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HLSL: implement [unroll] and [loop] attributes

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This adds infrastructure suitable for any front end to create SPIR-V loop
control flags.  The only current front end doing so is HLSL.

[unroll] turns into spv::LoopControlUnrollMask
[loop] turns into spv::LoopControlDontUnrollMask
no specification means spv::LoopControlMaskNone
This commit is contained in:
steve-lunarg 2017-05-02 20:14:50 -06:00
parent de1cc06c1d
commit f1709e7146
17 changed files with 334 additions and 17 deletions
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19
glslang/Include/intermediate.h
View file

@ -758,6 +758,15 @@ protected:
TType type;
};
//
// Loop control hints
//
enum TLoopControl {
ELoopControlNone,
ELoopControlUnroll,
ELoopControlDontUnroll,
};
//
// Handle for, do-while, and while loops.
//
@ -767,17 +776,25 @@ public:
body(aBody),
test(aTest),
terminal(aTerminal),
first(testFirst) { }
first(testFirst),
control(ELoopControlNone)
{ }
virtual void traverse(TIntermTraverser*);
TIntermNode* getBody() const { return body; }
TIntermTyped* getTest() const { return test; }
TIntermTyped* getTerminal() const { return terminal; }
bool testFirst() const { return first; }
void setLoopControl(TLoopControl c) { control = c; }
TLoopControl getLoopControl() const { return control; }
protected:
TIntermNode* body; // code to loop over
TIntermTyped* test; // exit condition associated with loop, could be 0 for 'for' loops
TIntermTyped* terminal; // exists for for-loops
bool first; // true for while and for, not for do-while
TLoopControl control; // loop control hint
};
//

6
glslang/MachineIndependent/Intermediate.cpp
View file

@ -1630,10 +1630,11 @@ const TIntermTyped* TIntermediate::findLValueBase(const TIntermTyped* node, bool
//
// Create while and do-while loop nodes.
//
TIntermLoop* TIntermediate::addLoop(TIntermNode* body, TIntermTyped* test, TIntermTyped* terminal, bool testFirst, const TSourceLoc& loc)
TIntermLoop* TIntermediate::addLoop(TIntermNode* body, TIntermTyped* test, TIntermTyped* terminal, bool testFirst, const TSourceLoc& loc, TLoopControl control)
{
TIntermLoop* node = new TIntermLoop(body, test, terminal, testFirst);
node->setLoc(loc);
node->setLoopControl(control);
return node;
}
@ -1641,10 +1642,11 @@ TIntermLoop* TIntermediate::addLoop(TIntermNode* body, TIntermTyped* test, TInte
//
// Create a for-loop sequence.
//
TIntermAggregate* TIntermediate::addForLoop(TIntermNode* body, TIntermNode* initializer, TIntermTyped* test, TIntermTyped* terminal, bool testFirst, const TSourceLoc& loc)
TIntermAggregate* TIntermediate::addForLoop(TIntermNode* body, TIntermNode* initializer, TIntermTyped* test, TIntermTyped* terminal, bool testFirst, const TSourceLoc& loc, TLoopControl control)
{
TIntermLoop* node = new TIntermLoop(body, test, terminal, testFirst);
node->setLoc(loc);
node->setLoopControl(control);
// make a sequence of the initializer and statement
TIntermAggregate* loopSequence = makeAggregate(initializer, loc);

4
glslang/MachineIndependent/localintermediate.h
View file

@ -283,8 +283,8 @@ public:
TIntermConstantUnion* addConstantUnion(const TString*, const TSourceLoc&, bool literal = false) const;
TIntermTyped* promoteConstantUnion(TBasicType, TIntermConstantUnion*) const;
bool parseConstTree(TIntermNode*, TConstUnionArray, TOperator, const TType&, bool singleConstantParam = false);
TIntermLoop* addLoop(TIntermNode*, TIntermTyped*, TIntermTyped*, bool testFirst, const TSourceLoc&);
TIntermAggregate* addForLoop(TIntermNode*, TIntermNode*, TIntermTyped*, TIntermTyped*, bool testFirst, const TSourceLoc&);
TIntermLoop* addLoop(TIntermNode*, TIntermTyped*, TIntermTyped*, bool testFirst, const TSourceLoc&, TLoopControl = ELoopControlNone);
TIntermAggregate* addForLoop(TIntermNode*, TIntermNode*, TIntermTyped*, TIntermTyped*, bool testFirst, const TSourceLoc&, TLoopControl = ELoopControlNone);
TIntermBranch* addBranch(TOperator, const TSourceLoc&);
TIntermBranch* addBranch(TOperator, TIntermTyped*, const TSourceLoc&);
template<typename selectorType> TIntermTyped* addSwizzle(TSwizzleSelectors<selectorType>&, const TSourceLoc&);