Revert r129518, "Change ELF systems to use CFI for producing the EH tables. This...

[oota-llvm.git] / test / Transforms / DeadStoreElimination / memintrinsics.ll

diff --git a/test/Transforms/DeadStoreElimination/memintrinsics.ll b/test/Transforms/DeadStoreElimination/memintrinsics.ll
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..e31e9fa3ca6a154c49011c95fcd0e28c46b50fa2 100644 (file)
--- a/test/Transforms/DeadStoreElimination/memintrinsics.ll
+++ b/test/Transforms/DeadStoreElimination/memintrinsics.ll
@@ -0,0 +1,47 @@
+; RUN: opt -S -dse < %s | FileCheck %s
+
+declare void @llvm.memcpy.i8(i8*, i8*, i8, i32)
+declare void @llvm.memmove.i8(i8*, i8*, i8, i32)
+declare void @llvm.memset.i8(i8*, i8, i8, i32)
+
+define void @test1() {
+; CHECK: @test1
+  %A = alloca i8
+  %B = alloca i8
+
+  store i8 0, i8* %A  ;; Written to by memcpy
+; CHECK-NOT: store
+
+  call void @llvm.memcpy.i8(i8* %A, i8* %B, i8 -1, i32 0)
+
+  ret void
+; CHECK: ret void
+}
+
+define void @test2() {
+; CHECK: @test2
+  %A = alloca i8
+  %B = alloca i8
+
+  store i8 0, i8* %A  ;; Written to by memmove
+; CHECK-NOT: store
+
+  call void @llvm.memmove.i8(i8* %A, i8* %B, i8 -1, i32 0)
+
+  ret void
+; CHECK: ret void
+}
+
+define void @test3() {
+; CHECK: @test3
+  %A = alloca i8
+  %B = alloca i8
+
+  store i8 0, i8* %A  ;; Written to by memset
+; CHECK-NOT: store
+
+  call void @llvm.memset.i8(i8* %A, i8 0, i8 -1, i32 0)
+
+  ret void
+; CHECK: ret void
+}