; These tests have an infinite trip count. We obviously shouldn't remove the | |
; loops! :) | |
; | |
; RUN: opt < %s -indvars -adce -simplifycfg -S | 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 | |
} | |