[LICM] Add test for PR57780 (NFC)

diff --git a/llvm/test/Transforms/LICM/pr57780.ll b/llvm/test/Transforms/LICM/pr57780.ll
new file mode 100644 (file)
index 0000000..89f48ed
--- /dev/null
+++ b/llvm/test/Transforms/LICM/pr57780.ll
@@ -0,0 +1,45 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -licm < %s | FileCheck %s
+
+@c = global i16 0, align 2
+
+; FIXME: The store should not be hoisted.
+define void @test() {
+; CHECK-LABEL: @test(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    store i16 5, ptr @c, align 2
+; CHECK-NEXT:    br label [[LOOP:%.*]]
+; CHECK:       loop:
+; CHECK-NEXT:    [[V:%.*]] = phi i32 [ 10, [[ENTRY:%.*]] ], [ 0, [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[V]], 0
+; CHECK-NEXT:    br i1 [[C]], label [[LOOP_EXIT:%.*]], label [[LOOP_CONT:%.*]]
+; CHECK:       loop.cont:
+; CHECK-NEXT:    br i1 false, label [[LOOP_IRREDUCIBLE:%.*]], label [[LOOP_LATCH]]
+; CHECK:       loop.irreducible:
+; CHECK-NEXT:    br label [[LOOP_LATCH]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    br i1 false, label [[LOOP_IRREDUCIBLE]], label [[LOOP]]
+; CHECK:       loop.exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop
+
+loop:                                             ; preds = %loop.latch, %entry
+  %v = phi i32 [ 10, %entry ], [ 0, %loop.latch ]
+  %c = icmp eq i32 %v, 0
+  br i1 %c, label %loop.exit, label %loop.cont
+
+loop.cont:                                        ; preds = %loop
+  br i1 false, label %loop.irreducible, label %loop.latch
+
+loop.irreducible:                                 ; preds = %loop.latch, %loop.cont
+  store i16 5, ptr @c, align 2
+  br label %loop.latch
+
+loop.latch:                                       ; preds = %loop.irreducible, %loop.cont
+  br i1 false, label %loop.irreducible, label %loop
+
+loop.exit:                                        ; preds = %loop
+  ret void
+}