Re: Shark suggests SSE on code that uses .... SSE
Re: Shark suggests SSE on code that uses .... SSE
- Subject: Re: Shark suggests SSE on code that uses .... SSE
- From: Rick Altherr <email@hidden>
- Date: Tue, 14 Apr 2009 13:43:12 -0700
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, �x bt_ape_decoder.cpp:168
5.0% 0x100410df9 movl %r13d, �x 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 �x, �x 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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