[crankshaft] Fix DoDeferredMathAbsTaggedHeapNumber overwriting the context with some temporary valu…

src/crankshaft/x87/lithium-codegen-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.
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/crankshaft/x87/lithium-codegen-x87.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 3330 matching lines @@
 }
 
 
 void LCodeGen::DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr) {
   Register input_reg = ToRegister(instr->value());
   __ cmp(FieldOperand(input_reg, HeapObject::kMapOffset),
          factory()->heap_number_map());
   DeoptimizeIf(not_equal, instr, Deoptimizer::kNotAHeapNumber);
 
   Label slow, allocated, done;
-  Register tmp = input_reg.is(eax) ? ecx : eax;
-  Register tmp2 = tmp.is(ecx) ? edx : input_reg.is(ecx) ? edx : ecx;
+  uint32_t available_regs = eax.bit() | ecx.bit() | edx.bit() | ebx.bit();
+  available_regs &= ~input_reg.bit();
+  if (instr->context()->IsRegister()) {
+    // Make sure that the context isn't overwritten in the AllocateHeapNumber
+    // macro below.
+    available_regs &= ~ToRegister(instr->context()).bit();
+  }
+
+  Register tmp =
+      Register::from_code(base::bits::CountTrailingZeros32(available_regs));
+  available_regs &= ~tmp.bit();
+  Register tmp2 =
+      Register::from_code(base::bits::CountTrailingZeros32(available_regs));
 
   // Preserve the value of all registers.
   PushSafepointRegistersScope scope(this);
 
   __ mov(tmp, FieldOperand(input_reg, HeapNumber::kExponentOffset));
   // Check the sign of the argument. If the argument is positive, just
   // return it. We do not need to patch the stack since |input| and
   // |result| are the same register and |input| will be restored
   // unchanged by popping safepoint registers.
   __ test(tmp, Immediate(HeapNumber::kSignMask));
@@ skipping 2493 matching lines @@
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87