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; These tests have an infinite trip count. We obviously shouldn't remove the
; loops! :)
;
; RUN: llvm-as < %s | opt -indvars -adce -simplifycfg | llvm-dis | grep icmp | wc -l > %t2
; RUN: llvm-as < %s | llvm-dis | grep icmp | wc -l > %t1
; RUN: diff %t1 %t2
;; test for (i = 1; i != 100; i += 2)
define i32 @infinite_linear() {
entry:
br label %loop
loop: ; preds = %loop, %entry
%i = phi i32 [ 1, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3]
%i.next = add i32 %i, 2 ; <i32> [#uses=1]
%c = icmp ne i32 %i, 100 ; <i1> [#uses=1]
br i1 %c, label %loop, label %loopexit
loopexit: ; preds = %loop
ret i32 %i
}
;; test for (i = 1; i*i != 63; ++i)
define i32 @infinite_quadratic() {
entry:
br label %loop
loop: ; preds = %loop, %entry
%i = phi i32 [ 1, %entry ], [ %i.next, %loop ] ; <i32> [#uses=4]
%isquare = mul i32 %i, %i ; <i32> [#uses=1]
%i.next = add i32 %i, 1 ; <i32> [#uses=1]
%c = icmp ne i32 %isquare, 63 ; <i1> [#uses=1]
br i1 %c, label %loop, label %loopexit
loopexit: ; preds = %loop
ret i32 %i
}
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