[NFC] New test case for BasicAA and memcy/memmove with deopt

[ebrevnov]

Summary

New test checks results of BasicAA for llvm.memcpy.*/llvm.memmove.* intrinsics in presence of deopt bundle. By specification expected result for unrelated global memory should be Ref. Currently this is not the case and will be fixed in upcoming patches.

[fhahn]

LGTM, thanks!

llvm/test/Analysis/BasicAA/deoptimize.ll

 ; RUN: opt < %s -basic-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
 target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
 
-declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) #0
+@G1 = external global i32
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1)
+declare void @llvm.memmove.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1)
 declare void @llvm.experimental.deoptimize.void(...)
 declare void @unknown_but_readonly() readonly
 
 define void @test1(i8* %p) {
   call void(...) @llvm.experimental.deoptimize.void() [ "deopt"() ]
   ret void
 
 ; CHECK-LABEL: Function: test1:
 ; CHECK:  Just Ref: Ptr: i8* %p <-> call void (...) @llvm.experimental.deoptimize.isVoid() [ "deopt"() ]
 }
+
+; By specification calls with deopt bundles reads through all operands and entire heap.
+; Check that global G1 is reported as Ref by memcpy/memmove calls.
+define i32 @test_memcpy_with_deopt() {
+; CHECK-LABEL: Function: test_memcpy_with_deopt:
+; CHECK: Just Mod:  Ptr: i8* %A <->  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
+; CHECK: Just Ref:  Ptr: i8* %B <->  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
+; CHECK: NoModRef:  Ptr: i32* @G1 <->  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
+
+  %A = alloca i8
+  %B = alloca i8
+
+  store i32 2, i32* @G1  ;; Not referenced by semantics of memcpy but still may be read due to "deopt"
+
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
+
+  %C = load i32, i32* @G1
+  ret i32 %C
+}
+
+define i32 @test_memmove_with_deopt() {
+; CHECK-LABEL: Function: test_memmove_with_deopt:
+; CHECK: Just Mod:  Ptr: i8* %A <->  call void @llvm.memmove.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
+; CHECK: Just Ref:  Ptr: i8* %B <->  call void @llvm.memmove.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
+; CHECK: Both ModRef:  Ptr: i32* @G1  <->  call void @llvm.memmove.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
+
+  %A = alloca i8
+  %B = alloca i8
+
+  store i32 2, i32* @G1  ;; Not referenced by semantics of memcpy but still may be read due to "deopt"
+
+  call void @llvm.memmove.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
+
+  %C = load i32, i32* @G1
+  ret i32 %C
+}