Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/EarlyCSE/invariant.start.ll

@@ -1,71 +0,0 @@
-; RUN: opt < %s -S -early-cse | FileCheck %s
-; RUN: opt < %s -S -passes=early-cse | FileCheck %s
-
-declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) nounwind readonly
-declare void @llvm.invariant.end.p0i8({}*, i64, i8* nocapture) nounwind
-
-; Check that we do load-load forwarding over invariant.start, since it does not
-; clobber memory
-define i8 @test1(i8 *%P) {
-  ; CHECK-LABEL: @test1(
-  ; CHECK-NEXT: %V1 = load i8, i8* %P
-  ; CHECK-NEXT: %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %P)
-  ; CHECK-NEXT: ret i8 0
-
-
-  %V1 = load i8, i8* %P
-  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %P)
-  %V2 = load i8, i8* %P
-  %Diff = sub i8 %V1, %V2
-  ret i8 %Diff
-}
-
-
-; Trivial Store->load forwarding over invariant.start
-define i8 @test2(i8 *%P) {
-  ; CHECK-LABEL: @test2(
-  ; CHECK-NEXT: store i8 42, i8* %P
-  ; CHECK-NEXT: %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %P)
-  ; CHECK-NEXT: ret i8 42
-
-
-  store i8 42, i8* %P
-  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %P)
-  %V1 = load i8, i8* %P
-  ret i8 %V1
-}
-
-; We can DSE over invariant.start calls, since the first store to
-; %P is valid, and the second store is actually unreachable based on semantics
-; of invariant.start.
-define void @test3(i8* %P) {
-
-; CHECK-LABEL: @test3(
-; CHECK-NEXT:  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %P)
-; CHECK-NEXT:  store i8 60, i8* %P
-
-
-  store i8 50, i8* %P
-  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %P)
-  store i8 60, i8* %P
-  ret void
-}
-
-
-; FIXME: Now the first store can actually be eliminated, since there is no read within
-; the invariant region, between start and end.
-define void @test4(i8* %P) {
-
-; CHECK-LABEL: @test4(
-; CHECK-NEXT: store i8 50, i8* %P
-; CHECK-NEXT:  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %P)
-; CHECK-NEXT: call void @llvm.invariant.end.p0i8({}* %i, i64 1, i8* %P)
-; CHECK-NEXT:  store i8 60, i8* %P
-
-
-  store i8 50, i8* %P
-  %i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %P)
-  call void @llvm.invariant.end.p0i8({}* %i, i64 1, i8* %P)
-  store i8 60, i8* %P
-  ret void
-}