Smaller instruction to test negative number on ia32

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/23361030

Patch from Weiliang Lin <weiliang.lin2@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16335 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/disasm-ia32.cc

@@ -606,7 +606,7 @@ int DisassemblerIA32::D1D3C1Instruction(byte* data) {
     }
     ASSERT_NE(NULL, mnem);
     AppendToBuffer("%s %s,", mnem, NameOfCPURegister(rm));
-    if (imm8 > 0) {
+    if (imm8 >= 0) {
       AppendToBuffer("%d", imm8);
     } else {
       AppendToBuffer("cl");

src/ia32/lithium-codegen-ia32.cc

@@ -1787,8 +1787,8 @@ void LCodeGen::DoShiftI(LShiftI* instr) {
       case Token::ROR:
         __ ror_cl(ToRegister(left));
         if (instr->can_deopt()) {
-          __ test(ToRegister(left), Immediate(0x80000000));
-          DeoptimizeIf(not_zero, instr->environment());
+          __ test(ToRegister(left), ToRegister(left));
+          DeoptimizeIf(sign, instr->environment());
         }
         break;
       case Token::SAR:
@@ -1797,8 +1797,8 @@ void LCodeGen::DoShiftI(LShiftI* instr) {
       case Token::SHR:
         __ shr_cl(ToRegister(left));
         if (instr->can_deopt()) {
-          __ test(ToRegister(left), Immediate(0x80000000));
-          DeoptimizeIf(not_zero, instr->environment());
+          __ test(ToRegister(left), ToRegister(left));
+          DeoptimizeIf(sign, instr->environment());
         }
         break;
       case Token::SHL:
@@ -1814,8 +1814,8 @@ void LCodeGen::DoShiftI(LShiftI* instr) {
     switch (instr->op()) {
       case Token::ROR:
         if (shift_count == 0 && instr->can_deopt()) {
-          __ test(ToRegister(left), Immediate(0x80000000));
-          DeoptimizeIf(not_zero, instr->environment());
+          __ test(ToRegister(left), ToRegister(left));
+          DeoptimizeIf(sign, instr->environment());
         } else {
           __ ror(ToRegister(left), shift_count);
         }
@@ -1827,8 +1827,8 @@ void LCodeGen::DoShiftI(LShiftI* instr) {
         break;
       case Token::SHR:
         if (shift_count == 0 && instr->can_deopt()) {
-          __ test(ToRegister(left), Immediate(0x80000000));
-          DeoptimizeIf(not_zero, instr->environment());
+          __ test(ToRegister(left), ToRegister(left));
+          DeoptimizeIf(sign, instr->environment());
         } else {
           __ shr(ToRegister(left), shift_count);
         }