Change memcpy/memset/memmove to have dest and source alignments.

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

diff --git a/test/Transforms/DeadStoreElimination/lifetime.ll b/test/Transforms/DeadStoreElimination/lifetime.ll
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..87c310460db15c10c35b36e08555da85025f35a0 100644 (file)
--- a/test/Transforms/DeadStoreElimination/lifetime.ll
+++ b/test/Transforms/DeadStoreElimination/lifetime.ll
@@ -0,0 +1,37 @@
+; RUN: opt -S -basicaa -dse < %s | FileCheck %s
+
+target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
+
+declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
+declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
+declare void @llvm.memset.p0i8.i8(i8* nocapture, i8, i8, i1) nounwind
+
+define void @test1() {
+; CHECK-LABEL: @test1(
+  %A = alloca i8
+
+  store i8 0, i8* %A  ;; Written to by memset
+  call void @llvm.lifetime.end(i64 1, i8* %A)
+; CHECK: lifetime.end
+
+  call void @llvm.memset.p0i8.i8(i8* %A, i8 0, i8 -1, i1 false)
+; CHECK-NOT: memset
+
+  ret void
+; CHECK: ret void
+}
+
+define void @test2(i32* %P) {
+; CHECK: test2
+  %Q = getelementptr i32, i32* %P, i32 1
+  %R = bitcast i32* %Q to i8*
+  call void @llvm.lifetime.start(i64 4, i8* %R)
+; CHECK: lifetime.start
+  store i32 0, i32* %Q  ;; This store is dead.
+; CHECK-NOT: store
+  call void @llvm.lifetime.end(i64 4, i8* %R)
+; CHECK: lifetime.end
+  ret void
+}
+
+