1;RUN: opt -S %s -indvars | FileCheck %s 2 3; Provide legal integer types. 4target datalayout = "n8:16:32:64" 5 6 7; CHECK-LABEL: @foo( 8; CHECK-NOT: %lftr.wideiv = trunc i32 %indvars.iv.next to i16 9; CHECK: %exitcond = icmp ne i32 %indvars.iv.next, 512 10define void @foo() #0 { 11entry: 12 br label %for.body 13 14for.body: ; preds = %entry, %for.body 15 %i.01 = phi i16 [ 0, %entry ], [ %inc, %for.body ] 16 %conv2 = sext i16 %i.01 to i32 17 call void @bar(i32 %conv2) #1 18 %inc = add i16 %i.01, 1 19 %cmp = icmp slt i16 %inc, 512 20 br i1 %cmp, label %for.body, label %for.end 21 22for.end: ; preds = %for.body 23 ret void 24} 25 26; Check that post-incrementing the backedge taken count does not overflow. 27; CHECK-LABEL: @postinc( 28; CHECK: icmp eq i32 %indvars.iv, 255 29define i32 @postinc() #0 { 30entry: 31 br label %do.body 32 33do.body: ; preds = %do.body, %entry 34 %first.0 = phi i8 [ 0, %entry ], [ %inc, %do.body ] 35 %conv = zext i8 %first.0 to i32 36 call void @bar(i32 %conv) #1 37 %inc = add i8 %first.0, 1 38 %cmp = icmp eq i8 %first.0, -1 39 br i1 %cmp, label %do.end, label %do.body 40 41do.end: ; preds = %do.body 42 ret i32 0 43} 44 45declare void @bar(i32) 46 47attributes #0 = { nounwind uwtable } 48attributes #1 = { nounwind } 49