[AMDGPU] Enable "amdgpu-sw-lower-lds" pass in pipeline. (#89206)

This PR enables "amdgpu-sw-lower-lds" pass in the pipeline.
Also introduces "amdgpu-enable-sw-lower-lds" cmd line flag to
enbale/disable the pass.

Author: skc7

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

@@ -338,6 +338,12 @@ static cl::opt<bool> EnableScalarIRPasses(
   cl::init(true),
   cl::Hidden);
 
+static cl::opt<bool>
+    EnableSwLowerLDS("amdgpu-enable-sw-lower-lds",
+                     cl::desc("Enable lowering of lds to global memory pass "
+                              "and asan instrument resulting IR."),
+                     cl::init(true), cl::Hidden);
+
 static cl::opt<bool, true> EnableLowerModuleLDS(
     "amdgpu-enable-lower-module-lds", cl::desc("Enable lower module lds pass"),
     cl::location(AMDGPUTargetMachine::EnableLowerModuleLDS), cl::init(true),
@@ -759,6 +765,8 @@ void AMDGPUTargetMachine::registerPassBuilderCallbacks(PassBuilder &PB) {
         // We want to support the -lto-partitions=N option as "best effort".
         // For that, we need to lower LDS earlier in the pipeline before the
         // module is partitioned for codegen.
+        if (EnableSwLowerLDS)
+          PM.addPass(AMDGPUSwLowerLDSPass(*this));
         if (EnableLowerModuleLDS)
           PM.addPass(AMDGPULowerModuleLDSPass(*this));
 
@@ -1068,6 +1076,10 @@ void AMDGPUPassConfig::addIRPasses() {
   // Replace OpenCL enqueued block function pointers with global variables.
   addPass(createAMDGPUOpenCLEnqueuedBlockLoweringPass());
 
+  // Lower LDS accesses to global memory pass if address sanitizer is enabled.
+  if (EnableSwLowerLDS)
+    addPass(createAMDGPUSwLowerLDSLegacyPass(&TM));
+
   // Runs before PromoteAlloca so the latter can account for function uses
   if (EnableLowerModuleLDS) {
     addPass(createAMDGPULowerModuleLDSLegacyPass(&TM));

llvm/test/CodeGen/AMDGPU/llc-pipeline.ll

@@ -39,6 +39,7 @@
 ; GCN-O0-NEXT:        Basic Alias Analysis (stateless AA impl)
 ; GCN-O0-NEXT:        Function Alias Analysis Results
 ; GCN-O0-NEXT:    Lower OpenCL enqueued blocks
+; GCN-O0-NEXT:    AMDGPU Software lowering of LDS
 ; GCN-O0-NEXT:    Lower uses of LDS variables from non-kernel functions
 ; GCN-O0-NEXT:    FunctionPass Manager
 ; GCN-O0-NEXT:      Expand Atomic instructions
@@ -185,6 +186,7 @@
 ; GCN-O1-NEXT:        Basic Alias Analysis (stateless AA impl)
 ; GCN-O1-NEXT:        Function Alias Analysis Results
 ; GCN-O1-NEXT:    Lower OpenCL enqueued blocks
+; GCN-O1-NEXT:    AMDGPU Software lowering of LDS
 ; GCN-O1-NEXT:    Lower uses of LDS variables from non-kernel functions
 ; GCN-O1-NEXT:    FunctionPass Manager
 ; GCN-O1-NEXT:      Infer address spaces
@@ -460,6 +462,7 @@
 ; GCN-O1-OPTS-NEXT:        Basic Alias Analysis (stateless AA impl)
 ; GCN-O1-OPTS-NEXT:        Function Alias Analysis Results
 ; GCN-O1-OPTS-NEXT:    Lower OpenCL enqueued blocks
+; GCN-O1-OPTS-NEXT:    AMDGPU Software lowering of LDS
 ; GCN-O1-OPTS-NEXT:    Lower uses of LDS variables from non-kernel functions
 ; GCN-O1-OPTS-NEXT:    FunctionPass Manager
 ; GCN-O1-OPTS-NEXT:      Infer address spaces
@@ -765,6 +768,7 @@
 ; GCN-O2-NEXT:        Basic Alias Analysis (stateless AA impl)
 ; GCN-O2-NEXT:        Function Alias Analysis Results
 ; GCN-O2-NEXT:    Lower OpenCL enqueued blocks
+; GCN-O2-NEXT:    AMDGPU Software lowering of LDS
 ; GCN-O2-NEXT:    Lower uses of LDS variables from non-kernel functions
 ; GCN-O2-NEXT:    FunctionPass Manager
 ; GCN-O2-NEXT:      Infer address spaces
@@ -1074,6 +1078,7 @@
 ; GCN-O3-NEXT:        Basic Alias Analysis (stateless AA impl)
 ; GCN-O3-NEXT:        Function Alias Analysis Results
 ; GCN-O3-NEXT:    Lower OpenCL enqueued blocks
+; GCN-O3-NEXT:    AMDGPU Software lowering of LDS
 ; GCN-O3-NEXT:    Lower uses of LDS variables from non-kernel functions
 ; GCN-O3-NEXT:    FunctionPass Manager
 ; GCN-O3-NEXT:      Infer address spaces