[LLVMdev] [POLLY] fix Bug 15817

[Tobias Grosser]

On 05/31/2013 10:11 AM, Sebastian Pop wrote:
> Sebastian Pop wrote:
>> Sebastian Pop wrote:
>>> Jack Howarth wrote:
>>>>     The attached patch eliminates http://llvm.org/bugs/show_bug.cgi?id=15817 by removing the remaining
>>>> "; XFAIL:*" added in http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130415/171812.html.
>>>> The Isl/CodeGen/scevcodegen-1.ll testcase in polly appears as an XPASS in current llvm/polly 3.3
>>>> and trunk svn for both x86_64-apple-darwin* and x86_64 Fedora 15 when built against isl 0.11.1/2 and
>>>> cloog 0.18.0. The attached patch eliminates this unexpected XPASS seen with newer isl/cloog.
>>>>               Jack
>>>
>>>> Index: test/Isl/CodeGen/scevcodegen-1.ll
>>>> ===================================================================
>>>> --- test/Isl/CodeGen/scevcodegen-1.ll	(revision 182998)
>>>> +++ test/Isl/CodeGen/scevcodegen-1.ll	(working copy)
>>>> @@ -1,7 +1,6 @@
>>>>   ; RUN: opt %loadPolly -polly-codegen-isl -polly-codegen-scev %s
>>>>   ; -polly-independent causes: Cannot generate independent blocks
>>>>   ;
>>>> -; XFAIL:*
>>>>   target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
>>>>   target triple = "x86_64-unknown-linux-gnu"
>>>>
>>>
>>> If I remove that XFAIL the testcase is ICEing on my ARM laptop with:
>>>
>>> opt: ../tools/polly/lib/Analysis/ScopDetection.cpp:353: bool polly::ScopDetection::isValidInstruction(llvm::Instruction&, polly::ScopDetection::DetectionContext&) const: Assertion `!Context.Verifying && "IndVar"' failed.
>>>
>>
>> This was with ISL as of this commit:
>>
>> commit 02b2b6f2298d6beca919692219a287986e984347
>> Author: Sven Verdoolaege <skimo at kotnet.org>
>> Date:   Tue Apr 9 17:37:46 2013 +0200
>>
>>
>> When updating ISL to master as of today, I get a compile error when building polly:
>>
>> commit 1df91d8515ec88dc7f7f597168ad0f34f26de5a7
>> Author: Sven Verdoolaege <skimo at kotnet.org>
>> Date:   Wed Apr 17 12:38:51 2013 +0200
>>
>>      isl_ast_codegen.c: contruct_shifted_executed: use isl_val
>>
>>      Signed-off-by: Sven Verdoolaege <skimo at kotnet.org>
>>
>>
>> In file included from ../tools/polly/lib/DeadCodeElimination.cpp:23:0:
>> /home/spop/s/isl/usr/include/isl/union_map.h:114:23: error: isl_multi_aff has not been declared

Hi Sebastian,

the test case is expected to fail. It shows an open bug with 
-enable-codegen-scev and the independent blocks pass. The problem was 
that it was not consistently failing. I fixed this in r183025.

Cheers,
Tobias