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ByteCode: Faster eval in getLocation, add safety for double side-effects

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Change-Id: I4d1a102264d8c97bf9120c3891d569ef96a92922
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/222782
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
This commit is contained in:
Brian Osman 2019-06-21 11:05:47 -04:00 committed by Skia Commit-Bot
parent 62392726b7
commit 8676929c0a
1 changed files with 33 additions and 10 deletions
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43
src/sksl/SkSLByteCodeGenerator.cpp
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@ -213,7 +213,6 @@ int ByteCodeGenerator::getLocation(const Variable& var) {
}
}
// TODO: Elide Add 0 and Mul 1 sequences
int ByteCodeGenerator::getLocation(const Expression& expr, Variable::Storage* storage) {
switch (expr.fKind) {
case Expression::kFieldAccess_Kind: {
@ -224,9 +223,11 @@ int ByteCodeGenerator::getLocation(const Expression& expr, Variable::Storage* st
offset += SlotCount(*f.fBase->fType.fields()[i].fType);
}
if (baseAddr < 0) {
this->write(ByteCodeInstruction::kPushImmediate);
this->write32(offset);
this->write(ByteCodeInstruction::kAddI);
if (offset != 0) {
this->write(ByteCodeInstruction::kPushImmediate);
this->write32(offset);
this->write(ByteCodeInstruction::kAddI);
}
return -1;
} else {
return baseAddr + offset;
@ -239,15 +240,35 @@ int ByteCodeGenerator::getLocation(const Expression& expr, Variable::Storage* st
if (i.fIndex->isConstant()) {
offset = i.fIndex->getConstantInt() * stride;
} else {
if (i.fIndex->hasSideEffects()) {
// Having a side-effect in an indexer is technically safe for an rvalue,
// but with lvalues we have to evaluate the indexer twice, so make it an error.
fErrors.error(i.fIndex->fOffset,
"Index expressions with side-effects not supported in byte code.");
return 0;
}
this->writeExpression(*i.fIndex);
this->write(ByteCodeInstruction::kPushImmediate);
this->write32(stride);
this->write(ByteCodeInstruction::kMultiplyI);
if (stride != 1) {
this->write(ByteCodeInstruction::kPushImmediate);
this->write32(stride);
this->write(ByteCodeInstruction::kMultiplyI);
}
}
int baseAddr = this->getLocation(*i.fBase, storage);
// Are both components known statically?
if (baseAddr >= 0 && offset >= 0) {
return baseAddr + offset;
}
// At least one component is dynamic (and on the stack).
// If the other component is zero, we're done
if (baseAddr == 0 || offset == 0) {
return -1;
}
// Push the non-dynamic component (if any) to the stack, then add the two
if (baseAddr >= 0) {
this->write(ByteCodeInstruction::kPushImmediate);
this->write32(baseAddr);
@ -265,9 +286,11 @@ int ByteCodeGenerator::getLocation(const Expression& expr, Variable::Storage* st
int baseAddr = this->getLocation(*s.fBase, storage);
int offset = s.fComponents[0];
if (baseAddr < 0) {
this->write(ByteCodeInstruction::kPushImmediate);
this->write32(offset);
this->write(ByteCodeInstruction::kAddI);
if (offset != 0) {
this->write(ByteCodeInstruction::kPushImmediate);
this->write32(offset);
this->write(ByteCodeInstruction::kAddI);
}
return -1;
} else {
return baseAddr + offset;