1 ; RUN: opt -loop-load-elim -S < %s | FileCheck %s 2 ; RUN: opt -loop-load-elim -S -runtime-check-per-loop-load-elim=2 < %s | FileCheck %s --check-prefix=AGGRESSIVE 3 4 ; This needs two pairs of memchecks (A * { C, D }) for a single load 5 ; elimination which is considered to expansive by default. 6 ; 7 ; for (unsigned i = 0; i < 100; i++) { 8 ; A[i+1] = B[i] + 2; 9 ; C[i] = A[i] * 2; 10 ; D[i] = 2; 11 ; } 12 13 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 14 15 define void @f(i32* %A, i32* %B, i32* %C, i64 %N, i32* %D) { 16 entry: 17 br label %for.body 18 19 ; AGGRESSIVE: for.body.lver.check: 20 ; AGGRESSIVE: %found.conflict{{.*}} = 21 ; AGGRESSIVE: %found.conflict{{.*}} = 22 ; AGGRESSIVE-NOT: %found.conflict{{.*}} = 23 24 for.body: ; preds = %for.body, %entry 25 ; CHECK-NOT: %store_forwarded = 26 ; AGGRESSIVE: %store_forwarded = 27 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 28 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 29 30 %Aidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next 31 %Bidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv 32 %Cidx = getelementptr inbounds i32, i32* %C, i64 %indvars.iv 33 %Aidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv 34 %Didx = getelementptr inbounds i32, i32* %D, i64 %indvars.iv 35 36 %b = load i32, i32* %Bidx, align 4 37 %a_p1 = add i32 %b, 2 38 store i32 %a_p1, i32* %Aidx_next, align 4 39 40 %a = load i32, i32* %Aidx, align 4 41 ; CHECK: %c = mul i32 %a, 2 42 ; AGGRESSIVE: %c = mul i32 %store_forwarded, 2 43 %c = mul i32 %a, 2 44 store i32 %c, i32* %Cidx, align 4 45 store i32 2, i32* %Didx, align 4 46 47 %exitcond = icmp eq i64 %indvars.iv.next, %N 48 br i1 %exitcond, label %for.end, label %for.body 49 50 for.end: ; preds = %for.body 51 ret void 52 } 53
