1 ; RUN: opt < %s -O1 -S | FileCheck %s 2 3 ; performCallSlotOptzn in MemCpy should not exchange the calls to 4 ; @llvm.lifetime.start and @llvm.memcpy. 5 6 declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #1 7 declare void @llvm.lifetime.start(i64, i8* nocapture) #1 8 declare void @llvm.lifetime.end(i64, i8* nocapture) #1 9 10 define void @_ZN4CordC2EOS_(i8* nocapture dereferenceable(16) %arg1) { 11 bb: 12 ; CHECK-LABEL: @_ZN4CordC2EOS_ 13 ; CHECK-NOT: call void @llvm.lifetime.start 14 ; CHECK: ret void 15 %tmp = alloca [8 x i8], align 8 16 %tmp5 = bitcast [8 x i8]* %tmp to i8* 17 call void @llvm.lifetime.start(i64 16, i8* %tmp5) 18 %tmp10 = getelementptr inbounds i8, i8* %tmp5, i64 7 19 store i8 0, i8* %tmp10, align 1 20 call void @llvm.memcpy.p0i8.p0i8.i64(i8* %arg1, i8* %tmp5, i64 16, i32 8, i1 false) 21 call void @llvm.lifetime.end(i64 16, i8* %tmp5) 22 ret void 23 } 24 25 attributes #1 = { argmemonly nounwind } 26
