http://llvm.org/bugs/show_bug.cgi?id=19336
Bug ID: 19336
Summary: Delinearization fails when loop indexes are in reverse
order
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 12342
--> http://llvm.org/bugs/attachment.cgi?id=12342&action=edit
Reduced test case
We can sucessfully delinearize this piece of code:
A[][dim_size];
for (i = 0; i < n; i++)_
for (j = 0; j < n; j++)
A[i][j]
AddRec: {{%A,+,(4 * %dim_size)}<%loop.i>,+,4}<%loop.j>
Base offset: %A
ArrayDecl[UnknownSize][%dim_size] with elements of 4 bytes.
ArrayRef[{0,+,1}<%loop.i>][{0,+,1}<%loop.j>]
but fail for:
A[][dim_size];
for (i = 0; i < n; i++)_
for (j = 0; j < n; j++)
A[j][i]
AddRec: {{%A,+,4}<%loop.i>,+,(4 * %dim_size)}<%loop.j>
Base offset: %A
ArrayDecl[UnknownSize][1] with elements of 4 bytes.
ArrayRef[{0,+,1}<%loop.i>][{0,+,%dim_size}<%loop.j>]
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