* Fix ptr.to.pair when src is uniform but dst is not.

* Bail on MatchRegionPattern if vstride would be too large.

Change-Id: Ia33e79c40aef9fd468263fa7989b4bb003ddc1df

Author: scottp101

IGC/Compiler/CISACodeGen/EmitVISAPass.cpp

@@ -2106,7 +2106,8 @@ void EmitPass::EmitPtrToPair(GenIntrinsicInst* GII, const SSource Sources[1], co
             m_encoder->Push();
         }
         else {
-            m_encoder->SetSrcRegion(0, 2, 1, 0);
+            if (!Src->IsUniform())
+                m_encoder->SetSrcRegion(0, 2, 1, 0);
             m_encoder->SetSrcSubReg(0, 0);
             m_encoder->Copy(Lo, Src);
             m_encoder->Push();
@@ -2120,7 +2121,8 @@ void EmitPass::EmitPtrToPair(GenIntrinsicInst* GII, const SSource Sources[1], co
             m_encoder->Push();
         }
         else {
-            m_encoder->SetSrcRegion(0, 2, 1, 0);
+            if (!Src->IsUniform())
+                m_encoder->SetSrcRegion(0, 2, 1, 0);
             m_encoder->SetSrcSubReg(0, 1);
             m_encoder->Copy(Hi, Src);
             m_encoder->Push();

IGC/Compiler/CISACodeGen/PatternMatchPass.cpp

@@ -4044,9 +4044,9 @@ namespace IGC
                     //Check to make sure we dont end up with an invalid Vertical Stride.
                     //Only 1, 2, 4, 8, 16 are supported.
                     if (shiftFactor <= 4)
-                    {
-                        verticalStride = (int)pow(2, shiftFactor);
-                    }
+                        verticalStride = (1U << shiftFactor);
+                    else
+                        return false;
                 }
             }
         }