Instead of look at source code and guessing at the definition of
OPR_BLEND, is there some document where we can describe the definition
of new WHIRL opcodes?
Fred
On 06/14/2011 02:51 PM, Sun Chan wrote:
> This is a WHIRL change, Fred, can you look at the change (at least the
> new OPR_BLEND) to see if that is ok?
> Sun
>
> On Tue, Jun 14, 2011 at 1:39 PM, Mathew, Pallavi<pallavi.mat...@amd.com>
> wrote:
>> Hi,
>>
>> Can a gatekeeper please review the attached patch which introduces a
>> framework for vectorization of IF-statements of the form:
>>
>> - if (x != 0) { single_istore_statement } else {empty_body}
>>
>> - if (x != 0) { if (y !=0) {single_istore_statement} else {empty_body}}
>> else {empty_body}
>>
>>
>>
>> Sample program:
>>
>> long array[2000000];
>>
>> void sample() {
>>
>> long i;
>>
>> for(i = 0; i< 2000000; i++) {
>>
>> if (array[i])
>>
>> array[i] ^= i;
>>
>> }
>>
>> return;
>>
>> }
>>
>>
>>
>> Vectorization of such if-statement is done by first vectorizing its
>> subexpressions.
>>
>> The result of the vectorized if-condition is computed by 'pcmpeqq' (V16I8EQ)
>> and
>>
>> is used to select between the result of executing the statement in the
>> if-body or
>>
>> leaving the array element unchanged. This selection is performed by the
>>
>> 'pblendvb' (V16I1V16I1BLEND) operation. Both of these are SSE4.1
>> instructions.
>>
>> We introduce a new whirl operation OPR_BLEND which eventually gets
>> translated to 'pblendvb'.
>>
>> This optimization is turned on by default and can be controlled by
>> -LNO:simd_vect_if={on/off}.
>>
>> This patch also recognizes and handles vectorization of invariants rooted at
>> OPR_ADD, OPR_SUB and OPR_MPY.
>>
>>
>>
>> Files updated by this patch:
>>
>> osprey/be/lno/simd.cxx
>>
>> - vectorization of if-statements.
>>
>> - vectorization of invariants rooted at OPR_ADD, OPR_SUB and OPR_MPY.
>>
>> osprey/common/com/config_lno.h
>>
>> osprey/common/com/config_lno.cxx
>>
>> - add flag to control vectorization of if-statements
>>
>> osprey/common/com/opcode_gen_core.h
>>
>> - add the OPR_BLEND operation and its opcode.
>>
>> - add opcode for vectorized version of OPR_EQ.
>>
>> osprey/common/com/opcode_gen_core.cxx
>>
>> - specify number of kids, desc, rtype, property(expression), etc. for
>> OPR_BLEND.
>>
>> osprey/common/com/wn.cxx
>>
>> - enable WN_has_side_effects for opr_blend
>>
>> osprey/be/opt/opt_bdce.cxx
>>
>> - propagate live bits down the expression tree.
>>
>> osprey/be/cg/whirl2ops.cxx
>>
>> - expand expression containing OPR_BLEND
>>
>> - add handler for blend.
>>
>> osprey/be/cg/cgexp_internals.h
>>
>> - add declaration of Expand_Blend
>>
>> osprey/be/cg/x8664/expand.cxx
>>
>> - expand OPC_BLEND to expression containing TNs
>>
>> osprey/be/com/x8664/betarget.cxx
>>
>> - convert opcode to TOP... (return top_blend...)
>>
>> osprey/common/com/wn_util.h
>>
>> osprey/common/com/wn_util.cxx
>>
>> - add utility routine.
>>
>>
>>
>> Thanks.
>>
>> Pallavi
>>
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>>
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