[arm64] Change comparison to CBNZ in PropertyHandlerCompiler::CheckPrototypes.

BUG= Review-Url: https://codereview.chromium.org/2503453002 Cr-Commit-Position: refs/heads/master@{#40985}

[arm64] Change comparison to CBNZ in PropertyHandlerCompiler::CheckPrototypes.
BUG= Review-Url: https://codereview.chromium.org/2503453002 Cr-Commit-Position: refs/heads/master@{#40985}
fa567a49 · georgia.kouveli · Commit bot · 8b649a41 · fa567a49
Commit fa567a49 authored Nov 15, 2016 by georgia.kouveli Committed by Commit bot Nov 15, 2016
Hide whitespace changes
Inline Side-by-side

Showing with 4 additions and 2 deletions

handler-compiler-arm64.cc src/ic/arm64/handler-compiler-arm64.cc +4 -2

No files found.
--- a/src/ic/arm64/handler-compiler-arm64.cc
+++ b/src/ic/arm64/handler-compiler-arm64.cc
@@ -478,8 +478,10 @@ Register PropertyHandlerCompiler::CheckPrototypes(
    DCHECK_EQ(Smi::FromInt(Map::kPrototypeChainValid), validity_cell->value());
    __ Mov(scratch1, Operand(validity_cell));
    __ Ldr(scratch1, FieldMemOperand(scratch1, Cell::kValueOffset));
-    __ Cmp(scratch1, Operand(Smi::FromInt(Map::kPrototypeChainValid)));
+    // Compare scratch1 against Map::kPrototypeChainValid.
-    __ B(ne, miss);
+    static_assert(Map::kPrototypeChainValid == 0,
+                  "Map::kPrototypeChainValid has unexpected value");
+    __ Cbnz(scratch1, miss);
  }
  // Keep track of the current object in register reg.