https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65701
--- Comment #5 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
The profile difference is:
52.31% facerec facerec [.] MAIN__.lto_priv.3
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16.68% facerec facerec [.] topcostfct.3487.lto_priv.4
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8.28% facerec facerec [.] __gaborroutines_MOD_gabortrafo
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7.91% facerec facerec [.] cfftb_
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7.20% facerec libgfortran.so.3 [.] _gfortrani_cshift0_r4
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2.76% facerec facerec [.] __fft2d_MOD_fft2db
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1.54% facerec facerec [.]
__graphroutines_MOD_graphsimfct.constprop.0
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0.53% facerec libc-2.13.so [.] __memcpy_ssse3
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(mainline) WRT
59.16% facerec facerec [.] MAIN__.lto_priv.3
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10.95% facerec facerec [.] __gaborroutines_MOD_gabortrafo
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10.51% facerec facerec [.] cfftb1_
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9.33% facerec libgfortran.so.3 [.] _gfortrani_cshift0_r4
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3.64% facerec facerec [.] __fft2d_MOD_fft2db
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2.07% facerec facerec [.]
__graphroutines_MOD_graphsimfct.constprop.0
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0.67% facerec libc-2.13.so [.] __memcpy_ssse3
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0.57% facerec libgfortran.so.3 [.] _gfortrani_read_radix
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0.43% facerec libgcc_s.so.1 [.] __udivti3
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0.36% facerec libgfortran.so.3 [.] formatted_transfer
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patch reverted. I wonder if we don't want to iline udivti... I suppose the
problem is that we no longer inline topcostfct which we do not inline
because...
not inlinable: localmove.constprop/304 -> topcostfct/208, --param
large-function-growth limit reached
while patched tree suceeds:
Inlining topcostfct size 1393.
Called once from localmove.constprop 740 insns.
Accounting size:1132.00, time:12187.80 on predicate:(true)
Bumping the large-function-insns limit up to 4000 makes the function to be
inlined but curiously enough causes further degradation. The profile is now:
66.35% facerec facerec [.] MAIN__.lto_priv.3
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8.93% facerec facerec [.] __gaborroutines_MOD_gabortrafo
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8.72% facerec facerec [.] cfftb_
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7.77% facerec libgfortran.so.3 [.] _gfortrani_cshift0_r4
�
2.96% facerec facerec [.] __fft2d_MOD_fft2db
�
1.68% facerec facerec [.]
__graphroutines_MOD_graphsimfct.constprop.0
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0.55% facerec libc-2.13.so [.] __memcpy_ssse3
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0.47% facerec libgfortran.so.3 [.] _gfortrani_read_radix
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0.34% facerec libgcc_s.so.1 [.] __udivti3
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0.30% facerec libgfortran.so.3 [.] formatted_transfer
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0.22% facerec libgfortran.so.3 [.] next_format0
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0.22% facerec facerec [.] cfftf_
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0.20% facerec libgfortran.so.3 [.] _gfortrani_read_block_form
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so basically identical except that mainline inlines cfftb1_ and the patched
tree inlines cfftb_ which is a wrapper. Perhaps the wrapper heuristics may be
generalized for this.
