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release_26

## 2008-11-18-Stride1.ll @release_26 — raw · history · blame

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35``` ```; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output \ ; RUN: | grep {Loop bb: Unpredictable backedge-taken count\\.} ; ScalarEvolution can't compute a trip count because it doesn't know if ; dividing by the stride will have a remainder. This could theoretically ; be teaching it how to use a more elaborate trip count computation. define i32 @f(i32 %x) nounwind readnone { entry: %0 = icmp ugt i32 %x, 4 ; [#uses=1] br i1 %0, label %bb.nph, label %bb2 bb.nph: ; preds = %entry br label %bb bb: ; preds = %bb.nph, %bb1 %indvar = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb1 ] ; [#uses=2] %tmp = mul i32 %indvar, -3 ; [#uses=1] %x_addr.04 = add i32 %tmp, %x ; [#uses=1] %1 = add i32 %x_addr.04, -3 ; [#uses=2] br label %bb1 bb1: ; preds = %bb %2 = icmp ugt i32 %1, 4 ; [#uses=1] %indvar.next = add i32 %indvar, 1 ; [#uses=1] br i1 %2, label %bb, label %bb1.bb2_crit_edge bb1.bb2_crit_edge: ; preds = %bb1 %.lcssa = phi i32 [ %1, %bb1 ] ; [#uses=1] br label %bb2 bb2: ; preds = %bb1.bb2_crit_edge, %entry %x_addr.0.lcssa = phi i32 [ %.lcssa, %bb1.bb2_crit_edge ], [ %x, %entry ] ; [#uses=1] ret i32 %x_addr.0.lcssa } ```