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Commit 3d2391fb by John Kessenich
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GLSL/SPV: Propagaet precision qualifier from function to return value.

When a return value's type has no precision qualification (e.g., the return expression is formed from a constructor), and the formal function return type has a precision qualification, back propagate that from the return type to the type of the return value's expression.
parent 4f72970e
Showing with 67 additions and 45 deletions
Test/baseResults/310AofA.vert.out
......@@ -61,7 +61,7 @@ ERROR: node is still EOpNull!
0:49 Constant:
0:49 0.000000
0:50 Branch: Return with expression
0:50 Construct float ( temp 4-element array of 7-element array of float)
0:50 Construct float ( temp 4-element array of 7-element array of highp float)
0:50 direct index ( temp 7-element array of highp float)
0:50 'a' ( in 5-element array of 7-element array of highp float)
0:50 Constant:
......@@ -76,7 +76,7 @@ ERROR: node is still EOpNull!
0:50 Constant:
0:50 3 (const int)
0:51 Branch: Return with expression
0:51 Construct float ( temp 4-element array of 7-element array of float)
0:51 Construct float ( temp 4-element array of 7-element array of highp float)
0:51 direct index ( temp 7-element array of highp float)
0:51 'a' ( in 5-element array of 7-element array of highp float)
0:51 Constant:
......@@ -91,7 +91,7 @@ ERROR: node is still EOpNull!
0:51 Constant:
0:51 3 (const int)
0:52 Branch: Return with expression
0:52 Construct float ( temp 4-element array of 7-element array of float)
0:52 Construct float ( temp 4-element array of 7-element array of highp float)
0:52 direct index ( temp 7-element array of highp float)
0:52 'a' ( in 5-element array of 7-element array of highp float)
0:52 Constant:
......
Test/baseResults/array100.frag.out
......@@ -31,7 +31,7 @@ ERROR: node is still EOpNull!
0:9 'a' ( in 5-element array of mediump float)
0:11 Sequence
0:11 Branch: Return with expression
0:11 Construct float ( temp 4-element array of float)
0:11 Construct float ( temp 4-element array of mediump float)
0:11 direct index ( temp mediump float)
0:11 'a' ( in 5-element array of mediump float)
0:11 Constant:
......@@ -168,7 +168,7 @@ ERROR: node is still EOpNull!
0:9 'a' ( in 5-element array of mediump float)
0:11 Sequence
0:11 Branch: Return with expression
0:11 Construct float ( temp 4-element array of float)
0:11 Construct float ( temp 4-element array of mediump float)
0:11 direct index ( temp mediump float)
0:11 'a' ( in 5-element array of mediump float)
0:11 Constant:
......
Test/baseResults/spv.forwardFun.frag.out
spv.forwardFun.frag
// Module Version 10000
// Generated by (magic number): 8000a
// Id's are bound by 64
// Id's are bound by 60
Capability Shader
1: ExtInstImport "GLSL.std.450"
MemoryModel Logical GLSL450
EntryPoint Fragment 4 "main" 20 30 36 63
EntryPoint Fragment 4 "main" 20 30 36 59
ExecutionMode 4 OriginUpperLeft
Source GLSL 140
Name 4 "main"
......@@ -20,7 +20,7 @@ spv.forwardFun.frag
Name 27 "f"
Name 30 "gl_FragColor"
Name 36 "d"
Name 63 "bigColor"
Name 59 "bigColor"
Decorate 10(unreachableReturn() RelaxedPrecision
Decorate 16(foo(vf4;) RelaxedPrecision
Decorate 15(bar) RelaxedPrecision
......@@ -41,15 +41,11 @@ spv.forwardFun.frag
Decorate 36(d) RelaxedPrecision
Decorate 36(d) Location 2
Decorate 37 RelaxedPrecision
Decorate 44 RelaxedPrecision
Decorate 45 RelaxedPrecision
Decorate 49 RelaxedPrecision
Decorate 50 RelaxedPrecision
Decorate 52 RelaxedPrecision
Decorate 55 RelaxedPrecision
Decorate 56 RelaxedPrecision
Decorate 59 RelaxedPrecision
Decorate 60 RelaxedPrecision
Decorate 63(bigColor) RelaxedPrecision
Decorate 63(bigColor) Location 0
Decorate 59(bigColor) RelaxedPrecision
Decorate 59(bigColor) Location 0
2: TypeVoid
3: TypeFunction 2
8: TypeFloat 32
......@@ -67,11 +63,11 @@ spv.forwardFun.frag
38: 8(float) Constant 1082549862
39: TypeBool
43: 8(float) Constant 1067030938
48: 8(float) Constant 1083179008
53: TypeInt 32 0
54: 53(int) Constant 0
57: 53(int) Constant 1
63(bigColor): 19(ptr) Variable Input
46: 8(float) Constant 1083179008
49: TypeInt 32 0
50: 49(int) Constant 0
53: 49(int) Constant 1
59(bigColor): 19(ptr) Variable Input
4(main): 2 Function None 3
5: Label
18(color): 13(ptr) Variable Function
......@@ -97,31 +93,25 @@ spv.forwardFun.frag
FunctionEnd
10(unreachableReturn(): 8(float) Function None 9
11: Label
44: 26(ptr) Variable Function
49: 26(ptr) Variable Function
34: 2 FunctionCall 6(bar()
37: 8(float) Load 36(d)
40: 39(bool) FOrdLessThan 37 38
SelectionMerge 42 None
BranchConditional 40 41 47
BranchConditional 40 41 45
41: Label
Store 44 43
45: 8(float) Load 44
ReturnValue 45
47: Label
Store 49 48
50: 8(float) Load 49
ReturnValue 50
ReturnValue 43
45: Label
ReturnValue 46
42: Label
Unreachable
FunctionEnd
16(foo(vf4;): 8(float) Function None 14
15(bar): 13(ptr) FunctionParameter
17: Label
55: 26(ptr) AccessChain 15(bar) 54
56: 8(float) Load 55
58: 26(ptr) AccessChain 15(bar) 57
59: 8(float) Load 58
60: 8(float) FAdd 56 59
ReturnValue 60
51: 26(ptr) AccessChain 15(bar) 50
52: 8(float) Load 51
54: 26(ptr) AccessChain 15(bar) 53
55: 8(float) Load 54
56: 8(float) FAdd 52 55
ReturnValue 56
FunctionEnd
glslang/Include/intermediate.h
......@@ -1231,6 +1231,7 @@ public:
TOperator getFlowOp() const { return flowOp; }
TIntermTyped* getExpression() const { return expression; }
void setExpression(TIntermTyped* pExpression) { expression = pExpression; }
void updatePrecision(TPrecisionQualifier parentPrecision);
protected:
TOperator flowOp;
TIntermTyped* expression;
......
