; RUN: opt -S -passes='print' -pass-remarks-analysis=loop-vectorize -disable-output < %s 2>&1 | FileCheck %s --check-prefix=ANALYSIS ; Test that LoopVectorize don't report 'Use #pragma loop distribute(enable) to allow loop distribution' ; when we already add #pragma clang loop distribute(enable). ; ; Testcase derived from the following C: ; ; #define M 100 ; void foo (int *restrict y, int *restrict x, int *restrict indices, int n) ; { ; int k = 3; ; #pragma clang loop distribute(enable) ; for (int i = 0; i < n; i++) { ; y[i + k * M] = y[i + k* M] + 1; ; y[i + k * (M+1)] = indices[i] + 2; ; } ; } define void @foo(ptr noalias nocapture noundef %y, ptr noalias nocapture noundef readnone %x, ptr noalias nocapture noundef readonly %indices, i32 noundef %n) { ; ANALYSIS: Report: unsafe dependent memory operations in loop. ; ANALYSIS: Backward loop carried data dependence that prevents store-to-load forwarding. entry: %cmp22 = icmp sgt i32 %n, 0 br i1 %cmp22, label %for.body.preheader, label %for.cond.cleanup for.body.preheader: ; preds = %entry %wide.trip.count = zext i32 %n to i64 br label %for.body for.cond.cleanup.loopexit: ; preds = %for.body br label %for.cond.cleanup for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry ret void for.body: ; preds = %for.body, %for.body.preheader %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ] %0 = add nuw nsw i64 %indvars.iv, 300 %arrayidx = getelementptr inbounds i32, ptr %y, i64 %0 %1 = load i32, ptr %arrayidx, align 4 %add1 = add nsw i32 %1, 1 store i32 %add1, ptr %arrayidx, align 4 %arrayidx7 = getelementptr inbounds i32, ptr %indices, i64 %indvars.iv %2 = load i32, ptr %arrayidx7, align 4 %add8 = add nsw i32 %2, 2 %3 = add nuw nsw i64 %indvars.iv, 303 %arrayidx12 = getelementptr inbounds i32, ptr %y, i64 %3 store i32 %add8, ptr %arrayidx12, align 4 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count br i1 %exitcond.not, label %for.cond.cleanup.loopexit, label %for.body, !llvm.loop !0 } !0 = distinct !{!0, !1} !1 = !{!"llvm.loop.distribute.enable", i1 true}