Revert "Temporarily Revert "Add basic loop fusion pass.""
The reversion apparently deleted the test/Transforms directory.
Will be re-reverting again.
llvm-svn: 358552
diff --git a/llvm/test/Transforms/MemCpyOpt/align.ll b/llvm/test/Transforms/MemCpyOpt/align.ll
new file mode 100644
index 0000000..738928b
--- /dev/null
+++ b/llvm/test/Transforms/MemCpyOpt/align.ll
@@ -0,0 +1,37 @@
+; RUN: opt < %s -S -basicaa -memcpyopt | FileCheck %s
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64"
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
+declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) nounwind
+
+; The resulting memset is only 4-byte aligned, despite containing
+; a 16-byte aligned store in the middle.
+
+define void @foo(i32* %p) {
+; CHECK-LABEL: @foo(
+; CHECK: call void @llvm.memset.p0i8.i64(i8* align 4 {{.*}}, i8 0, i64 16, i1 false)
+ %a0 = getelementptr i32, i32* %p, i64 0
+ store i32 0, i32* %a0, align 4
+ %a1 = getelementptr i32, i32* %p, i64 1
+ store i32 0, i32* %a1, align 16
+ %a2 = getelementptr i32, i32* %p, i64 2
+ store i32 0, i32* %a2, align 4
+ %a3 = getelementptr i32, i32* %p, i64 3
+ store i32 0, i32* %a3, align 4
+ ret void
+}
+
+; Replacing %a8 with %a4 in the memset requires boosting the alignment of %a4.
+
+define void @bar() {
+; CHECK-LABEL: @bar(
+; CHECK: %a4 = alloca i32, align 8
+; CHECK-NOT: memcpy
+ %a4 = alloca i32, align 4
+ %a8 = alloca i32, align 8
+ %a8.cast = bitcast i32* %a8 to i8*
+ %a4.cast = bitcast i32* %a4 to i8*
+ call void @llvm.memset.p0i8.i64(i8* align 8 %a8.cast, i8 0, i64 4, i1 false)
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %a4.cast, i8* align 4 %a8.cast, i64 4, i1 false)
+ ret void
+}