[Inline][Cloning] Introduce test for PR87963 (NFC)

Author: antoniofrighetto

llvm/test/Transforms/Inline/inline-deferred-instsimplify.ll

@@ -0,0 +1,76 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt < %s -passes=inline -S | FileCheck %s
+; RUN: opt < %s -passes='cgscc(inline)' -S | FileCheck %s
+
+%struct.a = type { i32, i32, i32, i32, i32 }
+
+@g_var = global %struct.a { i32 1, i32 0, i32 0, i32 0, i32 0 }, align 8
+@other_g_var = global %struct.a zeroinitializer, align 4
+
+define void @callee(ptr noundef byval(%struct.a) align 8 %ptr) {
+; CHECK-LABEL: define void @callee(
+; CHECK-SAME: ptr noundef byval([[STRUCT_A:%.*]]) align 8 [[PTR:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[VAL:%.*]] = load i32, ptr [[PTR]], align 8
+; CHECK-NEXT:    [[DOTNOT:%.*]] = icmp eq i32 [[VAL]], 0
+; CHECK-NEXT:    br i1 [[DOTNOT]], label [[CHECK_POINTERS_ARE_EQUAL:%.*]], label [[STORE_PTR_IN_GVAR:%.*]]
+; CHECK:       store_ptr_in_gvar:
+; CHECK-NEXT:    store ptr [[PTR]], ptr @other_g_var, align 8
+; CHECK-NEXT:    br label [[CHECK_POINTERS_ARE_EQUAL]]
+; CHECK:       check_pointers_are_equal:
+; CHECK-NEXT:    [[PHI:%.*]] = phi ptr [ [[PTR]], [[STORE_PTR_IN_GVAR]] ], [ @other_g_var, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    [[DOTNOT1:%.*]] = icmp eq ptr [[PHI]], [[PTR]]
+; CHECK-NEXT:    br i1 [[DOTNOT1]], label [[RETURN:%.*]], label [[ABORT:%.*]]
+; CHECK:       abort:
+; CHECK-NEXT:    call void @abort()
+; CHECK-NEXT:    unreachable
+; CHECK:       return:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %val = load i32, ptr %ptr, align 8
+  %.not = icmp eq i32 %val, 0
+  br i1 %.not, label %check_pointers_are_equal, label %store_ptr_in_gvar
+
+store_ptr_in_gvar:                                ; preds = %entry
+  store ptr %ptr, ptr @other_g_var, align 8
+  br label %check_pointers_are_equal
+
+check_pointers_are_equal:                         ; preds = %store_ptr_in_gvar, %entry
+  %phi = phi ptr [ %ptr, %store_ptr_in_gvar ], [ @other_g_var, %entry ]
+; FIXME: While inlining, the following is miscompiled to i1 false,
+; as %ptr in the phi-node is not taken into account.
+  %.not1 = icmp eq ptr %phi, %ptr
+  br i1 %.not1, label %return, label %abort
+
+abort:                                            ; preds = %check_pointers_are_equal
+  call void @abort()
+  unreachable
+
+return:                                           ; preds = %check_pointers_are_equal
+  ret void
+}
+
+define i32 @main() {
+; CHECK-LABEL: define i32 @main() {
+; CHECK-NEXT:    [[G_VAR:%.*]] = alloca [[STRUCT_A:%.*]], align 8
+; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 20, ptr [[G_VAR]])
+; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i64(ptr align 1 [[G_VAR]], ptr align 1 @g_var, i64 20, i1 false)
+; CHECK-NEXT:    [[VAL_I:%.*]] = load i32, ptr [[G_VAR]], align 8
+; CHECK-NEXT:    [[DOTNOT_I:%.*]] = icmp eq i32 [[VAL_I]], 0
+; CHECK-NEXT:    br i1 [[DOTNOT_I]], label [[CHECK_POINTERS_ARE_EQUAL_I:%.*]], label [[STORE_PTR_IN_GVAR_I:%.*]]
+; CHECK:       store_ptr_in_gvar.i:
+; CHECK-NEXT:    store ptr [[G_VAR]], ptr @other_g_var, align 8
+; CHECK-NEXT:    br label [[CHECK_POINTERS_ARE_EQUAL_I]]
+; CHECK:       check_pointers_are_equal.i:
+; CHECK-NEXT:    [[PHI_I:%.*]] = phi ptr [ [[G_VAR]], [[STORE_PTR_IN_GVAR_I]] ], [ @other_g_var, [[TMP0:%.*]] ]
+; CHECK-NEXT:    call void @abort()
+; CHECK-NEXT:    unreachable
+; CHECK:       callee.exit:
+; CHECK-NEXT:    ret i32 0
+;
+  call void @callee(ptr noundef byval(%struct.a) align 8 @g_var)
+  ret i32 0
+}
+
+declare void @abort()