Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Transforms/GVN/non-local-offset.ll

@@ -0,0 +1,59 @@
+; RUN: opt -basicaa -gvn -S < %s | FileCheck %s
+
+target datalayout = "e-p:64:64:64"
+
+; GVN should ignore the store to p[1] to see that the load from p[0] is
+; fully redundant.
+
+; CHECK-LABEL: @yes(
+; CHECK: if.then:
+; CHECK-NEXT: store i32 0, i32* %q
+; CHECK-NEXT: ret void
+
+define void @yes(i1 %c, i32* %p, i32* %q) nounwind {
+entry:
+  store i32 0, i32* %p
+  %p1 = getelementptr inbounds i32, i32* %p, i64 1
+  store i32 1, i32* %p1
+  br i1 %c, label %if.else, label %if.then
+
+if.then:
+  %t = load i32, i32* %p
+  store i32 %t, i32* %q
+  ret void
+
+if.else:
+  ret void
+}
+
+; GVN should ignore the store to p[1] to see that the first load from p[0] is
+; fully redundant. However, the second load is larger, so it's not a simple
+; redundancy.
+
+; CHECK-LABEL: @watch_out_for_size_change(
+; CHECK: if.then:
+; CHECK-NEXT: store i32 0, i32* %q
+; CHECK-NEXT: ret void
+; CHECK: if.else:
+; CHECK: load i64, i64* %pc
+; CHECK: store i64
+
+define void @watch_out_for_size_change(i1 %c, i32* %p, i32* %q) nounwind {
+entry:
+  store i32 0, i32* %p
+  %p1 = getelementptr inbounds i32, i32* %p, i64 1
+  store i32 1, i32* %p1
+  br i1 %c, label %if.else, label %if.then
+
+if.then:
+  %t = load i32, i32* %p
+  store i32 %t, i32* %q
+  ret void
+
+if.else:
+  %pc = bitcast i32* %p to i64*
+  %qc = bitcast i32* %q to i64*
+  %t64 = load i64, i64* %pc
+  store i64 %t64, i64* %qc
+  ret void
+}