ARM64: always restore regexp register cache after a C function call.

BUG=v8:3444
TEST=mjsunit/regress/regress-regexp-nocase.js
LOG=N
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/392403002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22443 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm64/regexp-macro-assembler-arm64.cc

@@ -397,11 +397,14 @@ void RegExpMacroAssemblerARM64::CheckNotBackReferenceIgnoreCase(
     }
 
     // Check if function returned non-zero for success or zero for failure.
-    CompareAndBranchOrBacktrack(x0, 0, eq, on_no_match);
+    // x0 is one of the registers used as a cache so it must be tested before
+    // the cache is restored.
+    __ Cmp(x0, 0);
+    __ PopCPURegList(cached_registers);
+    BranchOrBacktrack(eq, on_no_match);
+
     // On success, increment position by length of capture.
     __ Add(current_input_offset(), current_input_offset(), capture_length);
-    // Reset the cached registers.
-    __ PopCPURegList(cached_registers);
   }
 
   __ Bind(&fallthrough);

test/mjsunit/regress/regress-regexp-nocase.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
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+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
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+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+var s = "('')x\nx\uF670";
+
+assertEquals(s.match(/\((').*\1\)/i), ["('')", "'"]);