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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -S < %s -passes=loop-idiom | FileCheck %s3; CHECK-NOT: memset4; check that memset is not generated (for stores) because that will result5; in udiv hoisted out of the loop by the SCEV Expander6; TODO: ideally we should be able to generate memset7; if SCEV expander is taught to generate the dependencies8; at the right point.9 10@a = global i32 0, align 411@b = global i32 0, align 412@c = external local_unnamed_addr global [1 x i8], align 113 14define void @e() local_unnamed_addr {15; CHECK-LABEL: @e(16; CHECK-NEXT: entry:17; CHECK-NEXT: [[D0:%.*]] = load i32, ptr @a, align 418; CHECK-NEXT: [[D1:%.*]] = load i32, ptr @b, align 419; 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 i6428; 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 131; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], 132; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i3233; CHECK-NEXT: [[TOBOOL4:%.*]] = icmp eq i32 [[TMP1]], 034; CHECK-NEXT: br i1 [[TOBOOL4]], label [[FOR_COND1THREAD_PRE_SPLIT_LOOPEXIT:%.*]], label [[FOR_BODY5]]35;36entry:37 %d0 = load i32, ptr @a, align 438 %d1 = load i32, ptr @b, align 439 br label %for.cond1thread-pre-split40 41for.cond1thread-pre-split: ; preds = %for.body5, %entry42 %div = udiv i32 %d0, %d143 br label %for.body544 45for.body5: ; preds = %for.body5, %for.cond1thread-pre-split46 %indvars.iv = phi i64 [ 0, %for.cond1thread-pre-split ], [ %indvars.iv.next, %for.body5 ]47 %divx = sext i32 %div to i6448 %0 = add nsw i64 %divx, %indvars.iv49 %arrayidx = getelementptr inbounds [1 x i8], ptr @c, i64 0, i64 %050 store i8 0, ptr %arrayidx, align 151 %indvars.iv.next = add nsw i64 %indvars.iv, 152 %1 = trunc i64 %indvars.iv.next to i3253 %tobool4 = icmp eq i32 %1, 054 br i1 %tobool4, label %for.cond1thread-pre-split, label %for.body555}56 57; The loop's trip count is depending on an unsafe operation58; udiv. SCEV expander hoists it out of the loop, so loop-idiom59; 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 i6469; 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 174; CHECK-NEXT: [[INC]] = add nuw nsw i64 [[I_09]], 175; 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.body80 81for.body: ; preds = %for.body6, %entry82 %div = udiv i32 %a, %b83 %conv = zext i32 %div to i6484 br label %for.body685 86for.body6: ; preds = %for.body6, %for.body87 %i.09 = phi i64 [ %inc, %for.body6 ], [ 0, %for.body ]88 %arrayidx = getelementptr inbounds i8, ptr %x, i64 %i.0989 store i8 0, ptr %arrayidx, align 190 %inc = add nuw nsw i64 %i.09, 191 %cmp3 = icmp slt i64 %inc, %conv92 br i1 %cmp3, label %for.body6, label %for.body93}94 95