; RUN: opt -passes=dse -S < %s | FileCheck %s declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture, i64, i1) nounwind define void @fn(ptr nocapture %buf) #0 { entry: ; We would not eliminate the first memcpy with data layout, and we should not ; eliminate it without data layout. ; CHECK-LABEL: @fn ; CHECK: tail call void @llvm.memcpy.p0.p0.i64 ; CHECK: tail call void @llvm.memcpy.p0.p0.i64 ; CHECK: ret void %arrayidx = getelementptr i8, ptr %buf, i64 18 tail call void @llvm.memcpy.p0.p0.i64(ptr %arrayidx, ptr %buf, i64 18, i1 false) store i8 1, ptr %arrayidx, align 1 tail call void @llvm.memcpy.p0.p0.i64(ptr %buf, ptr %arrayidx, i64 18, i1 false) ret void }