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| author | jamborm <jamborm@138bc75d-0d04-0410-961f-82ee72b054a4> | 2017-08-14 14:33:54 +0000 |
|---|---|---|
| committer | jamborm <jamborm@138bc75d-0d04-0410-961f-82ee72b054a4> | 2017-08-14 14:33:54 +0000 |
| commit | 5321ffedee1b4e05b7fa56cab64c595516fd9533 (patch) | |
| tree | ffda4ecce65bb72e54a07d8ed2c09288fa207b43 /gcc/tree-predcom.c | |
| parent | b31856d3ac23cf3dab1e95cb96230dc81564c84a (diff) | |
| download | gcc-hsa.tar.gz | |
Merged trunk revision 251080 into the hsa branchhsa
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/hsa@251093 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-predcom.c')
| -rw-r--r-- | gcc/tree-predcom.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/gcc/tree-predcom.c b/gcc/tree-predcom.c index a4011bf4698..e7b10cb390f 100644 --- a/gcc/tree-predcom.c +++ b/gcc/tree-predcom.c @@ -1069,7 +1069,9 @@ add_ref_to_chain (chain_p chain, dref ref) chain->has_max_use_after = false; } - if (ref->distance == chain->length + /* Don't set the flag for store-store chain since there is no use. */ + if (chain->type != CT_STORE_STORE + && ref->distance == chain->length && ref->pos > root->pos) chain->has_max_use_after = true; @@ -2938,7 +2940,7 @@ prepare_finalizers_chain (struct loop *loop, chain_p chain) if (TREE_CODE (niters) != INTEGER_CST && TREE_CODE (niters) != SSA_NAME) { - niters = copy_node (niters); + niters = unshare_expr (niters); niters = force_gimple_operand (niters, &stmts, true, NULL); if (stmts) { @@ -2981,11 +2983,11 @@ prepare_finalizers (struct loop *loop, vec<chain_p> chains) if (prepare_finalizers_chain (loop, chain)) { i++; - /* We don't corrupt loop closed ssa form for store elimination - chain if eliminated stores only store loop invariant values - into memory. */ - if (!chain->inv_store_elimination) - loop_closed_ssa |= (!chain->inv_store_elimination); + /* Be conservative, assume loop closed ssa form is corrupted + by store-store chain. Though it's not always the case if + eliminated stores only store loop invariant values into + memory. */ + loop_closed_ssa = true; } else { |