[JAEGER] Convert result of division to integer if possible (bug 585272, r=dvander).

js/src/assembler/assembler/AbstractMacroAssembler.h

@@ -389,7 +389,7 @@ public:
 
         void link(AbstractMacroAssembler<AssemblerType>* masm)
         {
-            size_t size = m_jumps.size();
+            size_t size = m_jumps.length();
             for (size_t i = 0; i < size; ++i)
                 m_jumps[i].link(masm);
             m_jumps.clear();
@@ -397,7 +397,7 @@ public:
         
         void linkTo(Label label, AbstractMacroAssembler<AssemblerType>* masm)
         {
-            size_t size = m_jumps.size();
+            size_t size = m_jumps.length();
             for (size_t i = 0; i < size; ++i)
                 m_jumps[i].linkTo(label, masm);
             m_jumps.clear();

js/src/assembler/assembler/X86Assembler.h

@@ -1668,9 +1668,7 @@ public:
 
     JmpSrc jne()
     {
-        FIXME_INSN_PRINTING;
-        m_formatter.twoByteOp(jccRel32(ConditionNE));
-        return m_formatter.immediateRel32();
+        return jCC(ConditionNE);
     }
     
     JmpSrc jnz()
@@ -1757,9 +1755,7 @@ public:
 
     JmpSrc jp()
     {
-        FIXME_INSN_PRINTING;
-        m_formatter.twoByteOp(jccRel32(ConditionP));
-        return m_formatter.immediateRel32();
+        return jCC(ConditionP);
     }
     
     JmpSrc js()

js/src/methodjit/Compiler.h

@@ -62,6 +62,7 @@ class Compiler
     typedef JSC::MacroAssembler::Address Address;
     typedef JSC::MacroAssembler::BaseIndex BaseIndex;
     typedef JSC::MacroAssembler::Jump Jump;
+    typedef JSC::MacroAssembler::JumpList JumpList;
     typedef JSC::MacroAssembler::Call Call;
     typedef JSC::MacroAssembler::DataLabelPtr DataLabelPtr;
 

js/src/methodjit/FastArithmetic.cpp

@@ -321,8 +321,32 @@ mjit::Compiler::jsop_binary_double(FrameEntry *lhs, FrameEntry *rhs, JSOp op, Vo
     }
 
     EmitDoubleOp(op, fpRight, fpLeft, masm);
+    
+    MaybeJump done;
+    
+    /*
+     * Try to convert result to integer. Skip this for 1/x or -1/x, as the
+     * result is unlikely to fit in an int.
+     */
+    if (op == JSOP_DIV && !(lhs->isConstant() && lhs->isType(JSVAL_TYPE_INT32) &&
+        abs(lhs->getValue().toInt32()) == 1)) {
+        RegisterID reg = frame.allocReg();
+        JumpList isDouble;
+        masm.branchConvertDoubleToInt32(fpLeft, reg, isDouble, fpRight);
+        
+        masm.storePayload(reg, frame.addressOf(lhs));
+        masm.storeTypeTag(ImmType(JSVAL_TYPE_INT32), frame.addressOf(lhs));
+        
+        frame.freeReg(reg);
+        done.setJump(masm.jump());
+        isDouble.linkTo(masm.label(), &masm);
+    }
+
     masm.storeDouble(fpLeft, frame.addressOf(lhs));
 
+    if (done.isSet())
+        done.getJump().linkTo(masm.label(), &masm);
+
     if (lhsNotNumber.isSet() || rhsNotNumber.isSet()) {
         stubcc.leave();
         stubcc.call(stub);