1 files changed, 47 insertions, 0 deletions
diff --git a/llvm/test/Transforms/MemCpyOpt/invariant.start.ll b/llvm/test/Transforms/MemCpyOpt/invariant.start.ll
new file mode 100644
index 00000000000..4842114b584
--- /dev/null
+++ b/llvm/test/Transforms/MemCpyOpt/invariant.start.ll
@@ -0,0 +1,47 @@
+; MemCpy optimizations should take place even in presence of invariant.start
+; RUN: opt < %s -basicaa -memcpyopt -dse -S | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+
+target triple = "i686-apple-darwin9"
+
+%0 = type { x86_fp80, x86_fp80 }
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1)
+declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1)
+
+declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) nounwind readonly
+
+; FIXME: The invariant.start does not modify %P.
+; The intermediate alloca and one of the memcpy's should be eliminated, the
+; other should be transformed to a memmove.
+define void @test1(i8* %P, i8* %Q) nounwind  {
+  %memtmp = alloca %0, align 16
+  %R = bitcast %0* %memtmp to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 %R, i8* align 16 %P, i32 32, i1 false)
+  %i = call {}* @llvm.invariant.start.p0i8(i64 32, i8* %P)
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 %Q, i8* align 16 %R, i32 32, i1 false)
+  ret void
+; CHECK-LABEL: @test1(
+; CHECK-NEXT: %memtmp = alloca %0, align 16
+; CHECK-NEXT: %R = bitcast %0* %memtmp to i8*
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 %R, i8* align 16 %P, i32 32, i1 false)
+; CHECK-NEXT: %i = call {}* @llvm.invariant.start.p0i8(i64 32, i8* %P)
+; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 16 %Q, i8* align 16 %R, i32 32, i1 false)
+; CHECK-NEXT: ret void
+}
+
+
+; The invariant.start intrinsic does not inhibit tranforming the memcpy to a
+; memset.
+define void @test2(i8* %dst1, i8* %dst2, i8 %c) {
+; CHECK-LABEL: define void @test2(
+; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* %dst1, i8 %c, i64 128, i1 false)
+; CHECK-NEXT: %i = call {}* @llvm.invariant.start.p0i8(i64 32, i8* %dst1)
+; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 %dst2, i8 %c, i64 128, i1 false)
+; CHECK-NEXT: ret void
+  call void @llvm.memset.p0i8.i64(i8* %dst1, i8 %c, i64 128, i1 false)
+  %i = call {}* @llvm.invariant.start.p0i8(i64 32, i8* %dst1)
+  call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst2, i8* align 8 %dst1, i64 128, i1 false)
+  ret void
+}