Imported Upstream version 5.18.0.207

Former-commit-id: 3b152f462918d427ce18620a2cbe4f8b79650449

external/llvm/test/Transforms/JumpThreading/phi-known.ll

@@ -1,66 +0,0 @@
-; RUN: opt -S -jump-threading %s | FileCheck %s
-
-; Value of predicate known on all inputs (trivial case)
-; Note: InstCombine/EarlyCSE would also get this case
-define void @test(i8* %p, i8** %addr) {
-; CHECK-LABEL: @test
-entry:
-  %cmp0 = icmp eq i8* %p, null
-  br i1 %cmp0, label %exit, label %loop
-loop:
-; CHECK-LABEL: loop:
-; CHECK-NEXT: phi
-; CHECK-NEXT: br label %loop
-  %p1 = phi i8* [%p, %entry], [%p1, %loop]
-  %cmp1 = icmp eq i8* %p1, null
-  br i1 %cmp1, label %exit, label %loop
-exit:
-  ret void
-}
-
-; Value of predicate known on all inputs (non-trivial)
-define void @test2(i8* %p) {
-; CHECK-LABEL: @test2
-entry:
-  %cmp0 = icmp eq i8* %p, null
-  br i1 %cmp0, label %exit, label %loop
-loop:
-  %p1 = phi i8* [%p, %entry], [%p2, %backedge]
-  %cmp1 = icmp eq i8* %p1, null
-  br i1 %cmp1, label %exit, label %backedge
-backedge:
-; CHECK-LABEL: backedge:
-; CHECK-NEXT: phi
-; CHECK-NEXT: bitcast
-; CHECK-NEXT: load
-; CHECK-NEXT: cmp
-; CHECK-NEXT: br 
-; CHECK-DAG: label %backedge
-  %addr = bitcast i8* %p1 to i8**
-  %p2 = load i8*, i8** %addr
-  %cmp2 = icmp eq i8* %p2, null
-  br i1 %cmp2, label %exit, label %loop
-exit:
-  ret void
-}
-
-; If the inputs don't branch the same way, we can't rewrite
-; Well, we could unroll this loop exactly twice, but that's
-; a different transform.
-define void @test_mixed(i8* %p) {
-; CHECK-LABEL: @test_mixed
-entry:
-  %cmp0 = icmp eq i8* %p, null
-  br i1 %cmp0, label %exit, label %loop
-loop:
-; CHECK-LABEL: loop:
-; CHECK-NEXT: phi
-; CHECK-NEXT: %cmp1 = icmp
-; CHECK-NEXT: br i1 %cmp1
-  %p1 = phi i8* [%p, %entry], [%p1, %loop]
-  %cmp1 = icmp ne i8* %p1, null
-  br i1 %cmp1, label %exit, label %loop
-exit:
-  ret void
-}
-