Imported Upstream version 5.18.0.225

Former-commit-id: 10196d987d5fc5564b9d3b33b1fdf13190f4d0b5

external/llvm/test/Transforms/Sink/fence.ll

@@ -0,0 +1,28 @@
+; RUN: opt -S -sink < %s | FileCheck %s
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @test1(i32* ()*) {
+entry:
+  %1 = call i32* %0() #0
+  fence syncscope("singlethread") seq_cst
+  %2 = load i32, i32* %1, align 4
+  fence syncscope("singlethread") seq_cst
+  %3 = icmp eq i32 %2, 0
+  br i1 %3, label %fail, label %pass
+
+fail:                                             ; preds = %top
+  br label %pass
+
+pass:                                             ; preds = %fail, %top
+  ret void
+}
+
+; CHECK-LABEL: @test1(
+; CHECK:  %[[call:.*]] = call i32* %0()
+; CHECK:  fence syncscope("singlethread") seq_cst
+; CHECK:  load i32, i32* %[[call]], align 4
+; CHECK:  fence syncscope("singlethread") seq_cst
+
+
+attributes #0 = { nounwind readnone }