1 files changed, 51 insertions, 0 deletions
diff --git a/llvm/test/Analysis/MemorySSA/pr28880.ll b/llvm/test/Analysis/MemorySSA/pr28880.ll
new file mode 100644
index 00000000000..ae64c0c5d73
--- /dev/null
+++ b/llvm/test/Analysis/MemorySSA/pr28880.ll
@@ -0,0 +1,51 @@
+; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
+; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
+
+; This testcase is reduced from SingleSource/Benchmarks/Misc/fbench.c
+; It is testing to make sure that the MemorySSA use optimizer
+; comes up with right answers when dealing with multiple MemoryLocations
+; over different blocks. See PR28880 for more details.
+@global = external hidden unnamed_addr global double, align 8
+@global.1 = external hidden unnamed_addr global double, align 8
+
+; Function Attrs: nounwind ssp uwtable
+define hidden fastcc void @hoge() unnamed_addr #0 {
+bb:
+  br i1 undef, label %bb1, label %bb2
+
+bb1:                                              ; preds = %bb
+; These accesses should not conflict.
+; CHECK:  1 = MemoryDef(liveOnEntry)
+; 1 = MemoryDef(liveOnEntry)
+; CHECK-NEXT:   store double undef, double* @global, align 8
+  store double undef, double* @global, align 8
+; CHECK:  MemoryUse(liveOnEntry)
+; MemoryUse(liveOnEntry)
+; CHECK-NEXT:   %tmp = load double, double* @global.1, align 8
+  %tmp = load double, double* @global.1, align 8
+  unreachable
+
+bb2:                                              ; preds = %bb
+  br label %bb3
+
+bb3:                                              ; preds = %bb2
+  br i1 undef, label %bb4, label %bb6
+
+bb4:                                              ; preds = %bb3
+; These accesses should conflict.
+; CHECK:  2 = MemoryDef(liveOnEntry)
+; 2 = MemoryDef(liveOnEntry)
+; CHECK-NEXT:   store double 0.000000e+00, double* @global.1, align 8
+  store double 0.000000e+00, double* @global.1, align 8
+; CHECK:  MemoryUse(2)
+; MemoryUse(2)
+; CHECK-NEXT:   %tmp5 = load double, double* @global.1, align 8
+  %tmp5 = load double, double* @global.1, align 8
+  unreachable
+
+bb6:                                              ; preds = %bb3
+  unreachable
+}
+
+attributes #0 = { nounwind ssp uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="core2" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+ssse3" "unsafe-fp-math"="false" "use-soft-float"="false" }
+