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i386.c (insn_is_function_arg): Add check on CALL instruction.

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* config/i386/i386.c (insn_is_function_arg) : Add check on CALL
        instruction.
        (ix86_dependencies_evaluation_hook): Insert dependencies in all
        predecessors of call block for non-trivial region avoiding creation
        of loop-carried dependency to avoid cross-block motion of HW registers.

From-SVN: r192842
This commit is contained in:
Yuri Rumyantsev 2012-10-26 12:07:58 +00:00 committed by Kirill Yukhin
parent 9037dcc6ad
commit 39aada703b
2 changed files with 30 additions and 11 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2012-10-23 Yuri Rumyantsev <ysrumyan@gmail.com>
* config/i386/i386.c (insn_is_function_arg) : Add check on CALL
instruction.
(ix86_dependencies_evaluation_hook): Insert dependencies in all
predecessors of call block for non-trivial region avoiding creation
of loop-carried dependency to avoid cross-block motion of HW registers.
2012-10-26 Richard Biener <rguenther@suse.de>
PR middle-end/54824

33
gcc/config/i386/i386.c
View File

@ -24454,6 +24454,9 @@ insn_is_function_arg (rtx insn, bool* is_spilled)
if (!NONDEBUG_INSN_P (insn))
return false;
/* Call instructions are not movable, ignore it. */
if (CALL_P (insn))
return false;
insn = PATTERN (insn);
if (GET_CODE (insn) == PARALLEL)
insn = XVECEXP (insn, 0, 0);
@ -24586,18 +24589,26 @@ ix86_dependencies_evaluation_hook (rtx head, rtx tail)
first_arg = add_parameter_dependencies (insn, head);
if (first_arg)
{
/* Check if first argument has dependee out of its home block. */
sd_iterator_def sd_it1;
dep_t dep1;
FOR_EACH_DEP (first_arg, SD_LIST_BACK, sd_it1, dep1)
/* Add dependee for first argument to predecessors if only
region contains more than one block. */
basic_block bb = BLOCK_FOR_INSN (insn);
int rgn = CONTAINING_RGN (bb->index);
int nr_blks = RGN_NR_BLOCKS (rgn);
/* Skip trivial regions and region head blocks that can have
predecessors outside of region. */
if (nr_blks > 1 && BLOCK_TO_BB (bb->index) != 0)
{
rtx dee;
dee = DEP_PRO (dep1);
if (!NONDEBUG_INSN_P (dee))
continue;
if (BLOCK_FOR_INSN (dee) != BLOCK_FOR_INSN (first_arg))
/* Must add dependee for first argument in dee's block. */
add_dependee_for_func_arg (first_arg, BLOCK_FOR_INSN (dee));
edge e;
edge_iterator ei;
/* Assume that region is SCC, i.e. all immediate predecessors
of non-head block are in the same region. */
FOR_EACH_EDGE (e, ei, bb->preds)
{
/* Avoid creating of loop-carried dependencies through
using topological odering in region. */
if (BLOCK_TO_BB (bb->index) > BLOCK_TO_BB (e->src->index))
add_dependee_for_func_arg (first_arg, e->src);
}
}
insn = first_arg;
}