Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/CodeGen/X86/branchfolding-landingpads.ll

@@ -0,0 +1,45 @@
+; RUN: llc %s -o - -verify-machineinstrs | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-unknown"
+
+; The machine level BranchFolding pass will try to remove the 'unreachable' block
+; and rewrite 'entry' to jump to the block 'unreachable' falls through to.
+; That will be a landing pad and result in 'entry' jumping to 2 landing pads.
+; This tests that we don't do this change when the fallthrough is itself a landing
+; pad.
+
+declare i32 @__gxx_personality_v0(...)
+declare void @foo()
+
+; Function Attrs: noreturn
+declare void @_throw()
+
+; CHECK-LABEL: @main
+; CHECK: %unreachable
+
+define i32 @main(i8* %cleanup) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+entry:
+  invoke void @_throw() #0
+          to label %unreachable unwind label %catch.dispatch9
+
+catch.dispatch9:                                  ; preds = %entry
+  %tmp13 = landingpad { i8*, i32 }
+          cleanup
+          catch i8* null
+  invoke void @_throw() #0
+          to label %unreachable unwind label %lpad31
+
+lpad31:                                           ; preds = %catch.dispatch9
+  %tmp20 = landingpad { i8*, i32 }
+          cleanup
+          catch i8* null
+  call void @foo()
+  unreachable
+
+unreachable:                                      ; preds = %catch.dispatch9, %entry
+  unreachable
+}
+
+attributes #0 = { noreturn }
+