1 ; RUN: opt -loop-load-elim -S < %s | FileCheck %s 2 3 ; No loop-carried forwarding: The intervening store to A[i] kills the stored 4 ; value from the previous iteration. 5 ; 6 ; for (unsigned i = 0; i < 100; i++) { 7 ; A[i] = 1; 8 ; A[i+1] = A[i] + B[i]; 9 ; } 10 11 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 12 13 define void @f(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N) { 14 entry: 15 br label %for.body 16 17 for.body: ; preds = %for.body, %entry 18 ; CHECK-NOT: %store_forwarded 19 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 20 %arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv 21 store i32 1, i32* %arrayidx, align 4 22 %a = load i32, i32* %arrayidx, align 4 23 %arrayidxB = getelementptr inbounds i32, i32* %B, i64 %indvars.iv 24 %b = load i32, i32* %arrayidxB, align 4 25 ; CHECK: %add = add i32 %b, %a 26 %add = add i32 %b, %a 27 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 28 %arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next 29 store i32 %add, i32* %arrayidx_next, align 4 30 %exitcond = icmp eq i64 %indvars.iv.next, %N 31 br i1 %exitcond, label %for.end, label %for.body 32 33 for.end: ; preds = %for.body 34 ret void 35 } 36
