[Mlir-commits] [mlir] Unify handling of operations which are emitted in a deferred way (PR #97804)
llvmlistbot at llvm.org
llvmlistbot at llvm.org
Fri Jul 5 02:32:51 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-mlir-emitc
Author: Simon Camphausen (simon-camp)
<details>
<summary>Changes</summary>
---
Full diff: https://github.com/llvm/llvm-project/pull/97804.diff
1 Files Affected:
- (modified) mlir/lib/Target/Cpp/TranslateToCpp.cpp (+58-46)
``````````diff
diff --git a/mlir/lib/Target/Cpp/TranslateToCpp.cpp b/mlir/lib/Target/Cpp/TranslateToCpp.cpp
index 626638282efe1d..038220d479068c 100644
--- a/mlir/lib/Target/Cpp/TranslateToCpp.cpp
+++ b/mlir/lib/Target/Cpp/TranslateToCpp.cpp
@@ -174,6 +174,9 @@ struct CppEmitter {
/// Emit an expression as a C expression.
LogicalResult emitExpression(ExpressionOp expressionOp);
+ /// Insert the expression representing the operation into the value cache.
+ LogicalResult cacheDeferredOpResult(Operation *op);
+
/// Return the existing or a new name for a Value.
StringRef getOrCreateName(Value val);
@@ -273,6 +276,12 @@ struct CppEmitter {
};
} // namespace
+/// Determine whether expression \p op should be emitted in a deferred way.
+static bool hasDeferredEmission(Operation *op) {
+ return isa_and_nonnull<emitc::GetGlobalOp, emitc::LiteralOp,
+ emitc::SubscriptOp>(op);
+}
+
/// Determine whether expression \p expressionOp should be emitted inline, i.e.
/// as part of its user. This function recommends inlining of any expressions
/// that can be inlined unless it is used by another expression, under the
@@ -295,10 +304,10 @@ static bool shouldBeInlined(ExpressionOp expressionOp) {
Operation *user = *result.getUsers().begin();
- // Do not inline expressions used by subscript operations, since the
- // way the subscript operation translation is implemented requires that
- // variables be materialized.
- if (isa<emitc::SubscriptOp>(user))
+ // Do not inline expressions used by operations with deferred emission, since
+ // the way their translation is implemented requires that variables be
+ // materialized.
+ if (hasDeferredEmission(user))
return false;
// Do not inline expressions used by ops with the CExpression trait. If this
@@ -370,20 +379,6 @@ static LogicalResult printOperation(CppEmitter &emitter,
return emitter.emitOperand(assignOp.getValue());
}
-static LogicalResult printOperation(CppEmitter &emitter,
- emitc::GetGlobalOp op) {
- // Add name to cache so that `hasValueInScope` works.
- emitter.getOrCreateName(op.getResult());
- return success();
-}
-
-static LogicalResult printOperation(CppEmitter &emitter,
- emitc::SubscriptOp subscriptOp) {
- // Add name to cache so that `hasValueInScope` works.
- emitter.getOrCreateName(subscriptOp.getResult());
- return success();
-}
-
static LogicalResult printBinaryOperation(CppEmitter &emitter,
Operation *operation,
StringRef binaryOperator) {
@@ -621,9 +616,7 @@ static LogicalResult printOperation(CppEmitter &emitter,
if (t.getType().isIndex()) {
int64_t idx = t.getInt();
Value operand = op.getOperand(idx);
- auto literalDef =
- dyn_cast_if_present<LiteralOp>(operand.getDefiningOp());
- if (!literalDef && !emitter.hasValueInScope(operand))
+ if (!emitter.hasValueInScope(operand))
return op.emitOpError("operand ")
<< idx << "'s value not defined in scope";
os << emitter.getOrCreateName(operand);
@@ -948,8 +941,7 @@ static LogicalResult printFunctionBody(CppEmitter &emitter,
// regions.
WalkResult result =
functionOp->walk<WalkOrder::PreOrder>([&](Operation *op) -> WalkResult {
- if (isa<emitc::LiteralOp>(op) ||
- isa<emitc::ExpressionOp>(op->getParentOp()) ||
+ if (isa<emitc::ExpressionOp>(op->getParentOp()) ||
(isa<emitc::ExpressionOp>(op) &&
shouldBeInlined(cast<emitc::ExpressionOp>(op))))
return WalkResult::skip();
@@ -1001,7 +993,8 @@ static LogicalResult printFunctionBody(CppEmitter &emitter,
// trailing semicolon is handled within the printOperation function.
