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 6 define void @foo() #0 { 7 entry: 8 br label %for.body 9 10 for.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 18 for.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 25 define i32 @postinc() #0 { 26 entry: 27 br label %do.body 28 29 do.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 37 do.end: ; preds = %do.body 38 ret i32 0 39 } 40 41 declare void @bar(i32) 42 43 attributes #0 = { nounwind uwtable } 44 attributes #1 = { nounwind } 45
