Try to update dominance info in tree-call-cdce.c
The pass would free the dominance info after making a change, but it should be pretty easy to keep the information up-to-date when the call has no EH edges. Tested on x86_64-linux-gnu, arm-linux-gnueabi and aarch64-linux-gnu. gcc/ * tree-call-cdce.c (shrink_wrap_one_built_in_call): Try to update the dominance info; free it if we can't. (pass_call_cdce::execute): Don't free the dominance info here. From-SVN: r229916
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@ -1,3 +1,9 @@
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2015-11-07 Richard Sandiford <richard.sandiford@arm.com>
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* tree-call-cdce.c (shrink_wrap_one_built_in_call): Try to update
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the dominance info; free it if we can't.
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(pass_call_cdce::execute): Don't free the dominance info here.
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2015-11-06 Jeff Law <jeff@redhat.com>
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* tree-ssa-threadedge.c (dummy_simplify): Remove.
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@ -731,6 +731,32 @@ shrink_wrap_one_built_in_call (gcall *bi_call)
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if (nconds == 0)
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return false;
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/* The cfg we want to create looks like this:
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[guard n-1] <- guard_bb (old block)
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| \
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| [guard n-2] }
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| / \ }
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| / ... } new blocks
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| / [guard 0] }
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| / / | }
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[ call ] | <- bi_call_bb }
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| \ |
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| \ |
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| [ join ] <- join_tgt_bb (old iff call must end bb)
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possible EH edges (only if [join] is old)
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When [join] is new, the immediate dominators for these blocks are:
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1. [guard n-1]: unchanged
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2. [call]: [guard n-1]
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3. [guard m]: [guard m+1] for 0 <= m <= n-2
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4. [join]: [guard n-1]
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We punt for the more complex case case of [join] being old and
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simply free the dominance info. We also punt on postdominators,
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which aren't expected to be available at this point anyway. */
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bi_call_bb = gimple_bb (bi_call);
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/* Now find the join target bb -- split bi_call_bb if needed. */
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@ -741,6 +767,7 @@ shrink_wrap_one_built_in_call (gcall *bi_call)
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join_tgt_in_edge_from_call = find_fallthru_edge (bi_call_bb->succs);
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if (join_tgt_in_edge_from_call == NULL)
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return false;
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free_dominance_info (CDI_DOMINATORS);
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}
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else
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join_tgt_in_edge_from_call = split_block (bi_call_bb, bi_call);
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@ -820,6 +847,15 @@ shrink_wrap_one_built_in_call (gcall *bi_call)
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guard_bb_in_edge->count = guard_bb->count - bi_call_in_edge->count;
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}
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if (dom_info_available_p (CDI_DOMINATORS))
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{
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/* The split_blocks leave [guard 0] as the immediate dominator
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of [call] and [call] as the immediate dominator of [join].
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Fix them up. */
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set_immediate_dominator (CDI_DOMINATORS, bi_call_bb, guard_bb);
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set_immediate_dominator (CDI_DOMINATORS, join_tgt_bb, guard_bb);
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}
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if (dump_file && (dump_flags & TDF_DETAILS))
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{
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location_t loc;
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@ -927,7 +963,6 @@ pass_call_cdce::execute (function *fun)
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if (something_changed)
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{
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free_dominance_info (CDI_DOMINATORS);
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free_dominance_info (CDI_POST_DOMINATORS);
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/* As we introduced new control-flow we need to insert PHI-nodes
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for the call-clobbers of the remaining call. */
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