Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/test/CodeGen/Hexagon/hwloop-wrap.ll

@@ -0,0 +1,22 @@
+; RUN: llc -march=hexagon -mcpu=hexagonv5 < %s | FileCheck %s
+
+; We shouldn't generate a hardware loop in this case because the initial
+; value may be zero, which means the endloop instruction will not decrement
+; the loop counter, and the loop will execute only once.
+
+; CHECK-NOT: loop0
+
+define void @foo(i32 %count, i32 %v) #0 {
+entry:
+  br label %do.body
+
+do.body:
+  %count.addr.0 = phi i32 [ %count, %entry ], [ %dec, %do.body ]
+  tail call void asm sideeffect "nop", ""() #1
+  %dec = add i32 %count.addr.0, -1
+  %cmp = icmp eq i32 %dec, 0
+  br i1 %cmp, label %do.end, label %do.body
+
+do.end:
+  ret void
+}