Add a test to ensure that dxil-embed removes lifetimes

Author: Icohedron

llvm/test/CodeGen/DirectX/legalize-lifetimes-valver-1.6.ll

@@ -1,21 +1,27 @@
 ; RUN: opt -S -passes='dxil-op-lower' -mtriple=dxil-pc-shadermodel6.3-library %s | FileCheck %s --check-prefixes=CHECK,CHECK-SM63
 ; RUN: opt -S -passes='dxil-op-lower' -mtriple=dxil-pc-shadermodel6.6-library %s | FileCheck %s --check-prefixes=CHECK,CHECK-SM66
+; RUN: opt -S -dxil-prepare -dxil-embed -mtriple=dxil-pc-shadermodel6.6-library %s | FileCheck %s --check-prefixes=CHECK,CHECK-EMBED
+
+; Lifetime intrinsics are not valid prior to shader model 6.6 and are instead
+; replaced with undef stores, provided the validator version is 1.6 or greater
+
+; The dxil-embed pass will remove lifetime intrinsics because they transformed
+; in a way that is illegal in modern LLVM IR before serializing to DXIL bitcode.
+; So we check that no bitcast or lifetime intrinsics remain after dxil-embed
 
 ; CHECK-LABEL: define void @test_legal_lifetime() {
-; 
-; CHECK-SM63-NEXT:    [[ACCUM_I_FLAT:%.*]] = alloca [1 x i32], align 4
-; CHECK-SM63-NEXT:    [[GEP:%.*]] = getelementptr i32, ptr [[ACCUM_I_FLAT]], i32 0
-; CHECK-SM63-NEXT:    store [1 x i32] undef, ptr [[ACCUM_I_FLAT]], align 4
-; CHECK-SM63-NEXT:    store i32 0, ptr [[GEP]], align 4
-; CHECK-SM63-NEXT:    store [1 x i32] undef, ptr [[ACCUM_I_FLAT]], align 4
-; 
-; CHECK-SM66-NEXT:    [[ACCUM_I_FLAT:%.*]] = alloca [1 x i32], align 4
-; CHECK-SM66-NEXT:    [[GEP:%.*]] = getelementptr i32, ptr [[ACCUM_I_FLAT]], i32 0
-; CHECK-SM66-NEXT:    call void @llvm.lifetime.start.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
-; CHECK-SM66-NEXT:    store i32 0, ptr [[GEP]], align 4
-; CHECK-SM66-NEXT:    call void @llvm.lifetime.end.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
-; 
-; CHECK-NEXT:    ret void
+; CHECK-NEXT:       [[ACCUM_I_FLAT:%.*]] = alloca [1 x i32], align 4
+; CHECK-NEXT:       [[GEP:%.*]] = getelementptr i32, ptr [[ACCUM_I_FLAT]], i32 0
+; CHECK-SM63-NEXT:  store [1 x i32] undef, ptr [[ACCUM_I_FLAT]], align 4
+; CHECK-SM66-NEXT:  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
+; CHECK-EMBED-NOT:  bitcast
+; CHECK-EMBED-NOT:  lifetime
+; CHECK-NEXT:       store i32 0, ptr [[GEP]], align 4
+; CHECK-SM63-NEXT:  store [1 x i32] undef, ptr [[ACCUM_I_FLAT]], align 4
+; CHECK-SM66-NEXT:  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull [[ACCUM_I_FLAT]])
+; CHECK-EMBED-NOT:  bitcast
+; CHECK-EMBED-NOT:  lifetime
+; CHECK-NEXT:       ret void
 ;
 define void @test_legal_lifetime()  {
   %accum.i.flat = alloca [1 x i32], align 4