From 72ccc49e66ff2edebd758efa27facca034bff10d Mon Sep 17 00:00:00 2001
From: Erik Verbruggen <erik.verbruggen@qt.io>
Date: Tue, 24 Jan 2017 11:45:54 +0100
Subject: Remove unnecessary assignment of binop results to temporaries

In many cases, the result can be directly assigned to the left-hand
side. So leave it to the place where the binop is used to decide when
to assign it to a temporary.

Change-Id: I9a88a71a77aa73afe88007eca744d3782fca34ac
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
---
 src/qml/compiler/qv4codegen.cpp | 39 ++++++++++++++++++++++-----------------
 src/qml/jit/qv4binop.cpp        |  1 -
 2 files changed, 22 insertions(+), 18 deletions(-)

(limited to 'src')

diff --git a/src/qml/compiler/qv4codegen.cpp b/src/qml/compiler/qv4codegen.cpp
index 7d3ad38f97..8d0126ebb3 100644
--- a/src/qml/compiler/qv4codegen.cpp
+++ b/src/qml/compiler/qv4codegen.cpp
@@ -73,6 +73,25 @@ static inline void setLocation(IR::Stmt *s, const SourceLocation &loc)
         s->location = loc;
 }
 
+static bool cjumpCanHandle(IR::AluOp op)
+{
+    switch (op) {
+    case IR::OpIn:
+    case IR::OpInstanceof:
+    case IR::OpEqual:
+    case IR::OpNotEqual:
+    case IR::OpGe:
+    case IR::OpGt:
+    case IR::OpLe:
+    case IR::OpLt:
+    case IR::OpStrictEqual:
+    case IR::OpStrictNotEqual:
+        return true;
+    default:
+        return false;
+    }
+}
+
 Codegen::ScanFunctions::ScanFunctions(Codegen *cg, const QString &sourceCode, CompilationMode defaultProgramMode)
     : _cg(cg)
     , _sourceCode(sourceCode)
@@ -715,7 +734,7 @@ IR::Stmt *Codegen::cjump(IR::Expr *cond, IR::BasicBlock *iftrue, IR::BasicBlock
     if (hasError)
         return 0;
 
-    if (! (cond->asTemp() || cond->asBinop())) {
+    if (! (cond->asTemp() || (cond->asBinop() && cjumpCanHandle(cond->asBinop()->op)) )) {
         const unsigned t = _block->newTemp();
         move(_block->TEMP(t), cond);
         cond = _block->TEMP(t);
@@ -1281,14 +1300,7 @@ bool Codegen::visit(BinaryExpression *ast)
         if (_expr.accept(cx)) {
             setLocation(cjump(binop(IR::binaryOperator(ast->op), left, *right, ast->operatorToken), _expr.iftrue, _expr.iffalse), ast->operatorToken);
         } else {
-            IR::Expr *e = binop(IR::binaryOperator(ast->op), left, *right, ast->operatorToken);
-            if (e->asConst() || e->asString())
-                _expr.code = e;
-            else {
-                const unsigned t = _block->newTemp();
-                setLocation(move(_block->TEMP(t), e), ast->operatorToken);
-                _expr.code = _block->TEMP(t);
-            }
+            _expr.code = binop(IR::binaryOperator(ast->op), left, *right, ast->operatorToken);
         }
         break;
     }
@@ -1314,14 +1326,7 @@ bool Codegen::visit(BinaryExpression *ast)
         if (hasError)
             return false;
 
-        IR::Expr *e = binop(IR::binaryOperator(ast->op), left, *right, ast->operatorToken);
-        if (e->asConst() || e->asString())
-            _expr.code = e;
-        else {
-            const unsigned t = _block->newTemp();
-            setLocation(move(_block->TEMP(t), e), ast->operatorToken);
-            _expr.code = _block->TEMP(t);
-        }
+        _expr.code = binop(IR::binaryOperator(ast->op), left, *right, ast->operatorToken);
         break;
     }
 
diff --git a/src/qml/jit/qv4binop.cpp b/src/qml/jit/qv4binop.cpp
index 6d20a4e042..22067bbb13 100644
--- a/src/qml/jit/qv4binop.cpp
+++ b/src/qml/jit/qv4binop.cpp
@@ -331,7 +331,6 @@ void Binop<JITAssembler>::doubleBinop(IR::Expr *lhs, IR::Expr *rhs, IR::Expr *ta
         break;
 
     default: {
-        Q_ASSERT(target->type == IR::BoolType);
         Jump trueCase = as->branchDouble(false, op, lhs, rhs);
         as->storeBool(false, target);
         Jump done = as->jump();
-- 
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