bool trailingSemicolon =
!isa<cf::CondBranchOp, emitc::DeclareFuncOp, emitc::ForOp,
- emitc::IfOp, emitc::LiteralOp, emitc::VerbatimOp>(op);
+ emitc::IfOp, emitc::VerbatimOp>(op) ||
+ hasDeferredEmission(&op);
if (failed(emitter.emitOperation(
op, /*trailingSemicolon=*/trailingSemicolon)))
@@ -1134,20 +1127,41 @@ std::string CppEmitter::getSubscriptName(emitc::SubscriptOp op) {
return out;
}
+LogicalResult CppEmitter::cacheDeferredOpResult(Operation *op) {
+ if (op->getNumResults() != 1)
+ return op->emitError("Adding deferred ops into value cache only works for "
+ "single result operations, got ")
+ << op->getNumResults() << " results";
+
+ Value result = op->getResult(0);
+ if (valueMapper.count(result))
+ return success();
+
+ if (auto getGlobal = dyn_cast<emitc::GetGlobalOp>(op)) {
+ valueMapper.insert(result, getGlobal.getName().str());
+ return success();
+ }
+
+ if (auto literal = dyn_cast<emitc::LiteralOp>(op)) {
+ valueMapper.insert(result, literal.getValue().str());
+ return success();
+ }
+
+ if (auto subscript = dyn_cast<emitc::SubscriptOp>(op)) {
+ valueMapper.insert(result, getSubscriptName(subscript));
+ return success();
+ }
+
+ return op->emitError("cacheDeferredOpResult not implemented");
+}
+
/// Return the existing or a new name for a Value.
StringRef CppEmitter::getOrCreateName(Value val) {
- if (auto literal = dyn_cast_if_present<emitc::LiteralOp>(val.getDefiningOp()))
- return literal.getValue();
if (!valueMapper.count(val)) {
- if (auto subscript =
- dyn_cast_if_present<emitc::SubscriptOp>(val.getDefiningOp())) {
- valueMapper.insert(val, getSubscriptName(subscript));
- } else if (auto getGlobal = dyn_cast_if_present<emitc::GetGlobalOp>(
- val.getDefiningOp())) {
- valueMapper.insert(val, getGlobal.getName().str());
- } else {
- valueMapper.insert(val, formatv("v{0}", ++valueInScopeCount.top()));
- }
+ assert(!hasDeferredEmission(val.getDefiningOp()) &&
+ "cacheDeferredOpResult should have been called on this value, "
+ "update the emitOperation function.");
+ valueMapper.insert(val, formatv("v{0}", ++valueInScopeCount.top()));
}
return *valueMapper.begin(val);
}
@@ -1341,9 +1355,6 @@ LogicalResult CppEmitter::emitOperand(Value value) {
if (expressionOp && shouldBeInlined(expressionOp))
return emitExpression(expressionOp);
- auto literalOp = dyn_cast_if_present<LiteralOp>(value.getDefiningOp());
- if (!literalOp && !hasValueInScope(value))
- return failure();
os << getOrCreateName(value);
return success();
}
@@ -1399,7 +1410,7 @@ LogicalResult CppEmitter::emitVariableAssignment(OpResult result) {
LogicalResult CppEmitter::emitVariableDeclaration(OpResult result,
bool trailingSemicolon) {
- if (isa<emitc::SubscriptOp>(result.getDefiningOp()))
+ if (hasDeferredEmission(result.getDefiningOp()))
return success();
if (hasValueInScope(result)) {
return result.getDefiningOp()->emitError(
@@ -1498,16 +1509,17 @@ LogicalResult CppEmitter::emitOperation(Operation &op, bool trailingSemicolon) {
emitc::CallOpaqueOp, emitc::CastOp, emitc::CmpOp,
emitc::ConditionalOp, emitc::ConstantOp, emitc::DeclareFuncOp,
emitc::DivOp, emitc::ExpressionOp, emitc::ForOp, emitc::FuncOp,
- emitc::GlobalOp, emitc::GetGlobalOp, emitc::IfOp,
- emitc::IncludeOp, emitc::LogicalAndOp, emitc::LogicalNotOp,
- emitc::LogicalOrOp, emitc::MulOp, emitc::RemOp, emitc::ReturnOp,
- emitc::SubOp, emitc::SubscriptOp, emitc::UnaryMinusOp,
- emitc::UnaryPlusOp, emitc::VariableOp, emitc::VerbatimOp>(
+ emitc::GlobalOp, emitc::IfOp, emitc::IncludeOp,
+ emitc::LogicalAndOp, emitc::LogicalNotOp, emitc::LogicalOrOp,
+ emitc::MulOp, emitc::RemOp, emitc::ReturnOp, emitc::SubOp,
+ emitc::UnaryMinusOp, emitc::UnaryPlusOp, emitc::VariableOp,
+ emitc::VerbatimOp>(
[&](auto op) { return printOperation(*this, op); })
// Func ops.
.Case<func::CallOp, func::FuncOp, func::ReturnOp>(
[&](auto op) { return printOperation(*this, op); })
- .Case<emitc::LiteralOp>([&](auto op) { return success(); })
+ .Case<emitc::GetGlobalOp, emitc::LiteralOp, emitc::SubscriptOp>(
+ [&](Operation *op) { return cacheDeferredOpResult(op); })
.Default([&](Operation *) {
return op.emitOpError("unable to find printer for op");
});
@@ -1515,7 +1527,7 @@ LogicalResult CppEmitter::emitOperation(Operation &op, bool trailingSemicolon) {
if (failed(status))
return failure();
- if (isa<emitc::LiteralOp, emitc::SubscriptOp, emitc::GetGlobalOp>(op))
+ if (hasDeferredEmission(&op))
return success();
if (getEmittedExpression() ||
``````````
</details>
https://github.com/llvm/llvm-project/pull/97804
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