1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -S < %s -passes=loop-idiom | FileCheck %s 3; CHECK-NOT: memset 4; check that memset is not generated (for stores) because that will result 5; in udiv hoisted out of the loop by the SCEV Expander 6; TODO: ideally we should be able to generate memset 7; if SCEV expander is taught to generate the dependencies 8; at the right point. 9 10@a = global i32 0, align 4 11@b = global i32 0, align 4 12@c = external local_unnamed_addr global [1 x i8], align 1 13 14define void @e() local_unnamed_addr { 15; CHECK-LABEL: @e( 16; CHECK-NEXT: entry: 17; CHECK-NEXT: [[D0:%.*]] = load i32, ptr @a, align 4 18; CHECK-NEXT: [[D1:%.*]] = load i32, ptr @b, align 4 19; CHECK-NEXT: br label [[FOR_COND1THREAD_PRE_SPLIT:%.*]] 20; CHECK: for.cond1thread-pre-split.loopexit: 21; CHECK-NEXT: br label [[FOR_COND1THREAD_PRE_SPLIT]] 22; CHECK: for.cond1thread-pre-split: 23; CHECK-NEXT: [[DIV:%.*]] = udiv i32 [[D0]], [[D1]] 24; CHECK-NEXT: br label [[FOR_BODY5:%.*]] 25; CHECK: for.body5: 26; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[FOR_COND1THREAD_PRE_SPLIT]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY5]] ] 27; CHECK-NEXT: [[DIVX:%.*]] = sext i32 [[DIV]] to i64 28; CHECK-NEXT: [[TMP0:%.*]] = add nsw i64 [[DIVX]], [[INDVARS_IV]] 29; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1 x i8], ptr @c, i64 0, i64 [[TMP0]] 30; CHECK-NEXT: store i8 0, ptr [[ARRAYIDX]], align 1 31; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], 1 32; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32 33; CHECK-NEXT: [[TOBOOL4:%.*]] = icmp eq i32 [[TMP1]], 0 34; CHECK-NEXT: br i1 [[TOBOOL4]], label [[FOR_COND1THREAD_PRE_SPLIT_LOOPEXIT:%.*]], label [[FOR_BODY5]] 35; 36entry: 37 %d0 = load i32, ptr @a, align 4 38 %d1 = load i32, ptr @b, align 4 39 br label %for.cond1thread-pre-split 40 41for.cond1thread-pre-split: ; preds = %for.body5, %entry 42 %div = udiv i32 %d0, %d1 43 br label %for.body5 44 45for.body5: ; preds = %for.body5, %for.cond1thread-pre-split 46 %indvars.iv = phi i64 [ 0, %for.cond1thread-pre-split ], [ %indvars.iv.next, %for.body5 ] 47 %divx = sext i32 %div to i64 48 %0 = add nsw i64 %divx, %indvars.iv 49 %arrayidx = getelementptr inbounds [1 x i8], ptr @c, i64 0, i64 %0 50 store i8 0, ptr %arrayidx, align 1 51 %indvars.iv.next = add nsw i64 %indvars.iv, 1 52 %1 = trunc i64 %indvars.iv.next to i32 53 %tobool4 = icmp eq i32 %1, 0 54 br i1 %tobool4, label %for.cond1thread-pre-split, label %for.body5 55} 56 57; The loop's trip count is depending on an unsafe operation 58; udiv. SCEV expander hoists it out of the loop, so loop-idiom 59; should check that the memset is not generated in this case. 60define void @f(i32 %a, i32 %b, ptr nocapture %x) local_unnamed_addr { 61; CHECK-LABEL: @f( 62; CHECK-NEXT: entry: 63; CHECK-NEXT: br label [[FOR_BODY:%.*]] 64; CHECK: for.body.loopexit: 65; CHECK-NEXT: br label [[FOR_BODY]] 66; CHECK: for.body: 67; CHECK-NEXT: [[DIV:%.*]] = udiv i32 [[A:%.*]], [[B:%.*]] 68; CHECK-NEXT: [[CONV:%.*]] = zext i32 [[DIV]] to i64 69; CHECK-NEXT: br label [[FOR_BODY6:%.*]] 70; CHECK: for.body6: 71; CHECK-NEXT: [[I_09:%.*]] = phi i64 [ [[INC:%.*]], [[FOR_BODY6]] ], [ 0, [[FOR_BODY]] ] 72; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i8, ptr [[X:%.*]], i64 [[I_09]] 73; CHECK-NEXT: store i8 0, ptr [[ARRAYIDX]], align 1 74; CHECK-NEXT: [[INC]] = add nuw nsw i64 [[I_09]], 1 75; CHECK-NEXT: [[CMP3:%.*]] = icmp slt i64 [[INC]], [[CONV]] 76; CHECK-NEXT: br i1 [[CMP3]], label [[FOR_BODY6]], label [[FOR_BODY_LOOPEXIT:%.*]] 77; 78entry: 79 br label %for.body 80 81for.body: ; preds = %for.body6, %entry 82 %div = udiv i32 %a, %b 83 %conv = zext i32 %div to i64 84 br label %for.body6 85 86for.body6: ; preds = %for.body6, %for.body 87 %i.09 = phi i64 [ %inc, %for.body6 ], [ 0, %for.body ] 88 %arrayidx = getelementptr inbounds i8, ptr %x, i64 %i.09 89 store i8 0, ptr %arrayidx, align 1 90 %inc = add nuw nsw i64 %i.09, 1 91 %cmp3 = icmp slt i64 %inc, %conv 92 br i1 %cmp3, label %for.body6, label %for.body 93} 94 95