From c3a818d19e34e08e0759dedce18d9daa5ba7d94e Mon Sep 17 00:00:00 2001
From: Erik Verbruggen <erik.verbruggen@digia.com>
Date: Thu, 12 Nov 2015 14:01:48 +0100
Subject: Use qtbase add/sub/mul with overflow implementations.

Those use compiler intrinsics when available. If not, the same code that
was previously in qtdeclarative is used.

Depends on 5ff7a3d96e0ce0dcb3d388b53d038cdd40c7a975 in qtbase.

Change-Id: I8adf1a9d368ffc4e368260de518725ed7be6d2b8
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
---
 src/qml/jsruntime/qv4math_p.h | 73 ++++++-------------------------------------
 1 file changed, 10 insertions(+), 63 deletions(-)

(limited to 'src/qml/jsruntime')

diff --git a/src/qml/jsruntime/qv4math_p.h b/src/qml/jsruntime/qv4math_p.h
index cf627bcc5d..51031356bc 100644
--- a/src/qml/jsruntime/qv4math_p.h
+++ b/src/qml/jsruntime/qv4math_p.h
@@ -47,6 +47,7 @@
 #include <qglobal.h>
 
 #include <QtCore/qnumeric.h>
+#include <QtCore/private/qnumeric_p.h>
 #include <cmath>
 
 #if defined(Q_CC_GNU)
@@ -59,84 +60,30 @@ QT_BEGIN_NAMESPACE
 
 namespace QV4 {
 
-#if defined(Q_CC_GNU) && defined(Q_PROCESSOR_X86)
-
 static inline QMLJS_READONLY ReturnedValue add_int32(int a, int b)
 {
-    quint8 overflow = 0;
-    int aa = a;
-
-    asm ("addl %2, %1\n"
-         "seto %0"
-    : "=q" (overflow), "=r" (aa)
-         : "r" (b), "1" (aa)
-         : "cc"
-    );
-    if (Q_UNLIKELY(overflow))
+    int result;
+    if (Q_UNLIKELY(add_overflow(a, b, &result)))
         return Primitive::fromDouble(static_cast<double>(a) + b).asReturnedValue();
-    return Primitive::fromInt32(aa).asReturnedValue();
+    return Primitive::fromInt32(result).asReturnedValue();
 }
 
 static inline QMLJS_READONLY ReturnedValue sub_int32(int a, int b)
 {
-    quint8 overflow = 0;
-    int aa = a;
-
-    asm ("subl %2, %1\n"
-         "seto %0"
-    : "=q" (overflow), "=r" (aa)
-         : "r" (b), "1" (aa)
-         : "cc"
-    );
-    if (Q_UNLIKELY(overflow))
+    int result;
+    if (Q_UNLIKELY(sub_overflow(a, b, &result)))
         return Primitive::fromDouble(static_cast<double>(a) - b).asReturnedValue();
-    return Primitive::fromInt32(aa).asReturnedValue();
+    return Primitive::fromInt32(result).asReturnedValue();
 }
 
 static inline QMLJS_READONLY ReturnedValue mul_int32(int a, int b)
 {
-    quint8 overflow = 0;
-    int aa = a;
-
-    asm ("imul %2, %1\n"
-         "setc %0"
-         : "=q" (overflow), "=r" (aa)
-         : "r" (b), "1" (aa)
-         : "cc"
-    );
-    if (Q_UNLIKELY(overflow))
+    int result;
+    if (Q_UNLIKELY(mul_overflow(a, b, &result)))
         return Primitive::fromDouble(static_cast<double>(a) * b).asReturnedValue();
-    return Primitive::fromInt32(aa).asReturnedValue();
-}
-
-#else
-
-static inline QMLJS_READONLY ReturnedValue add_int32(int a, int b)
-{
-    qint64 result = static_cast<qint64>(a) + b;
-    if (Q_UNLIKELY(result > INT_MAX || result < INT_MIN))
-        return Primitive::fromDouble(static_cast<double>(a) + b).asReturnedValue();
-    return Primitive::fromInt32(static_cast<int>(result)).asReturnedValue();
+    return Primitive::fromInt32(result).asReturnedValue();
 }
 
-static inline QMLJS_READONLY ReturnedValue sub_int32(int a, int b)
-{
-    qint64 result = static_cast<qint64>(a) - b;
-    if (Q_UNLIKELY(result > INT_MAX || result < INT_MIN))
-        return Primitive::fromDouble(static_cast<double>(a) - b).asReturnedValue();
-    return Primitive::fromInt32(static_cast<int>(result)).asReturnedValue();
-}
-
-static inline QMLJS_READONLY ReturnedValue mul_int32(int a, int b)
-{
-    qint64 result = static_cast<qint64>(a) * b;
-    if (Q_UNLIKELY(result > INT_MAX || result < INT_MIN))
-        return Primitive::fromDouble(static_cast<double>(a) * b).asReturnedValue();
-    return Primitive::fromInt32(static_cast<int>(result)).asReturnedValue();
-}
-
-#endif
-
 }
 
 QT_END_NAMESPACE
-- 
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