replace greedy pattern rewrites with partial conversions

better failure messages

src/PIM/Pass/PimCodegen/EmitPimCodePass.cpp

@@ -24,8 +24,11 @@ struct EmitPimCodePass : PassWrapper<EmitPimCodePass, OperationPass<ModuleOp>> {
     createDirectory(pimDir);
 
     int compiler_error_code = compileToPimCode(moduleOp, pimDir);
-    if (compiler_error_code != CompilerSuccess)
+    if (compiler_error_code != CompilerSuccess) {
+      moduleOp.emitError() << "failed to emit PIM simulator code artifacts; compiler error code "
+                           << compiler_error_code;
       signalPassFailure();
+    }
   }
 };
 

src/PIM/Pass/PimCodegen/HostConstantFolding/HostConstantFoldingPass.cpp

@@ -32,14 +32,16 @@ struct HostConstantFoldingPass : PassWrapper<HostConstantFoldingPass, OperationP
   }
 
   void runOnOperation() override {
+    ModuleOp moduleOp = getOperation();
     GreedyRewriteConfig config;
     config.enableFolding();
-    if (failed(applyPatternsGreedily(getOperation(), *patterns, config))) {
+    if (failed(applyPatternsGreedily(moduleOp, *patterns, config))) {
+      moduleOp.emitError("PIM host constant folding failed in the greedy rewrite driver");
       signalPassFailure();
       return;
     }
 
-    dumpModule(getOperation(), "pim3_folded");
+    dumpModule(moduleOp, "pim3_folded");
   }
 
   std::shared_ptr<const FrozenRewritePatternSet> patterns;

src/PIM/Pass/PimCodegen/MaterializeHostConstantsPass.cpp

@@ -160,6 +160,7 @@ struct MaterializeHostConstantsPass : PassWrapper<MaterializeHostConstantsPass,
     }
 
     if (hasFailure) {
+      moduleOp.emitError("PIM host-constant materialization failed; see diagnostics above");
       signalPassFailure();
       return;
     }

src/PIM/Pass/PimCodegen/VerificationPass.cpp

@@ -197,8 +197,10 @@ struct VerificationPass : PassWrapper<VerificationPass, OperationPass<ModuleOp>>
       }
     }
 
-    if (hasFailure)
+    if (hasFailure) {
+      moduleOp.emitError("PIM codegen verification failed; see diagnostics above");
       signalPassFailure();
+    }
   }
 
 private: