Disable scheduler when compiling without optimizations.

Change-Id: Ie65aef1a7e5fd525f1ca890fb48a02fd1b79c928

Author: stanleygambarin

IGC/VectorCompiler/lib/GenXCodeGen/GenXCisaBuilder.cpp

@@ -5753,7 +5753,9 @@ ModulePass *llvm::createGenXFinalizerPass(raw_pwrite_stream &o) {
 
 static SmallVector<const char *, 8>
 collectFinalizerArgs(StringSaver &Saver, const GenXSubtarget &ST,
-                     const bool EnableKernelDebug, const bool AsmDumpsEnabled) {
+                     const bool EnableKernelDebug,
+                     const bool AsmDumpsEnabled,
+                     const bool OptimizationDisabled) {
   SmallVector<const char *, 8> Argv;
   auto addArgument = [&Argv, &Saver](StringRef Arg) {
     // String saver guarantees that string is null-terminated.
@@ -5774,6 +5776,9 @@ collectFinalizerArgs(StringSaver &Saver, const GenXSubtarget &ST,
     addArgument("-output");
     addArgument("-binary");
   }
+  if (OptimizationDisabled) {
+    addArgument("-noschedule");
+  }
   return Argv;
 }
 
@@ -5795,6 +5800,7 @@ LLVMContext &GenXModule::getContext() {
 static VISABuilder *createVISABuilder(const GenXSubtarget &ST,
                                       const bool EnableKernelDebug,
                                       const bool AsmDumpsEnabled,
+                                      const bool OptimizationDisabled,
                                       vISABuilderMode Mode, WA_TABLE *WaTable,
                                       LLVMContext &Ctx,
                                       BumpPtrAllocator &Alloc) {
@@ -5806,7 +5812,8 @@ static VISABuilder *createVISABuilder(const GenXSubtarget &ST,
   // Prepare array of arguments for Builder API.
   StringSaver Saver{Alloc};
   SmallVector<const char *, 8> Argv =
-      collectFinalizerArgs(Saver, ST, EnableKernelDebug, AsmDumpsEnabled);
+      collectFinalizerArgs(Saver, ST, EnableKernelDebug,
+          AsmDumpsEnabled, OptimizationDisabled);
 
   if (PrintFinalizerOptions)
     dumpFinalizerArgs(Argv, ST.getCPU());
@@ -5822,9 +5829,13 @@ static VISABuilder *createVISABuilder(const GenXSubtarget &ST,
 
 void GenXModule::InitCISABuilder() {
   IGC_ASSERT(ST);
+  GenXTargetMachine *TM = &getAnalysis<TargetPassConfig>()
+                              .getTM<GenXTargetMachine>();
+  const bool OptimizationDisabled = TM->getOptLevel() == CodeGenOpt::None;
   const vISABuilderMode Mode = HasInlineAsm() ? vISA_ASM_WRITER : vISA_MEDIA;
-  CisaBuilder = createVISABuilder(*ST, EnableKernelDebug, AsmDumpsEnabled, Mode,
-                                  WaTable, getContext(), ArgStorage);
+  CisaBuilder = createVISABuilder(*ST, EnableKernelDebug, AsmDumpsEnabled,
+                                  OptimizationDisabled, Mode, WaTable,
+                                  getContext(), ArgStorage);
 }
 
 VISABuilder *GenXModule::GetCisaBuilder() {
@@ -5844,7 +5855,9 @@ void GenXModule::InitVISAAsmReader() {
   IGC_ASSERT(ST);
   VISAAsmTextReader =
       createVISABuilder(*ST, EnableKernelDebug, AsmDumpsEnabled,
-                        vISA_ASM_READER, WaTable, getContext(), ArgStorage);
+                        /*OptimizationDisabled*/false,
+                        vISA_ASM_READER, WaTable,
+                        getContext(), ArgStorage);
 }
 
 VISABuilder *GenXModule::GetVISAAsmReader() {