; Test that the memmove library call simplifier works correctly. ; ; RUN: opt < %s -passes=instcombine -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" declare ptr @memmove(ptr, ptr, i32) ; Check memmove(mem1, mem2, size) -> llvm.memmove(mem1, mem2, size, 1). define ptr @test_simplify1(ptr %mem1, ptr %mem2, i32 %size) { ; CHECK-LABEL: @test_simplify1( %ret = call ptr @memmove(ptr %mem1, ptr %mem2, i32 %size) ; CHECK: call void @llvm.memmove ret ptr %ret ; CHECK: ret ptr %mem1 } define ptr @test_simplify2(ptr %mem1, ptr %mem2, i32 %size) { ; CHECK-LABEL: @test_simplify2( ; CHECK-NEXT: tail call void @llvm.memmove ; CHECK-NEXT: ret ptr %mem1 %ret = tail call ptr @memmove(ptr %mem1, ptr %mem2, i32 %size) ret ptr %ret } define ptr @test_no_simplify1(ptr %mem1, ptr %mem2, i32 %size) { ; CHECK-LABEL: @test_no_simplify1( ; CHECK-NEXT: %ret = musttail call ptr @memmove(ptr %mem1, ptr %mem2, i32 %size) ; CHECK-NEXT: ret ptr %ret %ret = musttail call ptr @memmove(ptr %mem1, ptr %mem2, i32 %size) ret ptr %ret } define ptr @test_no_incompatible_attr(ptr %mem1, ptr %mem2, i32 %size) { ; CHECK-LABEL: @test_no_incompatible_attr( %ret = call dereferenceable(1) ptr @memmove(ptr %mem1, ptr %mem2, i32 %size) ; CHECK: call void @llvm.memmove ret ptr %ret ; CHECK: ret ptr %mem1 }