Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Analysis/BlockFrequencyInfo/extremely-likely-loop-successor.ll

@@ -0,0 +1,41 @@
+; RUN: opt < %s -analyze -block-freq | FileCheck %s
+; RUN: opt < %s -passes='print<block-freq>' -disable-output 2>&1 | FileCheck %s
+
+; PR21622: Check for a crasher when the sum of exits to the same successor of a
+; loop overflows.
+
+; CHECK-LABEL: Printing analysis {{.*}} for function 'extremely_likely_loop_successor':
+; CHECK-NEXT: block-frequency-info: extremely_likely_loop_successor
+define void @extremely_likely_loop_successor() {
+; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
+entry:
+  br label %loop
+
+; CHECK-NEXT: loop: float = 1.0,
+loop:
+  %exit.1.cond = call i1 @foo()
+  br i1 %exit.1.cond, label %exit, label %loop.2, !prof !0
+
+; CHECK-NEXT: loop.2: float = 0.0000000
+loop.2:
+  %exit.2.cond = call i1 @foo()
+  br i1 %exit.2.cond, label %exit, label %loop.3, !prof !0
+
+; CHECK-NEXT: loop.3: float = 0.0000000
+loop.3:
+  %exit.3.cond = call i1 @foo()
+  br i1 %exit.3.cond, label %exit, label %loop.4, !prof !0
+
+; CHECK-NEXT: loop.4: float = 0.0,
+loop.4:
+  %exit.4.cond = call i1 @foo()
+  br i1 %exit.4.cond, label %exit, label %loop, !prof !0
+
+; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]]
+exit:
+  ret void
+}
+
+declare i1 @foo()
+
+!0 = !{!"branch_weights", i32 4294967295, i32 1}