ART: Implement HBooleanNot instruction
Optimizations simplifying operations on boolean values (boolean
simplifier, instruction simplifier) can benefit from having a special
HInstruction for negating booleans in order to perform more transforms
and produce faster machine code.
This patch implements HBooleanNot as 'x xor 1', assuming that booleans
are 1-bit integers and allowing for a single-instruction negation on
all supported platforms.
Change-Id: I33a2649c1821255b18a86ca68ed16416063c739f
diff --git a/compiler/optimizing/code_generator_arm64.cc b/compiler/optimizing/code_generator_arm64.cc
index a5ddd6b..7dfb595 100644
--- a/compiler/optimizing/code_generator_arm64.cc
+++ b/compiler/optimizing/code_generator_arm64.cc
@@ -2279,6 +2279,17 @@
}
}
+void LocationsBuilderARM64::VisitBooleanNot(HBooleanNot* instruction) {
+ LocationSummary* locations = new (GetGraph()->GetArena()) LocationSummary(instruction);
+ locations->SetInAt(0, Location::RequiresRegister());
+ locations->SetOut(Location::RequiresRegister(), Location::kNoOutputOverlap);
+}
+
+void InstructionCodeGeneratorARM64::VisitBooleanNot(HBooleanNot* instruction) {
+ DCHECK_EQ(instruction->InputAt(0)->GetType(), Primitive::kPrimBoolean);
+ __ Eor(OutputRegister(instruction), InputRegisterAt(instruction, 0), vixl::Operand(1));
+}
+
void LocationsBuilderARM64::VisitNullCheck(HNullCheck* instruction) {
LocationSummary* locations =
new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kNoCall);