Use Q_UNLIKELY for every qFatal()/qCritical()

If, after checking a condition, we issue a qFatal()
or a qCritical(), by definition that check is
unlikely to be true.

Tell the compiler so it can move the error handling
code out of the normal code path to increase the
effective icache size.

Moved conditional code around where possible so that
we could always use Q_UNLIKELY, instead of having to
revert to Q_LIKELY here and there.

In some cases, simplified the expressions newly wrapped
in Q_UNLIKELY as a drive-by.

Change-Id: I67537d62b04bc6977d69254690c5ebbdf98bfd6d
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/src/plugins/platforms/openwfd/qopenwfdport.cpp b/src/plugins/platforms/openwfd/qopenwfdport.cpp
index 8da1e9bd34..c1646fbdf9 100644
--- a/src/plugins/platforms/openwfd/qopenwfdport.cpp
+++ b/src/plugins/platforms/openwfd/qopenwfdport.cpp
@@ -96,9 +96,8 @@ void QOpenWFDPort::attach()
     mPhysicalSize = QSizeF(physicalWFDSize[0],physicalWFDSize[1]);
 
     WFDint numAvailablePipelines = wfdGetPortAttribi(mDevice->handle(),mPort,WFD_PORT_PIPELINE_ID_COUNT);
-    if (!numAvailablePipelines) {
+    if (Q_UNLIKELY(!numAvailablePipelines))
         qFatal("Not possible to make screen that is not possible to create WFPort with no pipline");
-    }
 
     WFDint pipeIds[numAvailablePipelines];
     wfdGetPortAttribiv(mDevice->handle(),mPort,WFD_PORT_BINDABLE_PIPELINE_IDS,numAvailablePipelines,pipeIds);
@@ -109,9 +108,9 @@ void QOpenWFDPort::attach()
             mDevice-> addToUsedPipelineSet(mPipelineId,this);
 
             mPipeline = wfdCreatePipeline(mDevice->handle(),mPipelineId,WFD_NONE);
-            if (mPipeline == WFD_INVALID_HANDLE) {
+            if (Q_UNLIKELY(mPipeline == WFD_INVALID_HANDLE))
                 qFatal("Failed to create pipeline for port %p", this);
-            }
+
             break;
         }
     }