http://llvm.org/bugs/show_bug.cgi?id=16235
Bug ID: 16235
Summary: ScalarEvolution::ComputeExitLimitFromICmp fails
computing dhrystone loop iterations
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 10634
--> http://llvm.org/bugs/attachment.cgi?id=10634&action=edit
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;
}
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