https://sourceware.org/bugzilla/show_bug.cgi?id=18427
Bug ID: 18427
Summary: GNU as slow on hppa architecture
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: deller at gmx dot de
CC: dave.anglin at bell dot net
Target Milestone: ---
Target: hppa
Created attachment 8323
--> https://sourceware.org/bugzilla/attachment.cgi?id=8323&action=edit
preprocessed assembler testcase
I noticed that the GNU assembler is sometimes incredible slow with assembly of
C++ files on hppa.
Because of that I did a gprof analysis (using the cross-assembler for hppa
running on x86_64) while running gas on a somewhat bigger assembler file
(preprocessed from the debian vtk package).
Here is the result, and it's pretty clear:
Flat profile:
Each sample counts as 0.01 seconds.
% cumulative self self total
time seconds seconds calls ms/call ms/call name
81.76 86.38 86.38 821598 0.11 0.11 pa_undefine_label
3.34 89.91 3.53 194747 0.02 0.02 pa_define_label
1.66 91.66 1.75 read_a_source_file
1.13 92.85 1.19 2442950 0.00 0.00 frag_offset_fixed_p
0.73 93.62 0.77 660 1.17 1.17 do_scrub_chars
0.63 94.29 0.67 symbol_print_statistics
0.55 94.87 0.58 1414839 0.00 0.00 operand
0.46 95.36 0.49 3866615 0.00 0.00 frag_now_fix
...
0.00 105.65 0.00 1 0.00 76.43
resolve_local_symbol_values
0.00 105.65 0.00 1 0.00 0.00 s_app_file
0.00 105.65 0.00 1 0.00 0.01 s_space
0.00 105.65 0.00 1 0.00 0.00 s_weakref
0.00 105.65 0.00 1 0.00 0.00 symbol_insert
So, the pa_undefine_label() function seems problematic.
I talked to Dave Anglin about that issue, and he came up with the attached
patch. This patch seems to work and speeds up gas a lot, but it will most
likely break HP-UX (which uses multiple segments).
Maybe the experts here have some other idea?
A gzipped-testcase which expands to a 21MB assembler-file is attached.
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