Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Analysis/GlobalsModRef/memset-escape.ll

@@ -0,0 +1,65 @@
+; RUN: opt < %s -O1 -S | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+@a = internal global [3 x i32] zeroinitializer, align 4
+@b = common global i32 0, align 4
+
+; The important thing we're checking for here is the reload of (some element of)
+; @a after the memset.
+
+; CHECK-LABEL: @main
+; CHECK: call void @llvm.memset.p0i8.i64{{.*}} @a
+; CHECK: store i32 3
+; CHECK: load i32, i32* getelementptr {{.*}} @a
+; CHECK: icmp eq i32
+; CHECK: br i1
+
+define i32 @main() {
+entry:
+  %retval = alloca i32, align 4
+  %c = alloca [1 x i32], align 4
+  store i32 0, i32* %retval, align 4
+  %0 = bitcast [1 x i32]* %c to i8*
+  call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 4, i32 4, i1 false)
+  store i32 1, i32* getelementptr inbounds ([3 x i32], [3 x i32]* @a, i64 0, i64 2), align 4
+  store i32 0, i32* @b, align 4
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.inc, %entry
+  %1 = load i32, i32* @b, align 4
+  %cmp = icmp slt i32 %1, 3
+  br i1 %cmp, label %for.body, label %for.end
+
+for.body:                                         ; preds = %for.cond
+  %2 = load i32, i32* @b, align 4
+  %idxprom = sext i32 %2 to i64
+  %arrayidx = getelementptr inbounds [3 x i32], [3 x i32]* @a, i64 0, i64 %idxprom
+  store i32 0, i32* %arrayidx, align 4
+  br label %for.inc
+
+for.inc:                                          ; preds = %for.body
+  %3 = load i32, i32* @b, align 4
+  %inc = add nsw i32 %3, 1
+  store i32 %inc, i32* @b, align 4
+  br label %for.cond
+
+for.end:                                          ; preds = %for.cond
+  %4 = load i32, i32* getelementptr inbounds ([3 x i32], [3 x i32]* @a, i64 0, i64 2), align 4
+  %cmp1 = icmp ne i32 %4, 0
+  br i1 %cmp1, label %if.then, label %if.end
+
+if.then:                                          ; preds = %for.end
+  call void @abort() #3
+  unreachable
+
+if.end:                                           ; preds = %for.end
+  ret i32 0
+}
+
+; Function Attrs: nounwind argmemonly
+declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind argmemonly
+
+; Function Attrs: noreturn nounwind
+declare void @abort() noreturn nounwind