Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/test/Analysis/ScalarEvolution/infer-via-ranges.ll

@@ -0,0 +1,30 @@
+; RUN: opt -indvars -S < %s | FileCheck %s
+
+define void @infer_via_ranges(i32 *%arr, i32 %n) {
+; CHECK-LABEL: @infer_via_ranges
+ entry:
+  %first.itr.check = icmp sgt i32 %n, 0
+  %start = sub i32 %n, 1
+  br i1 %first.itr.check, label %loop, label %exit
+
+ loop:
+; CHECK-LABEL: loop:
+  %idx = phi i32 [ %start, %entry ] , [ %idx.dec, %in.bounds ]
+  %idx.dec = sub i32 %idx, 1
+  %abc = icmp sge i32 %idx, 0
+; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
+  br i1 %abc, label %in.bounds, label %out.of.bounds
+
+ in.bounds:
+; CHECK-LABEL: in.bounds:
+  %addr = getelementptr i32, i32* %arr, i32 %idx
+  store i32 0, i32* %addr
+  %next = icmp sgt i32 %idx.dec, -1
+  br i1 %next, label %loop, label %exit
+
+ out.of.bounds:
+  ret void
+
+ exit:
+  ret void
+}