More Math.abs tweaks for Intel platforms.

Made ia32/x64 code more uniform. Minor jump tweaks.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/20067003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15857 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/lithium-codegen-ia32.cc

@@ -3722,38 +3722,30 @@ void LCodeGen::DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr) {
          factory()->heap_number_map());
   DeoptimizeIf(not_equal, instr->environment());
 
-  Label done;
+  Label slow, allocated, done;
   Register tmp = input_reg.is(eax) ? ecx : eax;
   Register tmp2 = tmp.is(ecx) ? edx : input_reg.is(ecx) ? edx : ecx;
 
   // Preserve the value of all registers.
   PushSafepointRegistersScope scope(this);
 
-  Label negative;
   __ 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));
-  __ j(not_zero, &negative);
+  __ j(zero, &done);
-  __ jmp(&done);
 
-  __ bind(&negative);
-
-  Label allocated, slow;
   __ AllocateHeapNumber(tmp, tmp2, no_reg, &slow);
-  __ jmp(&allocated);
+  __ jmp(&allocated, Label::kNear);
 
   // Slow case: Call the runtime system to do the number allocation.
   __ bind(&slow);
-
   CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0,
                           instr, instr->context());
-
   // Set the pointer to the new heap number in tmp.
   if (!tmp.is(eax)) __ mov(tmp, eax);
-
   // Restore input_reg after call to runtime.
   __ LoadFromSafepointRegisterSlot(input_reg, input_reg);
 
@@ -3773,7 +3765,7 @@ void LCodeGen::EmitIntegerMathAbs(LMathAbs* instr) {
   Register input_reg = ToRegister(instr->value());
   __ test(input_reg, Operand(input_reg));
   Label is_positive;
-  __ j(not_sign, &is_positive);
+  __ j(not_sign, &is_positive, Label::kNear);
   __ neg(input_reg);  // Sets flags.
   DeoptimizeIf(negative, instr->environment());
   __ bind(&is_positive);

src/x64/lithium-codegen-x64.cc

@@ -3329,38 +3329,29 @@ void LCodeGen::DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr) {
                  Heap::kHeapNumberMapRootIndex);
   DeoptimizeIf(not_equal, instr->environment());
 
-  Label done;
+  Label slow, allocated, done;
   Register tmp = input_reg.is(rax) ? rcx : rax;
   Register tmp2 = tmp.is(rcx) ? rdx : input_reg.is(rcx) ? rdx : rcx;
 
   // Preserve the value of all registers.
   PushSafepointRegistersScope scope(this);
 
-  Label negative;
   __ movl(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.
   __ testl(tmp, Immediate(HeapNumber::kSignMask));
-  __ j(not_zero, &negative);
+  __ j(zero, &done);
-  __ jmp(&done);
 
-  __ bind(&negative);
-
-  Label allocated, slow;
   __ AllocateHeapNumber(tmp, tmp2, &slow);
-  __ jmp(&allocated);
+  __ jmp(&allocated, Label::kNear);
 
   // Slow case: Call the runtime system to do the number allocation.
   __ bind(&slow);
-
   CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr);
   // Set the pointer to the new heap number in tmp.
-  if (!tmp.is(rax)) {
+  if (!tmp.is(rax)) __ movq(tmp, rax);
-    __ movq(tmp, rax);
-  }
-
   // Restore input_reg after call to runtime.
   __ LoadFromSafepointRegisterSlot(input_reg, input_reg);
 
@@ -3379,7 +3370,7 @@ void LCodeGen::EmitIntegerMathAbs(LMathAbs* instr) {
   Register input_reg = ToRegister(instr->value());
   __ testl(input_reg, input_reg);
   Label is_positive;
-  __ j(not_sign, &is_positive);
+  __ j(not_sign, &is_positive, Label::kNear);
   __ negl(input_reg);  // Sets flags.
   DeoptimizeIf(negative, instr->environment());
   __ bind(&is_positive);