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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - ScalarEvolution::ComputeExitLimitFromICmp fails computing dhrystone loop iterations"
href="http://llvm.org/bugs/show_bug.cgi?id=16235">16235</a>
</td>
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<tr>
<th>Summary</th>
<td>ScalarEvolution::ComputeExitLimitFromICmp fails computing dhrystone loop iterations
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>marksl@synopsys.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10634" name="attach_10634" title="A simplified test case with the problematic FOR loop">attachment 10634</a> <a href="attachment.cgi?id=10634&action=edit" title="A simplified test case with the problematic FOR loop">[details]</a></span>
A simplified test case with the problematic FOR loop
GCC folds the number of loop iterations to 2. LLVM does not when it appears it
could.
typedef enum {Ident_1, Ident_2, Ident_3, Ident_4, Ident_5} Enumeration;
typedef int One_Fifty;
typedef int Arr_1_Dim [50];
typedef int Arr_2_Dim [50] [50];
extern int Int_Glob;
void
Proc_8 (Arr_1_Par_Ref, Arr_2_Par_Ref, Int_1_Par_Val, Int_2_Par_Val)
Arr_1_Dim Arr_1_Par_Ref;
Arr_2_Dim Arr_2_Par_Ref;
int Int_1_Par_Val;
int Int_2_Par_Val;
{
One_Fifty Int_Index;
One_Fifty Int_Loc;
Int_Loc = Int_1_Par_Val + 5;
Arr_1_Par_Ref [Int_Loc] = Int_2_Par_Val;
Arr_1_Par_Ref [Int_Loc+1] = Arr_1_Par_Ref [Int_Loc];
Arr_1_Par_Ref [Int_Loc+30] = Int_Loc;
for (Int_Index = Int_Loc; Int_Index <= Int_Loc+1; ++Int_Index)
Arr_2_Par_Ref [Int_Loc] [Int_Index] = Int_Loc;
Arr_2_Par_Ref [Int_Loc] [Int_Loc-1] += 1;
Arr_2_Par_Ref [Int_Loc+20] [Int_Loc] = Arr_1_Par_Ref [Int_Loc];
Int_Glob = 5;
}</pre>
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