1 ; RUN: opt -basicaa -memcpyopt -instcombine -S < %s | FileCheck %s 2 3 target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128" 4 target triple = "x86_64-unknown-linux-gnu" 5 6 define void @foo([8 x i64]* noalias nocapture sret dereferenceable(64) %sret) { 7 entry-block: 8 %a = alloca [8 x i64], align 8 9 %a.cast = bitcast [8 x i64]* %a to i8* 10 call void @llvm.lifetime.start(i64 64, i8* %a.cast) 11 call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 0, i64 64, i32 8, i1 false) 12 %sret.cast = bitcast [8 x i64]* %sret to i8* 13 call void @llvm.memcpy.p0i8.p0i8.i64(i8* %sret.cast, i8* %a.cast, i64 64, i32 8, i1 false) 14 call void @llvm.lifetime.end(i64 64, i8* %a.cast) 15 ret void 16 17 ; CHECK-LABEL: @foo( 18 ; CHECK: %[[sret_cast:[^=]+]] = bitcast [8 x i64]* %sret to i8* 19 ; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* %[[sret_cast]], i8 0, i64 64 20 ; CHECK-NOT: call void @llvm.memcpy 21 ; CHECK: ret void 22 } 23 24 define void @bar([8 x i64]* noalias nocapture sret dereferenceable(64) %sret, [8 x i64]* noalias nocapture dereferenceable(64) %out) { 25 entry-block: 26 %a = alloca [8 x i64], align 8 27 %a.cast = bitcast [8 x i64]* %a to i8* 28 call void @llvm.lifetime.start(i64 64, i8* %a.cast) 29 call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 0, i64 64, i32 8, i1 false) 30 %sret.cast = bitcast [8 x i64]* %sret to i8* 31 call void @llvm.memcpy.p0i8.p0i8.i64(i8* %sret.cast, i8* %a.cast, i64 64, i32 8, i1 false) 32 call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 42, i64 32, i32 8, i1 false) 33 %out.cast = bitcast [8 x i64]* %out to i8* 34 call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out.cast, i8* %a.cast, i64 64, i32 8, i1 false) 35 call void @llvm.lifetime.end(i64 64, i8* %a.cast) 36 ret void 37 38 ; CHECK-LABEL: @bar( 39 ; CHECK: %[[a:[^=]+]] = alloca [8 x i64] 40 ; CHECK: %[[a_cast:[^=]+]] = bitcast [8 x i64]* %[[a]] to i8* 41 ; CHECK: call void @llvm.memset.p0i8.i64(i8* %[[a_cast]], i8 0, i64 64 42 ; CHECK: %[[sret_cast:[^=]+]] = bitcast [8 x i64]* %sret to i8* 43 ; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %[[sret_cast]], i8* %[[a_cast]], i64 64 44 ; CHECK: call void @llvm.memset.p0i8.i64(i8* %[[a_cast]], i8 42, i64 32 45 ; CHECK: %[[out_cast:[^=]+]] = bitcast [8 x i64]* %out to i8* 46 ; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %[[out_cast]], i8* %[[a_cast]], i64 64 47 ; CHECK-NOT: call void @llvm.memcpy 48 ; CHECK: ret void 49 } 50 51 declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind 52 declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind 53 54 declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) nounwind 55 declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind 56
