Add a unittest to verify for assumption cache

[hiraditya]

rename test

[vsk]

llvm/unittests/Transforms/Utils/CodeExtractorTest.cpp

233

The extended string literal syntax would aid readability here, e.g.

const char* s1 = R"ir(
Hello
World
)ir";

[vsk]

Looks great, thanks!

llvm/unittests/Transforms/Utils/CodeExtractorTest.cpp

 //===- CodeExtractor.cpp - Unit tests for CodeExtractor -------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Transforms/Utils/CodeExtractor.h"
 #include "llvm/AsmParser/Parser.h"
+#include "llvm/Analysis/AssumptionCache.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Verifier.h"
 #include "llvm/IRReader/IRReader.h"
 #include "llvm/Support/SourceMgr.h"
TEST(CodeExtractor, StoreOutputInvokeResultInExitStub) {
   EXPECT_TRUE(CE.isEligible());
 
   Function *Outlined = CE.extractCodeRegion();
   EXPECT_TRUE(Outlined);
   EXPECT_FALSE(verifyFunction(*Outlined));
   EXPECT_FALSE(verifyFunction(*Func));
 }
 
+TEST(HotColdSplitting, ExtractAndInvalidateAssumptionCache) {
+  LLVMContext Ctx;
+  SMDiagnostic Err;
+  std::unique_ptr<Module> M(parseAssemblyString(R"ir(
+        target datalayout = \"e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128\"
+        target triple = \"aarch64\"
+
+        %b = type { i64 }
+        declare void @g(i8*)
+
+        declare void @llvm.assume(i1) #0
+
+        define void @test() {
+        entry:
+          br label %label
+
+        label:
+          %0 = load %b*, %b** inttoptr (i64 8 to %b**), align 8
+          %1 = getelementptr inbounds %b, %b* %0, i64 undef, i32 0
+          %2 = load i64, i64* %1, align 8
+          %3 = icmp ugt i64 %2, 1
+          br i1 %3, label %if.then, label %if.else
+
+        if.then:
+          unreachable
+
+        if.else:
+          call void @g(i8* undef)
+          store i64 undef, i64* null, align 536870912
+          %4 = icmp eq i64 %2, 0
+          call void @llvm.assume(i1 %4)
+          unreachable
+        }
+
+        attributes #0 = { nounwind willreturn }
+        )ir",
+        Err, Ctx));
+
+  assert(M && "Could not parse module?");
+  Function *Func = M->getFunction("test");
+  SmallVector<BasicBlock *, 1> Blocks{ getBlockByName(Func, "if.else") };
+  AssumptionCache AC(*Func);
+  CodeExtractor CE(Blocks, nullptr, false, nullptr, nullptr, &AC);
+  EXPECT_TRUE(CE.isEligible());
+
+  Function *Outlined = CE.extractCodeRegion();
+  EXPECT_TRUE(Outlined);
+  EXPECT_FALSE(verifyFunction(*Outlined));
+  EXPECT_FALSE(verifyFunction(*Func));
+  EXPECT_FALSE(CE.verifyAssumptionCache(*Func, &AC));
+}
 } // end anonymous namespace