AuroraMiddleware/v8
1
0
Fork 0
Code Issues 2 Pull Requests Releases Wiki Activity

[turbofan] Refactor the compare-zero folding in instruction selector.

Browse Source 
Review-Url: https://codereview.chromium.org/2475433005
Cr-Commit-Position: refs/heads/master@{#40721}
This commit is contained in:
jarin 2016-11-03 05:30:30 -07:00 committed by Commit bot
parent e7aa6f91b3
commit 9b308dcaf5
7 changed files with 87 additions and 89 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
src/compiler/arm/instruction-selector-arm.cc
View File

@ -1876,21 +1876,22 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
// Shared routine for word comparisons against zero.
void VisitWordCompareZero(InstructionSelector* selector, Node* user,
Node* value, FlagsContinuation* cont) {
while (selector->CanCover(user, value)) {
// Try to combine with comparisons against 0 by simply inverting the branch.
while (value->opcode() == IrOpcode::kWord32Equal &&
selector->CanCover(user, value)) {
Int32BinopMatcher m(value);
if (!m.right().Is(0)) break;
user = value;
value = m.left().node();
cont->Negate();
}
if (selector->CanCover(user, value)) {
switch (value->opcode()) {
case IrOpcode::kWord32Equal: {
// Combine with comparisons against 0 by simply inverting the
// continuation.
Int32BinopMatcher m(value);
if (m.right().Is(0)) {
user = value;
value = m.left().node();
cont->Negate();
continue;
}
case IrOpcode::kWord32Equal:
cont->OverwriteAndNegateIfEqual(kEqual);
return VisitWordCompare(selector, value, cont);
}
case IrOpcode::kInt32LessThan:
cont->OverwriteAndNegateIfEqual(kSignedLessThan);
return VisitWordCompare(selector, value, cont);
@ -1974,7 +1975,6 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
default:
break;
}
break;
}
if (user->opcode() == IrOpcode::kWord32Equal) {

26
src/compiler/arm64/instruction-selector-arm64.cc
View File

@ -2353,21 +2353,22 @@ void VisitFloat64Compare(InstructionSelector* selector, Node* node,
void VisitWordCompareZero(InstructionSelector* selector, Node* user,
Node* value, FlagsContinuation* cont) {
Arm64OperandGenerator g(selector);
while (selector->CanCover(user, value)) {
// Try to combine with comparisons against 0 by simply inverting the branch.
while (value->opcode() == IrOpcode::kWord32Equal &&
selector->CanCover(user, value)) {
Int32BinopMatcher m(value);
if (!m.right().Is(0)) break;
user = value;
value = m.left().node();
cont->Negate();
}
if (selector->CanCover(user, value)) {
switch (value->opcode()) {
case IrOpcode::kWord32Equal: {
// Combine with comparisons against 0 by simply inverting the
// continuation.
Int32BinopMatcher m(value);
if (m.right().Is(0)) {
user = value;
value = m.left().node();
cont->Negate();
continue;
}
case IrOpcode::kWord32Equal:
cont->OverwriteAndNegateIfEqual(kEqual);
return VisitWord32Compare(selector, value, cont);
}
case IrOpcode::kInt32LessThan:
cont->OverwriteAndNegateIfEqual(kSignedLessThan);
return VisitWord32Compare(selector, value, cont);
@ -2505,7 +2506,6 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
default:
break;
}
break;
}
// Branch could not be combined with a compare, compare against 0 and branch.

27
src/compiler/ia32/instruction-selector-ia32.cc
View File

@ -1393,22 +1393,22 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
// Shared routine for word comparison with zero.
void VisitWordCompareZero(InstructionSelector* selector, Node* user,
Node* value, FlagsContinuation* cont) {
// Try to combine the branch with a comparison.
while (selector->CanCover(user, value)) {
// Try to combine with comparisons against 0 by simply inverting the branch.
while (value->opcode() == IrOpcode::kWord32Equal &&
selector->CanCover(user, value)) {
Int32BinopMatcher m(value);
if (!m.right().Is(0)) break;
user = value;
value = m.left().node();
cont->Negate();
}
if (selector->CanCover(user, value)) {
switch (value->opcode()) {
case IrOpcode::kWord32Equal: {
// Try to combine with comparisons against 0 by simply inverting the
// continuation.
Int32BinopMatcher m(value);
if (m.right().Is(0)) {
user = value;
value = m.left().node();
cont->Negate();
continue;
}
case IrOpcode::kWord32Equal:
cont->OverwriteAndNegateIfEqual(kEqual);
return VisitWordCompare(selector, value, cont);
}
case IrOpcode::kInt32LessThan:
cont->OverwriteAndNegateIfEqual(kSignedLessThan);
return VisitWordCompare(selector, value, cont);
@ -1474,7 +1474,6 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
default:
break;
}
break;
}
// Continuation could not be combined with a compare, emit compare against 0.

