From 547589e280abaf23584850d1b9ad1b97f1a94147 Mon Sep 17 00:00:00 2001
From: "weiliang.lin@intel.com" <weiliang.lin@intel.com>
Date: Fri, 5 Sep 2014 07:29:08 +0000
Subject: [PATCH] X87: Remove dead code for inline string hashing.

port r23689.

original commit message:

  Remove dead code for inline string hashing.

  This has become obsolete since hydrogenized StringAdd.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/545093002

Patch from Jing Bao <jing.bao@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23714 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/x87/code-stubs-x87.cc | 68 ---------------------------------------
 src/x87/code-stubs-x87.h  | 15 ---------
 2 files changed, 83 deletions(-)

diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index a84438f43..0da86eb21 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -2570,74 +2570,6 @@ void StringHelper::GenerateCopyCharacters(MacroAssembler* masm,
 }
 
 
-void StringHelper::GenerateHashInit(MacroAssembler* masm,
-                                    Register hash,
-                                    Register character,
-                                    Register scratch) {
-  // hash = (seed + character) + ((seed + character) << 10);
-  if (masm->serializer_enabled()) {
-    __ LoadRoot(scratch, Heap::kHashSeedRootIndex);
-    __ SmiUntag(scratch);
-    __ add(scratch, character);
-    __ mov(hash, scratch);
-    __ shl(scratch, 10);
-    __ add(hash, scratch);
-  } else {
-    int32_t seed = masm->isolate()->heap()->HashSeed();
-    __ lea(scratch, Operand(character, seed));
-    __ shl(scratch, 10);
-    __ lea(hash, Operand(scratch, character, times_1, seed));
-  }
-  // hash ^= hash >> 6;
-  __ mov(scratch, hash);
-  __ shr(scratch, 6);
-  __ xor_(hash, scratch);
-}
-
-
-void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
-                                            Register hash,
-                                            Register character,
-                                            Register scratch) {
-  // hash += character;
-  __ add(hash, character);
-  // hash += hash << 10;
-  __ mov(scratch, hash);
-  __ shl(scratch, 10);
-  __ add(hash, scratch);
-  // hash ^= hash >> 6;
-  __ mov(scratch, hash);
-  __ shr(scratch, 6);
-  __ xor_(hash, scratch);
-}
-
-
-void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
-                                       Register hash,
-                                       Register scratch) {
-  // hash += hash << 3;
-  __ mov(scratch, hash);
-  __ shl(scratch, 3);
-  __ add(hash, scratch);
-  // hash ^= hash >> 11;
-  __ mov(scratch, hash);
-  __ shr(scratch, 11);
-  __ xor_(hash, scratch);
-  // hash += hash << 15;
-  __ mov(scratch, hash);
-  __ shl(scratch, 15);
-  __ add(hash, scratch);
-
-  __ and_(hash, String::kHashBitMask);
-
-  // if (hash == 0) hash = 27;
-  Label hash_not_zero;
-  __ j(not_zero, &hash_not_zero, Label::kNear);
-  __ mov(hash, Immediate(StringHasher::kZeroHash));
-  __ bind(&hash_not_zero);
-}
-
-
 void SubStringStub::Generate(MacroAssembler* masm) {
   Label runtime;
 
diff --git a/src/x87/code-stubs-x87.h b/src/x87/code-stubs-x87.h
index 67f229305..9939bab35 100644
--- a/src/x87/code-stubs-x87.h
+++ b/src/x87/code-stubs-x87.h
@@ -28,21 +28,6 @@ class StringHelper : public AllStatic {
                                      Register scratch,
                                      String::Encoding encoding);
 
-  // Generate string hash.
-  static void GenerateHashInit(MacroAssembler* masm,
-                               Register hash,
-                               Register character,
-                               Register scratch);
-
-  static void GenerateHashAddCharacter(MacroAssembler* masm,
-                                       Register hash,
-                                       Register character,
-                                       Register scratch);
-
-  static void GenerateHashGetHash(MacroAssembler* masm,
-                                  Register hash,
-                                  Register scratch);
-
   // Compares two flat ASCII strings and returns result in eax.
   static void GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
                                               Register left, Register right,
-- 
2.34.1