Allow fast result return for formula-cells with...

"double" result which is a very frequent use-case.
This improves overall running times in most cases,
not just for the threaded path.

Change-Id: I18d10ee3cea613923e2057e746a6a8187bb18647
Reviewed-on: https://gerrit.libreoffice.org/59395
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

sc/inc/formularesult.hxx

@@ -82,6 +82,8 @@ class ScFormulaResult
     bool                mbEmpty :1; // empty cell result
     bool                mbEmptyDisplayedAsString :1;    // only if mbEmpty
     Multiline           meMultiline :2; // result is multiline
+    // If set it implies that the result is a simple double (in mfValue) and no error
+    bool                mbValueCached :1;
 
     /** Reset mnError, mbEmpty and mbEmptyDisplayedAsString to their defaults
         prior to assigning other types */

sc/source/core/tool/formularesult.cxx

@@ -25,13 +25,15 @@ FormulaResultValue::FormulaResultValue( FormulaError nErr ) : meType(Error), mfV
 ScFormulaResult::ScFormulaResult() :
     mpToken(nullptr), mnError(FormulaError::NONE), mbToken(true),
     mbEmpty(false), mbEmptyDisplayedAsString(false),
-    meMultiline(MULTILINE_UNKNOWN) {}
+    meMultiline(MULTILINE_UNKNOWN),
+    mbValueCached(false) {}
 
 ScFormulaResult::ScFormulaResult( const ScFormulaResult & r ) :
     mnError( r.mnError), mbToken( r.mbToken),
     mbEmpty( r.mbEmpty),
     mbEmptyDisplayedAsString( r.mbEmptyDisplayedAsString),
-    meMultiline( r.meMultiline)
+    meMultiline( r.meMultiline),
+    mbValueCached( r.mbValueCached)
 {
     if (mbToken)
     {
@@ -59,7 +61,7 @@ ScFormulaResult::ScFormulaResult( const ScFormulaResult & r ) :
 
 ScFormulaResult::ScFormulaResult( const formula::FormulaToken* p ) :
     mnError(FormulaError::NONE), mbToken(false), mbEmpty(false), mbEmptyDisplayedAsString(false),
-    meMultiline(MULTILINE_UNKNOWN)
+    meMultiline(MULTILINE_UNKNOWN), mbValueCached(false)
 {
     SetToken( p);
 }
@@ -76,6 +78,7 @@ void ScFormulaResult::ResetToDefaults()
     mbEmpty = false;
     mbEmptyDisplayedAsString = false;
     meMultiline = MULTILINE_UNKNOWN;
+    mbValueCached = false;
 }
 
 void ScFormulaResult::ResolveToken( const formula::FormulaToken * p )
@@ -110,6 +113,7 @@ void ScFormulaResult::ResolveToken( const formula::FormulaToken * p )
                 p->DecRef();
                 mbToken = false;
                 meMultiline = MULTILINE_FALSE;
+                mbValueCached = true;
                 break;
             default:
                 mpToken = p;
@@ -151,7 +155,7 @@ void ScFormulaResult::Assign( const ScFormulaResult & r )
         SetDouble( r.mfValue);
     // If there was an error there will be an error, no matter what Set...()
     // methods did.
-    mnError = r.mnError;
+    SetResultError(r.mnError);
 }
 
 void ScFormulaResult::SetToken( const formula::FormulaToken* p )
@@ -216,6 +220,7 @@ void ScFormulaResult::SetDouble( double f )
         mfValue = f;
         mbToken = false;
         meMultiline = MULTILINE_FALSE;
+        mbValueCached = true;
     }
 }
 
@@ -335,6 +340,12 @@ bool ScFormulaResult::IsMultiline() const
 
 bool ScFormulaResult::GetErrorOrDouble( FormulaError& rErr, double& rVal ) const
 {
+    if (mbValueCached)
+    {
+        rVal = mfValue;
+        return true;
+    }
+
     if (mnError != FormulaError::NONE)
     {
         rErr = mnError;
@@ -368,6 +379,9 @@ bool ScFormulaResult::GetErrorOrDouble( FormulaError& rErr, double& rVal ) const
 
 sc::FormulaResultValue ScFormulaResult::GetResult() const
 {
+    if (mbValueCached)
+        return sc::FormulaResultValue(mfValue);
+
     if (mnError != FormulaError::NONE)
         return sc::FormulaResultValue(mnError);
 
@@ -424,6 +438,8 @@ FormulaError ScFormulaResult::GetResultError() const
 void ScFormulaResult::SetResultError( FormulaError nErr )
 {
     mnError = nErr;
+    if (mnError != FormulaError::NONE)
+        mbValueCached = false;
 }
 
 formula::FormulaConstTokenRef ScFormulaResult::GetToken() const
@@ -443,6 +459,9 @@ formula::FormulaConstTokenRef ScFormulaResult::GetCellResultToken() const
 
 double ScFormulaResult::GetDouble() const
 {
+    if (mbValueCached)
+        return mfValue;
+
     if (mbToken)
     {
         // Should really not be of type formula::svDouble here.
@@ -536,6 +555,7 @@ void ScFormulaResult::SetHybridDouble( double f )
         mfValue = f;
         mbToken = false;
         meMultiline = MULTILINE_FALSE;
+        mbValueCached = true;
     }
 }