Imported Upstream version 5.18.0.207

Former-commit-id: 3b152f462918d427ce18620a2cbe4f8b79650449

external/llvm/test/Transforms/GlobalOpt/invariant.group.barrier.ll

@@ -1,79 +0,0 @@
-; RUN: opt -S -globalopt < %s | FileCheck %s
-
-; This test is hint, what could globalOpt optimize and what it can't
-; FIXME: @tmp and @tmp2 can be safely set to 42
-; CHECK: @tmp = local_unnamed_addr global i32 0
-; CHECK: @tmp2 = local_unnamed_addr global i32 0
-; CHECK: @tmp3 = global i32 0
-
-@tmp = global i32 0
-@tmp2 = global i32 0
-@tmp3 = global i32 0
-@ptrToTmp3 = global i32* null
-
-@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
-
-define i32 @TheAnswerToLifeTheUniverseAndEverything() {
-  ret i32 42
-}
-
-define void @_GLOBAL__I_a() {
-enter:
-  call void @_optimizable()
-  call void @_not_optimizable()
-  ret void
-}
-
-define void @_optimizable() {
-enter:
-  %valptr = alloca i32
-  
-  %val = call i32 @TheAnswerToLifeTheUniverseAndEverything()
-  store i32 %val, i32* @tmp
-  store i32 %val, i32* %valptr
-  
-  %0 = bitcast i32* %valptr to i8*
-  %barr = call i8* @llvm.invariant.group.barrier(i8* %0)
-  %1 = bitcast i8* %barr to i32*
-  
-  %val2 = load i32, i32* %1
-  store i32 %val2, i32* @tmp2
-  ret void
-}
-
-; We can't step through invariant.group.barrier here, because that would change
-; this load in @usage_of_globals()
-; val = load i32, i32* %ptrVal, !invariant.group !0 
-; into 
-; %val = load i32, i32* @tmp3, !invariant.group !0
-; and then we could assume that %val and %val2 to be the same, which coud be 
-; false, because @changeTmp3ValAndCallBarrierInside() may change the value
-; of @tmp3.
-define void @_not_optimizable() {
-enter:
-  store i32 13, i32* @tmp3, !invariant.group !0
-  
-  %0 = bitcast i32* @tmp3 to i8*
-  %barr = call i8* @llvm.invariant.group.barrier(i8* %0)
-  %1 = bitcast i8* %barr to i32*
-  
-  store i32* %1, i32** @ptrToTmp3
-  store i32 42, i32* %1, !invariant.group !0
-  
-  ret void
-}
-define void @usage_of_globals() {
-entry:
-  %ptrVal = load i32*, i32** @ptrToTmp3
-  %val = load i32, i32* %ptrVal, !invariant.group !0
-  
-  call void @changeTmp3ValAndCallBarrierInside()
-  %val2 = load i32, i32* @tmp3, !invariant.group !0
-  ret void;
-}
-
-declare void @changeTmp3ValAndCallBarrierInside()
-
-declare i8* @llvm.invariant.group.barrier(i8*)
-
-!0 = !{!"something"}