Reviewers: Søren Gjesse,
Description:
ARM: Implement HasInstanceType in lithium backend.
Please review this at http://codereview.chromium.org/6283006/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M src/arm/lithium-codegen-arm.cc
Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index
6d360e0799225846209cbfdcb5a3efe89dc51209..8e783d91fa53fdfc7726fd91c62cbaea40069c0c
100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -1756,8 +1756,38 @@ Condition LHasInstanceType::BranchCondition() {
}
+static InstanceType TestType(HHasInstanceType* instr) {
+ InstanceType from = instr->from();
+ InstanceType to = instr->to();
+ if (from == FIRST_TYPE) return to;
+ ASSERT(from == to || to == LAST_TYPE);
+ return from;
+}
+
+
+static Condition BranchCondition(HHasInstanceType* instr) {
+ InstanceType from = instr->from();
+ InstanceType to = instr->to();
+ if (from == to) return eq;
+ if (to == LAST_TYPE) return hs;
+ if (from == FIRST_TYPE) return ls;
+ UNREACHABLE();
+ return eq;
+}
+
+
void LCodeGen::DoHasInstanceType(LHasInstanceType* instr) {
- Abort("DoHasInstanceType unimplemented.");
+ Register input = ToRegister(instr->input());
+ Register result = ToRegister(instr->result());
+
+ ASSERT(instr->hydrogen()->value()->representation().IsTagged());
+ __ tst(input, Operand(kSmiTagMask));
+ Label done, is_false;
+ __ b(eq, &is_false);
+ __ CompareObjectType(input, result, result, TestType(instr->hydrogen()));
+ Condition cond = BranchCondition(instr->hydrogen());
+ __ LoadRoot(result, Heap::kTrueValueRootIndex, cond);
+ __ LoadRoot(result, Heap::kFalseValueRootIndex, NegateCondition(cond));
}
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