1
src/compiler/instruction-selector-impl.h
View File

@ -387,6 +387,7 @@ class FlagsContinuation final {
void Overwrite(FlagsCondition condition) { condition_ = condition; }
void OverwriteAndNegateIfEqual(FlagsCondition condition) {
DCHECK(condition_ == kEqual || condition_ == kNotEqual);
bool negate = condition_ == kEqual;
condition_ = condition;
if (negate) Negate();

26
src/compiler/mips/instruction-selector-mips.cc
View File

@ -1416,21 +1416,22 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
// Shared routine for word comparisons against zero.
void VisitWordCompareZero(InstructionSelector* selector, Node* user,
Node* value, FlagsContinuation* cont) {
while (selector->CanCover(user, value)) {
// Try to combine with comparisons against 0 by simply inverting the branch.
while (value->opcode() == IrOpcode::kWord32Equal &&
selector->CanCover(user, value)) {
Int32BinopMatcher m(value);
if (!m.right().Is(0)) break;
user = value;
value = m.left().node();
cont->Negate();
}
if (selector->CanCover(user, value)) {
switch (value->opcode()) {
case IrOpcode::kWord32Equal: {
// Combine with comparisons against 0 by simply inverting the
// continuation.
Int32BinopMatcher m(value);
if (m.right().Is(0)) {
user = value;
value = m.left().node();
cont->Negate();
continue;
}
case IrOpcode::kWord32Equal:
cont->OverwriteAndNegateIfEqual(kEqual);
return VisitWordCompare(selector, value, cont);
}
case IrOpcode::kInt32LessThan:
cont->OverwriteAndNegateIfEqual(kSignedLessThan);
return VisitWordCompare(selector, value, cont);
@ -1494,7 +1495,6 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
default:
break;
}
break;
}
// Continuation could not be combined with a compare, emit compare against 0.

44
src/compiler/mips64/instruction-selector-mips64.cc
View File

@ -2037,21 +2037,30 @@ void EmitWordCompareZero(InstructionSelector* selector, Node* value,
// Shared routine for word comparisons against zero.
void VisitWordCompareZero(InstructionSelector* selector, Node* user,
Node* value, FlagsContinuation* cont) {
// Try to combine with comparisons against 0 by simply inverting the branch.
while (selector->CanCover(user, value)) {
if (value->opcode() == IrOpcode::kWord32Equal) {
Int32BinopMatcher m(value);
if (!m.right().Is(0)) break;
user = value;
value = m.left().node();
} else if (value->opcode() == IrOpcode::kWord64Equal) {
Int64BinopMatcher m(value);
if (!m.right().Is(0)) break;
user = value;
value = m.left().node();
} else {
break;
}
cont->Negate();
}
if (selector->CanCover(user, value)) {
switch (value->opcode()) {
case IrOpcode::kWord32Equal: {
// Combine with comparisons against 0 by simply inverting the
// continuation.
Int32BinopMatcher m(value);
if (m.right().Is(0)) {
user = value;
value = m.left().node();
cont->Negate();
continue;
}
case IrOpcode::kWord32Equal:
cont->OverwriteAndNegateIfEqual(kEqual);
return VisitWord32Compare(selector, value, cont);
}
case IrOpcode::kInt32LessThan:
cont->OverwriteAndNegateIfEqual(kSignedLessThan);
return VisitWord32Compare(selector, value, cont);
@ -2064,19 +2073,9 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
case IrOpcode::kUint32LessThanOrEqual:
cont->OverwriteAndNegateIfEqual(kUnsignedLessThanOrEqual);
return VisitWord32Compare(selector, value, cont);
case IrOpcode::kWord64Equal: {
// Combine with comparisons against 0 by simply inverting the
// continuation.
Int64BinopMatcher m(value);
if (m.right().Is(0)) {
user = value;
value = m.left().node();
cont->Negate();
continue;
}
case IrOpcode::kWord64Equal:
cont->OverwriteAndNegateIfEqual(kEqual);
return VisitWord64Compare(selector, value, cont);
}
case IrOpcode::kInt64LessThan:
cont->OverwriteAndNegateIfEqual(kSignedLessThan);
return VisitWord64Compare(selector, value, cont);
@ -2147,7 +2146,6 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
default:
break;
}
break;
}
// Continuation could not be combined with a compare, emit compare against 0.

26
src/compiler/x64/instruction-selector-x64.cc
View File

@ -1869,21 +1869,22 @@ void VisitFloat64Compare(InstructionSelector* selector, Node* node,
// Shared routine for word comparison against zero.
void VisitWordCompareZero(InstructionSelector* selector, Node* user,
Node* value, FlagsContinuation* cont) {
while (selector->CanCover(user, value)) {
// Try to combine with comparisons against 0 by simply inverting the branch.
while (value->opcode() == IrOpcode::kWord32Equal &&
selector->CanCover(user, value)) {
Int32BinopMatcher m(value);
if (!m.right().Is(0)) break;
user = value;
value = m.left().node();
cont->Negate();
}
if (selector->CanCover(user, value)) {
switch (value->opcode()) {
case IrOpcode::kWord32Equal: {
// Combine with comparisons against 0 by simply inverting the
// continuation.
Int32BinopMatcher m(value);
if (m.right().Is(0)) {
user = value;
value = m.left().node();
cont->Negate();
continue;
}
case IrOpcode::kWord32Equal:
cont->OverwriteAndNegateIfEqual(kEqual);
return VisitWordCompare(selector, value, kX64Cmp32, cont);
}
case IrOpcode::kInt32LessThan:
cont->OverwriteAndNegateIfEqual(kSignedLessThan);
return VisitWordCompare(selector, value, kX64Cmp32, cont);
@ -1992,7 +1993,6 @@ void VisitWordCompareZero(InstructionSelector* selector, Node* user,
default:
break;
}
break;
}
// Branch could not be combined with a compare, emit compare against 0.