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X87: [x64/ia32] Deal with the non-transitivity of InstructionSelector::CanCover() when folding loads into branches.

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port 0d22e7e46a (r36482)

    original commit message:
    Sequences like:

    1: Load[kRepWord32|kTypeInt32](<address>, ...)
    2: Word32And(1, <constant>)
    3: Word32Equal(2, <another constant>)
    4: Store[(kRepWord32 : NoWriteBarrier)](<address>, <value>)
    5: Branch[None](3, ...) -> B1, B2

    where #1 and #4 refer to the same memory location, are problematic because in VisitBranch we assume that 'InstructionSelector::CanCover()' is transitive.

    What happens is that CanCover(5, 3) is true (3 is a pure op), and so are CanCover(3, 2), CanCover(2, 1), but the effect level of 5 and 3 never gets checked because 3 is a pure op. Upon VisitBranch, we

    mov [address], <value>
    test [address], <another constant>

    With this patch, it becomes:

    mov reg, [address]
    mov [address], <value>
    test reg, <another constant>

BUG=

Review-Url: https://codereview.chromium.org/2006223004
Cr-Commit-Position: refs/heads/master@{#36501}
This commit is contained in:
zhengxing.li 2016-05-25 01:57:24 -07:00 committed by Commit bot
parent eb488c1f8c
commit 4d9149e1be
1 changed files with 15 additions and 5 deletions
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20
src/compiler/x87/instruction-selector-x87.cc
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@ -27,11 +27,15 @@ class X87OperandGenerator final : public OperandGenerator {
return DefineAsRegister(node);
}
bool CanBeMemoryOperand(InstructionCode opcode, Node* node, Node* input) {
bool CanBeMemoryOperand(InstructionCode opcode, Node* node, Node* input,
int effect_level) {
if (input->opcode() != IrOpcode::kLoad ||
!selector()->CanCover(node, input)) {
return false;
}
if (effect_level != selector()->GetEffectLevel(input)) {
return false;
}
MachineRepresentation rep =
LoadRepresentationOf(input->op()).representation();
switch (opcode) {
@ -1268,18 +1272,24 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
InstructionCode narrowed_opcode = TryNarrowOpcodeSize(opcode, left, right);
int effect_level = selector->GetEffectLevel(node);
if (cont->IsBranch()) {
effect_level = selector->GetEffectLevel(
cont->true_block()->PredecessorAt(0)->control_input());
}
// If one of the two inputs is an immediate, make sure it's on the right, or
// if one of the two inputs is a memory operand, make sure it's on the left.
if ((!g.CanBeImmediate(right) && g.CanBeImmediate(left)) ||
(g.CanBeMemoryOperand(narrowed_opcode, node, right) &&
!g.CanBeMemoryOperand(narrowed_opcode, node, left))) {
(g.CanBeMemoryOperand(narrowed_opcode, node, right, effect_level) &&
!g.CanBeMemoryOperand(narrowed_opcode, node, left, effect_level))) {
if (!node->op()->HasProperty(Operator::kCommutative)) cont->Commute();
std::swap(left, right);
}
// Match immediates on right side of comparison.
if (g.CanBeImmediate(right)) {
if (g.CanBeMemoryOperand(opcode, node, left)) {
if (g.CanBeMemoryOperand(opcode, node, left, effect_level)) {
// TODO(epertoso): we should use `narrowed_opcode' here once we match
// immediates too.
return VisitCompareWithMemoryOperand(selector, opcode, left,
@ -1290,7 +1300,7 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
}
// Match memory operands on left side of comparison.
if (g.CanBeMemoryOperand(narrowed_opcode, node, left)) {
if (g.CanBeMemoryOperand(narrowed_opcode, node, left, effect_level)) {
bool needs_byte_register =
narrowed_opcode == kX87Test8 || narrowed_opcode == kX87Cmp8;
return VisitCompareWithMemoryOperand(