tree-optimization/94130 */
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+
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+int
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+main ()
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+{
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+ int a[8];
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+ char *b = __builtin_memset (a, 0, sizeof (a));
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+ a[0] = 1;
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+ a[1] = 2;
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+ a[2] = 3;
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+ if (b != (char *) a)
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+ __builtin_abort ();
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+ else
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+ asm volatile ("" : : "g" (a) : "memory");
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+ return 0;
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+}
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