Add option for the first fit window in local RA

Change-Id: Ia91611523cec942c9c8921a24e7c0dad2d40df91

Author: bcheng0127

visa/LocalRA.cpp

@@ -39,8 +39,6 @@ using namespace vISA;
 
 #define NUM_PREGS_FOR_UNIQUE_ASSIGN 50
 
-#define FF_LRA_WINDOW_SIZE 12
-
 #define SPLIT_REF_CNT_THRESHOLD 3
 #define SPLIT_USE_CNT_THRESHOLD 2
 #define SPLIT_USE_DISTANCE_THRESHOLD 100
@@ -2063,7 +2061,7 @@ bool PhyRegsLocalRA::findFreeMultipleRegsForward(int regIdx, BankAlign align, in
     {
         if (isGRFAvailable(i) && forbidden.find(i) == forbidden.end() &&
             regBusyVector[i] == 0 &&
-            (!isHybridAlloc || (((instID - regLastUse[i]) / 2 >= FF_LRA_WINDOW_SIZE) || (regLastUse[i] == 0)) || hintSet))
+            (!isHybridAlloc || (((instID - regLastUse[i]) / 2 >= LraFFWindowSize) || (regLastUse[i] == 0)) || hintSet))
         {
             foundItem++;
         }
@@ -2089,7 +2087,7 @@ bool PhyRegsLocalRA::findFreeMultipleRegsForward(int regIdx, BankAlign align, in
                 if (i + 1 <= endReg + nrows - 1 &&
                     isGRFAvailable(i + 1) && forbidden.find(i+1) == forbidden.end() &&
                     (isWordBusy(i + 1, 0, lastRowSize) == false) &&
-                    (!isHybridAlloc || (((instID - regLastUse[i + 1]) / 2 >= FF_LRA_WINDOW_SIZE) || (regLastUse[i + 1] == 0))))
+                    (!isHybridAlloc || (((instID - regLastUse[i + 1]) / 2 >= LraFFWindowSize) || (regLastUse[i + 1] == 0))))
                 {
                     regnum = startReg;
                     return true;
@@ -2137,7 +2135,7 @@ bool PhyRegsLocalRA::findFreeMultipleRegsBackward(int regIdx, BankAlign align, i
     {
         if (isGRFAvailable(i) && forbidden.find(i) == forbidden.end() &&
             regBusyVector[i] == 0 &&
-            (!isHybridAlloc || (((instID - regLastUse[i]) / 2 >= FF_LRA_WINDOW_SIZE) || (regLastUse[i] == 0))))
+            (!isHybridAlloc || (((instID - regLastUse[i]) / 2 >= LraFFWindowSize) || (regLastUse[i] == 0))))
         {
             foundItem++;
         }
@@ -2163,7 +2161,7 @@ bool PhyRegsLocalRA::findFreeMultipleRegsBackward(int regIdx, BankAlign align, i
                 if (i + 1 <= endReg &&
                     isGRFAvailable(i + 1) && forbidden.find(i+1) ==forbidden.end() &&
                     (isWordBusy(i + 1, 0, lastRowSize) == false) &&
-                    (!isHybridAlloc || (((instID - regLastUse[i + 1]) / 2 >= FF_LRA_WINDOW_SIZE) || (regLastUse[i + 1] == 0))))
+                    (!isHybridAlloc || (((instID - regLastUse[i + 1]) / 2 >= LraFFWindowSize) || (regLastUse[i + 1] == 0))))
                 {
                     regnum = startReg;
                     return true;
@@ -2227,7 +2225,7 @@ bool PhyRegsLocalRA::findFreeSingleReg(int regIdx, int size, BankAlign align, G4
         }
 
         if (isGRFAvailable(i, 1) && forbidden.find(i) ==forbidden.end() &&
-            (!isHybridAlloc || (((instID - regLastUse[i]) / 2 >= FF_LRA_WINDOW_SIZE) || (regLastUse[i] == 0))))
+            (!isHybridAlloc || (((instID - regLastUse[i]) / 2 >= LraFFWindowSize) || (regLastUse[i] == 0))))
         {
             found = findFreeSingleReg(i, subalign, regnum, subregnum, size);
             if (found)

visa/LocalRA.h

@@ -288,6 +288,8 @@ class PhyRegsLocalRA
     bool r0Forbidden;
     bool r1Forbidden;
 
+    int LraFFWindowSize;
+
 public:
     PhyRegsLocalRA(IR_Builder* _builder, uint32_t nregs) : builder(_builder), numRegs(nregs)
     {
@@ -313,6 +315,7 @@ class PhyRegsLocalRA
         simpleGRFAvailable = false;
         r0Forbidden = false;
         r1Forbidden = false;
+       LraFFWindowSize = (int)builder->getOptions()->getuInt32Option(vISA_LraFFWindowSize);
     }
 
     void* operator new(size_t sz, Mem_Manager& m) {return m.alloc(sz);}

visa/include/VISAOptions.def

@@ -122,6 +122,7 @@ DEF_VISA_OPTION(vISA_AbortOnSpillThreshold, ET_INT32, NULLSTR, UNUSED, 0)
 DEF_VISA_OPTION(vISA_enableBCR, ET_BOOL, "-enableBCR",   UNUSED, false)
 DEF_VISA_OPTION(vISA_hierarchicaIPA, ET_BOOL, "-oldIPA", UNUSED, true)
 DEF_VISA_OPTION(vISA_IntrinsicSplit,       ET_BOOL, "-doSplit", UNUSED, false)
+DEF_VISA_OPTION(vISA_LraFFWindowSize,       ET_INT32, "-lraFFWindowSize", UNUSED, 12)
 
 DEF_VISA_OPTION(vISA_VerifyAugmentation,    ET_BOOL, "-verifyaugmentation", UNUSED, false)
 DEF_VISA_OPTION(vISA_VerifyExplicitSplit,   ET_BOOL, "-verifysplit", UNUSED, false)