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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-05-07 09:13:39 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-05-07 09:19:16 -0700 |
| commit | b084df0b8d1262fb1e969c74bcc5c61e262a6199 (patch) | |
| tree | dce3ec5097f44350ac9f84259ce24aa0ef454330 /gas/config | |
| parent | 1c56a84d9bac1f6a451a89d2c6af3d7078c4290e (diff) | |
| download | gdb-b084df0b8d1262fb1e969c74bcc5c61e262a6199.zip gdb-b084df0b8d1262fb1e969c74bcc5c61e262a6199.tar.gz gdb-b084df0b8d1262fb1e969c74bcc5c61e262a6199.tar.bz2 | |
Optimize branches to non-weak symbols with visibility
Branches to global non-weak symbols defined in the same segment with
non-default visibility can be optimized the same way as branches to
local symbols.
gas/
* config/tc-i386.c (elf_symbol_resolved_in_segment_p): New.
(md_estimate_size_before_relax): Use it.
gas/testsuite/
* gas/i386/i386.exp: Run relax-3 and x86-64-relax-2.
* gas/i386/relax-3.d: New file.
* gas/i386/relax-3.s: Likewise.
* gas/i386/x86-64-relax-2.d: Likewise.
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/tc-i386.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 50f9cb4..c4ba13d 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -8772,6 +8772,25 @@ i386_frag_max_var (fragS *frag) return TYPE_FROM_RELAX_STATE (frag->fr_subtype) == UNCOND_JUMP ? 4 : 5; } +#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) +static int +elf_symbol_resolved_in_segment_p (symbolS *fr_symbol) +{ + /* STT_GNU_IFUNC symbol must go through PLT. */ + if ((symbol_get_bfdsym (fr_symbol)->flags + & BSF_GNU_INDIRECT_FUNCTION) != 0) + return 0; + + if (!S_IS_EXTERNAL (fr_symbol)) + /* Symbol may be weak or local. */ + return !S_IS_WEAK (fr_symbol); + + /* Global symbols with default visibility in a shared library may be + preempted by another definition. */ + return ELF_ST_VISIBILITY (S_GET_OTHER (fr_symbol)) != STV_DEFAULT; +} +#endif + /* md_estimate_size_before_relax() Called just before relax() for rs_machine_dependent frags. The x86 @@ -8795,10 +8814,7 @@ md_estimate_size_before_relax (fragS *fragP, segT segment) if (S_GET_SEGMENT (fragP->fr_symbol) != segment #if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF) || (IS_ELF - && (S_IS_EXTERNAL (fragP->fr_symbol) - || S_IS_WEAK (fragP->fr_symbol) - || ((symbol_get_bfdsym (fragP->fr_symbol)->flags - & BSF_GNU_INDIRECT_FUNCTION)))) + && !elf_symbol_resolved_in_segment_p (fragP->fr_symbol)) #endif #if defined (OBJ_COFF) && defined (TE_PE) || (OUTPUT_FLAVOR == bfd_target_coff_flavour |