X87: Made the detailed reason for deopts mandatory on x87. Unified and improved things.

src/x87/macro-assembler-x87.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 225 matching lines @@
 void MacroAssembler::TruncateX87TOSToI(Register result_reg) {
   sub(esp, Immediate(kDoubleSize));
   fst_d(MemOperand(esp, 0));
   SlowTruncateToI(result_reg, esp, 0);
   add(esp, Immediate(kDoubleSize));
 }
 
 
 void MacroAssembler::X87TOSToI(Register result_reg,
                                MinusZeroMode minus_zero_mode,
-                               Label* conversion_failed,
-                               Label::Distance dst) {
+                               Label* lost_precision, Label* is_nan,
+                               Label* minus_zero, Label::Distance dst) {
   Label done;
   sub(esp, Immediate(kPointerSize));
   fld(0);
   fist_s(MemOperand(esp, 0));
   fild_s(MemOperand(esp, 0));
   pop(result_reg);
   FCmp();
-  j(not_equal, conversion_failed, dst);
-  j(parity_even, conversion_failed, dst);
+  j(not_equal, lost_precision, dst);
+  j(parity_even, is_nan, dst);
   if (minus_zero_mode == FAIL_ON_MINUS_ZERO) {
     test(result_reg, Operand(result_reg));
     j(not_zero, &done, Label::kNear);
     // To check for minus zero, we load the value again as float, and check
     // if that is still 0.
     sub(esp, Immediate(kPointerSize));
     fst_s(MemOperand(esp, 0));
     pop(result_reg);
     test(result_reg, Operand(result_reg));
-    j(not_zero, conversion_failed, dst);
+    j(not_zero, minus_zero, dst);
   }
   bind(&done);
 }
 
 
 void MacroAssembler::TruncateHeapNumberToI(Register result_reg,
                                            Register input_reg) {
   Label done, slow_case;
 
   SlowTruncateToI(result_reg, input_reg);
@@ skipping 3069 matching lines @@
   if (mag.shift > 0) sar(edx, mag.shift);
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X87