Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/GVN/PRE/pre-single-pred.ll

@@ -1,45 +0,0 @@
-; RUN: opt < %s -gvn -enable-load-pre -S | FileCheck %s
-; This testcase assumed we'll PRE the load into %for.cond, but we don't actually
-; verify that doing so is safe.  If there didn't _happen_ to be a load in
-; %for.end, we would actually be lengthening the execution on some paths, and
-; we were never actually checking that case.  Now we actually do perform some
-; conservative checking to make sure we don't make paths longer, but we don't
-; currently get this case, which we got lucky on previously.
-;
-; Now that that faulty assumption is corrected, test that we DON'T incorrectly
-; hoist the load.  Doing the right thing for the wrong reasons is still a bug.
-
-@p = external global i32
-define i32 @f(i32 %n) nounwind {
-entry:
-	br label %for.cond
-
-for.cond:		; preds = %for.inc, %entry
-	%i.0 = phi i32 [ 0, %entry ], [ %indvar.next, %for.inc ]		; <i32> [#uses=2]
-	%cmp = icmp slt i32 %i.0, %n		; <i1> [#uses=1]
-	br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
-
-for.cond.for.end_crit_edge:		; preds = %for.cond
-	br label %for.end
-
-; CHECK: for.body:
-; CHECK-NEXT: %tmp3 = load i32, i32* @p
-for.body:		; preds = %for.cond
-	%tmp3 = load i32, i32* @p		; <i32> [#uses=1]
-	%dec = add i32 %tmp3, -1		; <i32> [#uses=2]
-	store i32 %dec, i32* @p
-	%cmp6 = icmp slt i32 %dec, 0		; <i1> [#uses=1]
-	br i1 %cmp6, label %for.body.for.end_crit_edge, label %for.inc
-
-; CHECK: for.body.for.end_crit_edge:
-for.body.for.end_crit_edge:		; preds = %for.body
-	br label %for.end
-
-for.inc:		; preds = %for.body
-	%indvar.next = add i32 %i.0, 1		; <i32> [#uses=1]
-	br label %for.cond
-
-for.end:		; preds = %for.body.for.end_crit_edge, %for.cond.for.end_crit_edge
-	%tmp9 = load i32, i32* @p		; <i32> [#uses=1]
-	ret i32 %tmp9
-}