From 28483ffeb3ce527275a0bf745caac51ae00ea2f8 Mon Sep 17 00:00:00 2001
From: bmeurer <bmeurer@chromium.org>
Date: Thu, 19 Feb 2015 02:38:24 -0800
Subject: [PATCH] Revert of [x64] Generate test reg,reg instead of cmp reg,0.
 (patchset #2 id:20001 of https://codereview.chromium.org/916543004/)

Reason for revert:
Tanks some benchmarks (for no obvious reason)

Original issue's description:
> [x64] Generate test reg,reg instead of cmp reg,0.
>
> The instruction sequence is shorter and saves decoding bandwidth.
>
> R=svenpanne@chromium.org
>
> Committed: https://crrev.com/a7fb5ed400701b22c455d0ad410bc98b211e5730
> Cr-Commit-Position: refs/heads/master@{#26734}

TBR=svenpanne@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/939923003

Cr-Commit-Position: refs/heads/master@{#26742}
---
 src/compiler/x64/code-generator-x64.cc | 25 ++-----------------------
 1 file changed, 2 insertions(+), 23 deletions(-)

diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 8966fff01c..973bbd1ef0 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -210,27 +210,6 @@ class OutOfLineTruncateDoubleToI FINAL : public OutOfLineCode {
   } while (0)
 
 
-#define ASSEMBLE_CMP(cmp_instr, test_instr)                      \
-  do {                                                           \
-    if (HasImmediateInput(instr, 1)) {                           \
-      if (instr->InputAt(0)->IsRegister()) {                     \
-        if (i.InputInt32(1) == 0) {                              \
-          __ test_instr(i.InputRegister(0), i.InputRegister(0)); \
-        } else {                                                 \
-          __ cmp_instr(i.InputRegister(0), i.InputImmediate(1)); \
-        }                                                        \
-      } else {                                                   \
-        __ cmp_instr(i.InputOperand(0), i.InputImmediate(1));    \
-      }                                                          \
-    } else {                                                     \
-      if (instr->InputAt(1)->IsRegister()) {                     \
-        __ cmp_instr(i.InputRegister(0), i.InputRegister(1));    \
-      } else {                                                   \
-        __ cmp_instr(i.InputRegister(0), i.InputOperand(1));     \
-      }                                                          \
-    }                                                            \
-  } while (0)
-
 #define ASSEMBLE_MULT(asm_instr)                              \
   do {                                                        \
     if (HasImmediateInput(instr, 1)) {                        \
@@ -609,10 +588,10 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       ASSEMBLE_BINOP(andq);
       break;
     case kX64Cmp32:
-      ASSEMBLE_CMP(cmpl, testl);
+      ASSEMBLE_BINOP(cmpl);
       break;
     case kX64Cmp:
-      ASSEMBLE_CMP(cmpq, testq);
+      ASSEMBLE_BINOP(cmpq);
       break;
     case kX64Test32:
       ASSEMBLE_BINOP(testl);