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; RUN: opt -indvars -S < %s | FileCheck %s
declare void @use(i32)
declare void @use.i8(i8)
define void @f() {
; CHECK-LABEL: @f
entry:
br label %loop
loop:
; The only use for idx.mirror is to induce an nuw for %idx. It does
; not induce an nuw for %idx.inc
%idx.mirror = phi i8 [ -6, %entry ], [ %idx.mirror.inc, %loop ]
%idx = phi i8 [ -5, %entry ], [ %idx.inc, %loop ]
%idx.sext = sext i8 %idx to i32
call void @use(i32 %idx.sext)
%idx.mirror.inc = add nuw i8 %idx.mirror, 1
call void @use.i8(i8 %idx.mirror.inc)
%idx.inc = add i8 %idx, 1
; CHECK-NOT: %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
%cmp = icmp ugt i8 %idx.inc, 0
br i1 %cmp, label %loop, label %exit
exit:
ret void
}
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