Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/LoopDeletion/multiple-exits.ll

@@ -1,138 +0,0 @@
-; Checks whether dead loops with multiple exits can be eliminated.
-; Note that we loop simplify and LCSSA over the test cases to make sure the
-; critical components remain after those passes and are visible to the loop
-; deletion pass.
-;
-; RUN: opt < %s -loop-simplify -lcssa -S | FileCheck %s --check-prefixes=CHECK,BEFORE
-; RUN: opt < %s -loop-deletion -S | FileCheck %s --check-prefixes=CHECK,AFTER
-;
-; RUN: opt < %s -passes=no-op-loop -S | FileCheck %s --check-prefixes=CHECK,BEFORE
-; RUN: opt < %s -passes=loop-deletion -S | FileCheck %s --check-prefixes=CHECK,AFTER
-
-
-define void @foo(i64 %n, i64 %m) nounwind {
-; CHECK-LABEL: @foo(
-
-entry:
-  br label %bb
-; CHECK:       entry:
-; BEFORE-NEXT:   br label %bb
-; AFTER-NEXT:    br label %return
-
-bb:
-  %x.0 = phi i64 [ 0, %entry ], [ %t0, %bb2 ]
-  %t0 = add i64 %x.0, 1
-  %t1 = icmp slt i64 %x.0, %n
-  br i1 %t1, label %bb2, label %return
-; BEFORE:      bb:
-; BEFORE:        br i1 {{.*}}, label %bb2, label %return
-; AFTER-NOT:   bb:
-; AFTER-NOT:     br
-
-bb2:
-  %t2 = icmp slt i64 %x.0, %m
-  br i1 %t1, label %bb, label %return
-; BEFORE:      bb2:
-; BEFORE:        br i1 {{.*}}, label %bb, label %return
-; AFTER-NOT:   bb2:
-; AFTER-NOT:     br
-
-return:
-  ret void
-; CHECK:       return:
-; CHECK-NEXT:    ret void
-}
-
-define i64 @bar(i64 %n, i64 %m, i64 %maybe_zero) nounwind {
-; CHECK-LABEL: @bar(
-
-entry:
-  br label %bb
-; CHECK:       entry:
-; BEFORE-NEXT:   br label %bb
-; AFTER-NEXT:    br label %return
-
-bb:
-  %x.0 = phi i64 [ 0, %entry ], [ %t0, %bb3 ]
-  %t0 = add i64 %x.0, 1
-  %t1 = icmp slt i64 %x.0, %n
-  br i1 %t1, label %bb2, label %return
-; BEFORE:      bb:
-; BEFORE:        br i1 {{.*}}, label %bb2, label %return
-; AFTER-NOT:   bb:
-; AFTER-NOT:     br
-
-bb2:
-  %t2 = icmp slt i64 %x.0, %m
-  ; This unused division prevents unifying this loop exit path with others
-  ; because it can be deleted but cannot be hoisted.
-  %unused1 = udiv i64 42, %maybe_zero
-  br i1 %t2, label %bb3, label %return
-; BEFORE:      bb2:
-; BEFORE:        br i1 {{.*}}, label %bb3, label %return
-; AFTER-NOT:   bb2:
-; AFTER-NOT:     br
-
-bb3:
-  %t3 = icmp slt i64 %x.0, %m
-  ; This unused division prevents unifying this loop exit path with others
-  ; because it can be deleted but cannot be hoisted.
-  %unused2 = sdiv i64 42, %maybe_zero
-  br i1 %t3, label %bb, label %return
-; BEFORE:      bb3:
-; BEFORE:        br i1 {{.*}}, label %bb, label %return
-; AFTER-NOT:   bb3:
-; AFTER-NOT:     br
-
-return:
-  %x.lcssa = phi i64 [ 10, %bb ], [ 10, %bb2 ], [ 10, %bb3 ]
-  ret i64 %x.lcssa
-; CHECK:       return:
-; BEFORE-NEXT:   %[[X:.*]] = phi i64 [ 10, %bb ], [ 10, %bb2 ], [ 10, %bb3 ]
-; AFTER-NEXT:    %[[X:.*]] = phi i64 [ 10, %entry ]
-; CHECK-NEXT:    ret i64 %[[X]]
-}
-
-; This function has a loop which looks like @bar's but that cannot be deleted
-; because which path we exit through determines which value is selected.
-define i64 @baz(i64 %n, i64 %m, i64 %maybe_zero) nounwind {
-; CHECK-LABEL:  @baz(
-
-entry:
-  br label %bb
-; CHECK:       entry:
-; CHECK-NEXT:    br label %bb
-
-bb:
-  %x.0 = phi i64 [ 0, %entry ], [ %t0, %bb3 ]
-  %t0 = add i64 %x.0, 1
-  %t1 = icmp slt i64 %x.0, %n
-  br i1 %t1, label %bb2, label %return
-; CHECK:       bb:
-; CHECK:         br i1 {{.*}}, label %bb2, label %return
-
-bb2:
-  %t2 = icmp slt i64 %x.0, %m
-  ; This unused division prevents unifying this loop exit path with others
-  ; because it can be deleted but cannot be hoisted.
-  %unused1 = udiv i64 42, %maybe_zero
-  br i1 %t2, label %bb3, label %return
-; CHECK:       bb2:
-; CHECK:         br i1 {{.*}}, label %bb3, label %return
-
-bb3:
-  %t3 = icmp slt i64 %x.0, %m
-  ; This unused division prevents unifying this loop exit path with others
-  ; because it can be deleted but cannot be hoisted.
-  %unused2 = sdiv i64 42, %maybe_zero
-  br i1 %t3, label %bb, label %return
-; CHECK:       bb3:
-; CHECK:         br i1 {{.*}}, label %bb, label %return
-
-return:
-  %x.lcssa = phi i64 [ 12, %bb ], [ 10, %bb2 ], [ 10, %bb3 ]
-  ret i64 %x.lcssa
-; CHECK: return:
-; CHECK-NEXT:  %[[X:.*]] = phi i64 [ 12, %bb ], [ 10, %bb2 ], [ 10, %bb3 ]
-; CHECK-NEXT:  ret i64 %[[X]]
-}