GEP LSR: enable EnableGEPLSRUnknownConstantStep by default

Enables EnableGEPLSRUnknownConstantStep by default.

Author: pkwasnie-intel

IGC/common/igc_flags.h

@@ -315,7 +315,7 @@ DECLARE_IGC_REGKEY(DWORD, GEPLSRThresholdRatio, 100, "Ratio for register pressur
 DECLARE_IGC_REGKEY(bool, EnableGEPLSRToPreheader, true, "Enables reduction to loop's preheader in GEP Loop Strength Reduction pass", true)
 DECLARE_IGC_REGKEY(bool, EnableGEPLSRAnyIntBitWidth, false, "Enables reduction of SCEV with illegal integers. Requires legalization pass to clear up expanded code.", true)
 DECLARE_IGC_REGKEY(bool, EnableGEPLSRMulExpr, true, "Experimental: Enables reduction of SCEV with mul expression.", true)
-DECLARE_IGC_REGKEY(bool, EnableGEPLSRUnknownConstantStep, false, "Experimental: Enables reduction of SCEV with step expressed with constant value unknown at compilation time.", true)
+DECLARE_IGC_REGKEY(bool, EnableGEPLSRUnknownConstantStep, true, "Experimental: Enables reduction of SCEV with step expressed with constant value unknown at compilation time.", true)
 DECLARE_IGC_REGKEY(bool, PrintWaveClusteredInterleave, false, "(Debug) Print if WaveClusteredInterleave pattern was found.", true)
 DECLARE_IGC_REGKEY(DWORD, FPRoundingModeCoalescingMaxDistance, 20, "Max distance in instructions for reordering FP instructions with common rounding mode", false)
 DECLARE_IGC_REGKEY(bool, DisableDotAddToDp4aMerge, false, "Disable Dot and Add ops to Dp4a merge optimization.", false)