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Re: Shark suggests SSE on code that uses .... SSE
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Re: Shark suggests SSE on code that uses .... SSE

  • Subject: Re: Shark suggests SSE on code that uses .... SSE
  • From: Benson Margulies <email@hidden>
  • Date: Tue, 14 Apr 2009 17:11:46 -0400
The wording, if you ask, me, could be a hair clearer, but I guess I'm
splitting a hair.

On Tue, Apr 14, 2009 at 4:43 PM, Rick Altherr <email@hidden> wrote:
>
> On Apr 14, 2009, at 1:08 PM, Benson Margulies wrote:
>
>> 5.1%    0x100410dec                                     movq     (%rdx,
>> %rcx, 8), %rdi  !       Loop start[6],
>> SSE     bt_ape_decoder.cpp:167
>> 0.0%    0x100410df0                                     movq     (%rdi),
>> %rax                   bt_ape_decoder.cpp:168
>> 0.0%    0x100410df3                                     movl     %r14d,
>> %r8d                    bt_ape_decoder.cpp:168
>>        0x100410df6                                     movl     %r12d,
>> ìx                    bt_ape_decoder.cpp:168
>> 5.0%    0x100410df9                                     movl     %r13d,
>> íx                    bt_ape_decoder.cpp:168
>>        0x100410dfc                                     movq
>> -168(%rbp), %rsi                       bt_ape_decoder.cpp:168
>> 0.0%    0x100410e03                                     call     +32(%rax)
>>                      bt_ape_decoder.cpp:168
>> 5.1%    0x100410e06                                     movss    %xmm0,
>> -68(%rbp)                       bt_ape_decoder.cpp:168
>> 0.0%    0x100410e0b                                     movss
>>  -68(%rbp), %xmm0                       bt_ape_decoder.cpp:168
>> 6.9%    0x100410e10                                     addss
>>  -56(%rbp), %xmm0                       bt_ape_decoder.cpp:168
>> 10.2%   0x100410e15                                     movss    %xmm0,
>> -56(%rbp)                       bt_ape_decoder.cpp:168
>> 6.1%    0x100410e1a                                     movl     ëx,
>> ìx                     stl_vector.h:166
>> 0.0%    0x100410e1c                                     movq     +8(%r15),
>> %rax                 stl_vector.h:166
>> 0.0%    0x100410e20                                     movq     (%rax),
>> %rdx                   stl_vector.h:343
>> 0.0%    0x100410e23                                     movq     +8(%rax),
>> %rax                 stl_vector.h:361
>> 6.0%    0x100410e27                                     incq     %rbx
>>               bt_ape_decoder.cpp:403
>> 0.0%    0x100410e2a                                     subq     %rdx,
>> %rax                     bt_ape_matrix.h:166
>> 0.0%    0x100410e2d                                     sarq     $3, %rax
>>                       bt_ape_matrix.h:166
>> 0.0%    0x100410e31                                     cmpq     %rax,
>> %rcx                     bt_ape_matrix.h:166
>> 6.1%    0x100410e34                                     jb
>> 0x0000000100410dec
>>  <BT_ApeDecoder::forwardViterbi(BT_ApeDecodeState&)+478>           Loop
>> end[6]  bt_ape_matrix.h:166
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>
>
> SSE is being used for scalar operations here.  Rather than use x87, the
> compiler defaults to using SSE scalar operations for floating point.  Shark
> is suggesting you use vector SSE operations.
>
> --
> Rick Altherr
> Performance Tools
> Development Technologies
> email@hidden
>
>
>
>
>

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References: 
 >Shark suggests SSE on code that uses .... SSE (From: Benson Margulies <email@hidden>)
 >Re: Shark suggests SSE on code that uses .... SSE (From: Rick Altherr <email@hidden>)

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