xref: /aosp_15_r20/external/llvm/test/Analysis/ScalarEvolution/2008-05-25-NegativeStepToZero.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)
1*9880d681SAndroid Build Coastguard Worker; RUN: opt < %s -analyze -scalar-evolution -scalar-evolution-max-iterations=0 | FileCheck %s
2*9880d681SAndroid Build Coastguard Worker; PR2364
3*9880d681SAndroid Build Coastguard Worker
4*9880d681SAndroid Build Coastguard Worker; CHECK: backedge-taken count is 61
5*9880d681SAndroid Build Coastguard Worker
6*9880d681SAndroid Build Coastguard Workerdefine i32 @func_6() nounwind  {
7*9880d681SAndroid Build Coastguard Workerentry:
8*9880d681SAndroid Build Coastguard Worker	br label %bb5
9*9880d681SAndroid Build Coastguard Worker
10*9880d681SAndroid Build Coastguard Workerbb:		; preds = %bb5
11*9880d681SAndroid Build Coastguard Worker	%tmp2 = add i32 %i.0, 1		; <i32> [#uses=1]
12*9880d681SAndroid Build Coastguard Worker	%tmp4 = add i8 %x.0, -4		; <i8> [#uses=1]
13*9880d681SAndroid Build Coastguard Worker	br label %bb5
14*9880d681SAndroid Build Coastguard Worker
15*9880d681SAndroid Build Coastguard Workerbb5:		; preds = %bb, %entry
16*9880d681SAndroid Build Coastguard Worker	%x.0 = phi i8 [ 0, %entry ], [ %tmp4, %bb ]		; <i8> [#uses=2]
17*9880d681SAndroid Build Coastguard Worker	%i.0 = phi i32 [ 0, %entry ], [ %tmp2, %bb ]		; <i32> [#uses=2]
18*9880d681SAndroid Build Coastguard Worker	%tmp7 = icmp eq i8 %x.0, 12		; <i1> [#uses=1]
19*9880d681SAndroid Build Coastguard Worker	br i1 %tmp7, label %return, label %bb
20*9880d681SAndroid Build Coastguard Worker
21*9880d681SAndroid Build Coastguard Workerreturn:		; preds = %bb5
22*9880d681SAndroid Build Coastguard Worker	ret i32 %i.0
23*9880d681SAndroid Build Coastguard Worker}
24