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Support SameAsFirstInput policy in register allocator when inputs are paired machine registers

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BUG=
R=vegorov@google.com

Review URL: https://codereview.chromium.org//393323004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@38290 260f80e4-7a28-3924-810f-c04153c831b5
This commit is contained in:
johnmccutchan@google.com 2014-07-16 16:45:10 +00:00
parent ac094f9d20
commit 92330fbc32
1 changed files with 14 additions and 3 deletions
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17
runtime/vm/flow_graph_allocator.cc
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@ -1150,9 +1150,20 @@ void FlowGraphAllocator::ProcessOneInstruction(BlockEntryInstr* block,
// Normalize same-as-first-input output if input is specified as
// fixed register.
if (locs->out(0).IsUnallocated() &&
(locs->out(0).policy() == Location::kSameAsFirstInput) &&
(locs->in(0).IsMachineRegister())) {
locs->set_out(0, locs->in(0));
(locs->out(0).policy() == Location::kSameAsFirstInput)) {
if (locs->in(0).IsPairLocation()) {
// Pair input, pair output.
PairLocation* in_pair = locs->in(0).AsPairLocation();
ASSERT(in_pair->At(0).IsMachineRegister() ==
in_pair->At(1).IsMachineRegister());
if (in_pair->At(0).IsMachineRegister() &&
in_pair->At(1).IsMachineRegister()) {
locs->set_out(0, Location::Pair(in_pair->At(0), in_pair->At(1)));
}
} else if (locs->in(0).IsMachineRegister()) {
// Single input, single output.
locs->set_out(0, locs->in(0));
}
}
const bool output_same_as_first_input =