glslang/MachineIndependent/Intermediate.cpp
......@@ -2777,6 +2777,22 @@ TIntermBranch* TIntermediate::addBranch(TOperator branchOp, TIntermTyped* expres
return node;
}
// Propagate precision from formal function return type to actual return type,
// and on to its subtree.
void TIntermBranch::updatePrecision(TPrecisionQualifier parentPrecision)
{
TIntermTyped* exp = getExpression();
if (exp == nullptr)
return;
if (exp->getBasicType() == EbtInt || exp->getBasicType() == EbtUint ||
exp->getBasicType() == EbtFloat || exp->getBasicType() == EbtFloat16) {
if (parentPrecision != EpqNone && exp->getQualifier().precision == EpqNone) {
exp->propagatePrecision(parentPrecision);
}
}
}
//
// This is to be executed after the final root is put on top by the parsing
// process.
......@@ -3284,9 +3300,11 @@ bool TIntermediate::promoteUnary(TIntermUnary& node)
return true;
}
// Propagate precision qualifiers *up* from children to parent.
void TIntermUnary::updatePrecision()
{
if (getBasicType() == EbtInt || getBasicType() == EbtUint || getBasicType() == EbtFloat || getBasicType() == EbtFloat16) {
if (getBasicType() == EbtInt || getBasicType() == EbtUint ||
getBasicType() == EbtFloat || getBasicType() == EbtFloat16) {
if (operand->getQualifier().precision > getQualifier().precision)
getQualifier().precision = operand->getQualifier().precision;
}
......@@ -3782,9 +3800,12 @@ bool TIntermediate::promoteAggregate(TIntermAggregate& node)
return false;
}
// Propagate precision qualifiers *up* from children to parent, and then
// back *down* again to the children's subtrees.
void TIntermBinary::updatePrecision()
{
if (getBasicType() == EbtInt || getBasicType() == EbtUint || getBasicType() == EbtFloat || getBasicType() == EbtFloat16) {
if (getBasicType() == EbtInt || getBasicType() == EbtUint ||
getBasicType() == EbtFloat || getBasicType() == EbtFloat16) {
getQualifier().precision = std::max(right->getQualifier().precision, left->getQualifier().precision);
if (getQualifier().precision != EpqNone) {
left->propagatePrecision(getQualifier().precision);
......@@ -3793,9 +3814,14 @@ void TIntermBinary::updatePrecision()
}
}
// Recursively propagate precision qualifiers *down* the subtree of the current node,
// until reaching a node that already has a precision qualifier or otherwise does
// not participate in precision propagation.
void TIntermTyped::propagatePrecision(TPrecisionQualifier newPrecision)
{
if (getQualifier().precision != EpqNone || (getBasicType() != EbtInt && getBasicType() != EbtUint && getBasicType() != EbtFloat && getBasicType() != EbtFloat16))
if (getQualifier().precision != EpqNone ||
(getBasicType() != EbtInt && getBasicType() != EbtUint &&
getBasicType() != EbtFloat && getBasicType() != EbtFloat16))
return;
getQualifier().precision = newPrecision;
......
glslang/MachineIndependent/ParseHelper.cpp
......@@ -1415,23 +1415,28 @@ TIntermNode* TParseContext::handleReturnValue(const TSourceLoc& loc, TIntermType
#endif
functionReturnsValue = true;
TIntermBranch* branch = nullptr;
if (currentFunctionType->getBasicType() == EbtVoid) {
error(loc, "void function cannot return a value", "return", "");
return intermediate.addBranch(EOpReturn, loc);
branch = intermediate.addBranch(EOpReturn, loc);
} else if (*currentFunctionType != value->getType()) {
TIntermTyped* converted = intermediate.addConversion(EOpReturn, *currentFunctionType, value);
if (converted) {
if (*currentFunctionType != converted->getType())
error(loc, "cannot convert return value to function return type", "return", "");
if (version < 420)
warn(loc, "type conversion on return values was not explicitly allowed until version 420", "return", "");
return intermediate.addBranch(EOpReturn, converted, loc);
warn(loc, "type conversion on return values was not explicitly allowed until version 420",
"return", "");
branch = intermediate.addBranch(EOpReturn, converted, loc);
} else {
error(loc, "type does not match, or is not convertible to, the function's return type", "return", "");
return intermediate.addBranch(EOpReturn, value, loc);
branch = intermediate.addBranch(EOpReturn, value, loc);
}
} else
return intermediate.addBranch(EOpReturn, value, loc);
branch = intermediate.addBranch(EOpReturn, value, loc);
branch->updatePrecision(currentFunctionType->getQualifier().precision);
return branch;
}
// See if the operation is being done in an illegal location.
......
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