Store estimated istrances in compressed_size
elf_x86_64_convert_load is very time consuming since it is called on each input section and has a loop over input text sections to estimate the branch distrance. We can store the estimated distrances in the compressed_size field of the output section, which is only used to decompress the compressed input section. Before the patch, linking clang 3.9 takes 52 seconds. After the patch, it only takes 2.5 seconds. PR ld/19542 * elf64-x86-64.c (elf_x86_64_convert_load): Store the estimated distrances in the compressed_size field of the output section.
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@ -1,3 +1,9 @@
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2016-02-02 H.J. Lu <hongjiu.lu@intel.com>
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PR ld/19542
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* elf64-x86-64.c (elf_x86_64_convert_load): Store the estimated
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distrances in the compressed_size field of the output section.
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2016-02-02 Alan Modra <amodra@gmail.com>
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2016-02-02 Alan Modra <amodra@gmail.com>
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* elf64-ppc.c (ppc64_elf_relocate_section): Further restrict
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* elf64-ppc.c (ppc64_elf_relocate_section): Further restrict
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@ -3190,35 +3190,43 @@ elf_x86_64_convert_load (bfd *abfd, asection *sec,
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}
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}
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else
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else
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{
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{
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asection *asect;
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bfd_signed_vma distance;
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bfd_size_type size;
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/* At this point, we don't know the load addresses of TSEC
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/* At this point, we don't know the load addresses of TSEC
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section nor SEC section. We estimate the distrance between
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section nor SEC section. We estimate the distrance between
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SEC and TSEC. */
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SEC and TSEC. We store the estimated distrances in the
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size = 0;
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compressed_size field of the output section, which is only
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for (asect = sec->output_section;
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used to decompress the compressed input section. */
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asect != NULL && asect != tsec->output_section;
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if (sec->output_section->compressed_size == 0)
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asect = asect->next)
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{
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{
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asection *i;
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asection *asect;
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for (i = asect->output_section->map_head.s;
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bfd_size_type size = 0;
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i != NULL;
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for (asect = link_info->output_bfd->sections;
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i = i->map_head.s)
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asect != NULL;
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asect = asect->next)
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{
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{
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size = align_power (size, i->alignment_power);
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asection *i;
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size += i->size;
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for (i = asect->map_head.s;
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i != NULL;
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i = i->map_head.s)
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{
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size = align_power (size, i->alignment_power);
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size += i->size;
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}
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asect->compressed_size = size;
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}
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}
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}
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}
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/* Don't convert GOTPCREL relocations if TSEC isn't placed
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/* Don't convert GOTPCREL relocations if TSEC isn't placed
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after SEC. */
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after SEC. */
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if (asect == NULL)
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distance = (tsec->output_section->compressed_size
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- sec->output_section->compressed_size);
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if (distance < 0)
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continue;
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continue;
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/* Take PT_GNU_RELRO segment into account by adding
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/* Take PT_GNU_RELRO segment into account by adding
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maxpagesize. */
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maxpagesize. */
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if ((toff + size + maxpagesize - roff + 0x80000000)
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if ((toff + distance + maxpagesize - roff + 0x80000000)
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> 0xffffffff)
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> 0xffffffff)
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continue;
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continue;
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}
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}
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