Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/JumpThreading/thread-cmp.ll

@@ -1,69 +0,0 @@
-; RUN: opt -S -jump-threading %s | FileCheck %s
-; When simplify a branch based on LVI predicates, we should replace the 
-; comparison itself with a constant (when possible) in case it's otherwise used.
-
-define i32 @test(i32* %p) {
-; CHECK-LABEL: @test
-; CHECK: icmp eq
-; CHECK-NEXT: br i1 %cmp, label %exit2, label %exit1
-; CHECK-NOT: icmp ne
-entry:
-  %cmp = icmp eq i32* %p, null
-  br i1 %cmp, label %is_null, label %not_null
-is_null:
-  %cmp2 = icmp ne i32* %p, null
-  br i1 %cmp2, label %exit1, label %exit2
-not_null:
-  %cmp3 = icmp ne i32* %p, null
-  br i1 %cmp3, label %exit1, label %exit2
-exit1:
-  ret i32 0
-exit2:
-  ret i32 1
-}
-
-declare void @use(i1)
-
-; It would not be legal to replace %cmp2 (well, in this case it actually is, 
-; but that's a CSE problem, not a LVI/jump threading problem)
-define i32 @test_negative(i32* %p) {
-; CHECK-LABEL: @test
-; CHECK: icmp ne
-; CHECK: icmp eq
-; CHECK-NEXT: br i1 %cmp, label %exit2, label %exit1
-; CHECK-NOT: icmp ne
-entry:
-  %cmp2 = icmp ne i32* %p, null
-  call void @use(i1 %cmp2)
-  %cmp = icmp eq i32* %p, null
-  br i1 %cmp, label %is_null, label %not_null
-is_null:
-  br i1 %cmp2, label %exit1, label %exit2
-not_null:
-  br i1 %cmp2, label %exit1, label %exit2
-exit1:
-  ret i32 0
-exit2:
-  ret i32 1
-}
-
-; In this case, we can remove cmp2 because it's otherwise unused
-define i32 @test2(i32* %p) {
-; CHECK-LABEL: @test
-; CHECK-LABEL: entry:
-; CHECK-NEXT: icmp eq
-; CHECK-NEXT: br i1 %cmp, label %exit2, label %exit1
-; CHECK-NOT: icmp ne
-entry:
-  %cmp2 = icmp ne i32* %p, null
-  %cmp = icmp eq i32* %p, null
-  br i1 %cmp, label %is_null, label %not_null
-is_null:
-  br i1 %cmp2, label %exit1, label %exit2
-not_null:
-  br i1 %cmp2, label %exit1, label %exit2
-exit1:
-  ret i32 0
-exit2:
-  ret i32 1
-}