Purge MTP Opt. Disabling Code

Recent modifications on this existing part are problematic, this change is to wipe out old code and prepare for a clean start.

Author: elvinw-intel

IGC/Compiler/CISACodeGen/EmitVISAPass.cpp

@@ -1388,20 +1388,6 @@ bool EmitPass::runOnFunction(llvm::Function& F)
         }
     }
 
-    if ((m_currShader->GetShaderType() == ShaderType::COMPUTE_SHADER ||
-        m_currShader->GetShaderType() == ShaderType::OPENCL_SHADER) &&
-        m_currShader->m_Platform->supportDisableMidThreadPreemptionSwitch() &&
-        IGC_IS_FLAG_ENABLED(EnableDisableMidThreadPreemptionOpt) &&
-        (m_currShader->GetContext()->m_instrTypes.numLoopInsts == 0) &&
-        (m_currShader->ProgramOutput()->m_InstructionCount < IGC_GET_FLAG_VALUE(MidThreadPreemptionDisableThreshold)))
-    {
-
-        {
-            COpenCLKernel* kernel = static_cast<COpenCLKernel*>(m_currShader);
-            kernel->SetDisableMidthreadPreemption();
-        }
-    }
-
     if (IGC_IS_FLAG_ENABLED(ForceBestSIMD))
     {
         return false;

IGC/Compiler/CISACodeGen/Platform.hpp

@@ -180,8 +180,6 @@ bool supportsWMTPForShaderType(ShaderType type) const {
     return false;
 }
 
-bool supportDisableMidThreadPreemptionSwitch() const { return m_platformInfo.eRenderCoreFamily >= IGFX_GEN10_CORE; }
-
 bool needSWStencil() const
 {
         return (m_platformInfo.eRenderCoreFamily == IGFX_GEN9_CORE && IGC_IS_FLAG_ENABLED(EnableSoftwareStencil));

IGC/common/igc_flags.h

@@ -705,8 +705,6 @@ DECLARE_IGC_REGKEY(bool, disableUnormTypedReadWA,       false, "disable software
 DECLARE_IGC_REGKEY(bool, forceGlobalRA,                 false, "force global register allocator", false)
 DECLARE_IGC_REGKEY(bool, disableVarSplit,               false, "disable variable splitting", false)
 DECLARE_IGC_REGKEY(bool, disableRemat,                  false, "disable re-materialization", false)
-DECLARE_IGC_REGKEY(bool, EnableDisableMidThreadPreemptionOpt, true, "Disable mid thread preemption", false)
-DECLARE_IGC_REGKEY(DWORD, MidThreadPreemptionDisableThreshold, 600, "Threshold to disable mid thread preemption", false)
 DECLARE_IGC_REGKEY(DWORD, DispatchGPGPUWalkerAlongYFirst, 1, "0 = No SW Y-walk, 1 = Dispatch GPGPU walker along Y first", false)
 DECLARE_IGC_REGKEY(DWORD, DispatchAlongY_XY_ratio,      0, "min threshold for thread group size x / y for dispatchAlongY", false)
 DECLARE_IGC_REGKEY(DWORD, DispatchAlongY_X_threshold,   0, "min threshold for thread group size x for dispatchAlongY", false)