1;RUN: opt -S %s -indvars | FileCheck %s 2 3; CHECK-LABEL-LABEL: @foo( 4; CHECK-NOT: %lftr.wideiv = trunc i32 %indvars.iv.next to i16 5; CHECK: %exitcond = icmp ne i32 %indvars.iv.next, 512 6define void @foo() #0 { 7entry: 8 br label %for.body 9 10for.body: ; preds = %entry, %for.body 11 %i.01 = phi i16 [ 0, %entry ], [ %inc, %for.body ] 12 %conv2 = sext i16 %i.01 to i32 13 call void @bar(i32 %conv2) #1 14 %inc = add i16 %i.01, 1 15 %cmp = icmp slt i16 %inc, 512 16 br i1 %cmp, label %for.body, label %for.end 17 18for.end: ; preds = %for.body 19 ret void 20} 21 22; Check that post-incrementing the backedge taken count does not overflow. 23; CHECK-LABEL-LABEL: @postinc( 24; CHECK: icmp eq i32 %indvars.iv.next, 256 25define i32 @postinc() #0 { 26entry: 27 br label %do.body 28 29do.body: ; preds = %do.body, %entry 30 %first.0 = phi i8 [ 0, %entry ], [ %inc, %do.body ] 31 %conv = zext i8 %first.0 to i32 32 call void @bar(i32 %conv) #1 33 %inc = add i8 %first.0, 1 34 %cmp = icmp eq i8 %first.0, -1 35 br i1 %cmp, label %do.end, label %do.body 36 37do.end: ; preds = %do.body 38 ret i32 0 39} 40 41declare void @bar(i32) 42 43attributes #0 = { nounwind uwtable } 44attributes #1 = { nounwind } 45