1; REQUIRES: asserts 2; RUN: opt -debug-only=loop-unroll-and-jam -passes="loop-unroll-and-jam" -enable-unroll-and-jam -allow-unroll-and-jam -unroll-and-jam-count=8 -disable-output %s 2>&1 | FileCheck %s 3 4; CHECK: Loop Unroll and Jam: F[h] Loop %bb8 5; CHECK: Won't unroll-and-jam; only loops with single exit blocks can be unrolled and jammed 6 7@a = external global i16, align 2 8@e = external global i32, align 4 9@f = external global i16, align 2 10@b = external global i16, align 2 11@c = external global i64, align 8 12 13define void @h() { 14bb: 15 store i32 4, ptr @e, align 4 16 %i15 = load i16, ptr @b, align 2 17 %i17 = icmp slt i16 %i15, 1 18 br label %bb8 19 20bb8: ; preds = %bb, %bb47 21 %storemerge15 = phi i32 [ 4, %bb ], [ %i49, %bb47 ] 22 br label %bb24 23 24bb24: ; preds = %bb43, %bb8 25 %storemerge312 = phi i16 [ 0, %bb8 ], [ %i45, %bb43 ] 26 br i1 %i17, label %bb46.preheader, label %bb43 27 28bb46.preheader: ; preds = %bb24 29 store i16 %storemerge312, ptr @f, align 2 30 br label %bb46 31 32bb43: ; preds = %bb24 33 %i45 = add nuw nsw i16 %storemerge312, 1 34 %i13 = icmp ult i16 %storemerge312, 7 35 br i1 %i13, label %bb24, label %bb47 36 37bb46: ; preds = %bb46.preheader, %bb46 38 br label %bb46 39 40bb47: ; preds = %bb43 41 %i49 = add nsw i32 %storemerge15, -1 42 store i32 %i49, ptr @e, align 4 43 %i7.not = icmp eq i32 %i49, 0 44 br i1 %i7.not, label %bb50, label %bb8 45 46bb50: ; preds = %bb47 47 store i16 %i45, ptr @f, align 2 48 ret void 49} 50