1 ; RUN: opt -loop-load-elim -S < %s | FileCheck %s 2 3 ; Simple st->ld forwarding derived from a lexical forwrad dep. 4 ; 5 ; for (unsigned i = 0; i < 100; i++) { 6 ; A[i+1] = B[i] + 2; 7 ; C[i] = A[i] * 2; 8 ; } 9 10 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 11 12 define void @f(i32* %A, i32* %B, i32* %C, i64 %N) { 13 14 ; CHECK: for.body.lver.check: 15 ; CHECK: %found.conflict{{.*}} = 16 ; CHECK-NOT: %found.conflict{{.*}} = 17 18 entry: 19 ; for.body.ph: 20 ; CHECK: %load_initial = load i32, i32* %A 21 br label %for.body 22 23 for.body: ; preds = %for.body, %entry 24 ; CHECK: %store_forwarded = phi i32 [ %load_initial, %for.body.ph ], [ %a_p1, %for.body ] 25 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 26 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 27 28 %Aidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next 29 %Bidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv 30 %Cidx = getelementptr inbounds i32, i32* %C, i64 %indvars.iv 31 %Aidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv 32 33 %b = load i32, i32* %Bidx, align 4 34 %a_p1 = add i32 %b, 2 35 store i32 %a_p1, i32* %Aidx_next, align 4 36 37 %a = load i32, i32* %Aidx, align 4 38 ; CHECK: %c = mul i32 %store_forwarded, 2 39 %c = mul i32 %a, 2 40 store i32 %c, i32* %Cidx, align 4 41 42 %exitcond = icmp eq i64 %indvars.iv.next, %N 43 br i1 %exitcond, label %for.end, label %for.body 44 45 for.end: ; preds = %for.body 46 ret void 47 } 48
