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authorWill Newton <will.newton@linaro.org>2014-04-11 14:39:56 +0100
committerWill Newton <will.newton@linaro.org>2014-06-23 14:13:31 +0100
commitcc7d044752ded296cf737c311f786e87b88180ec (patch)
tree16ba6e4e35e362c85c428334173449a938cd603b /elf/dl-lookup.c
parentd6d062255489343810ad1e01d05f70acd9cd1918 (diff)
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elf/dl-lookup.c: Use __glibc_likely and __glibc_unlikely
Convert all uses of __builtin_expect to __glibc_likely and __glibc_unlikely. Most of these are trivial boolean expressions but a few were not. In particular the use of __builtin_expect in the switch expression in do_lookup_x has been removed. Verified that there are no code changes on x86_64 and ARM aside from line numbers. ChangeLog: 2014-06-23 Will Newton <will.newton@linaro.org> * elf/dl-lookup.c: Use __glibc_unlikely and __glibc_likely rather than __builtin_expect.
Diffstat (limited to 'elf/dl-lookup.c')
-rw-r--r--elf/dl-lookup.c39
1 files changed, 19 insertions, 20 deletions
diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c
index 1c6ca89..7c32830 100644
--- a/elf/dl-lookup.c
+++ b/elf/dl-lookup.c
@@ -92,11 +92,10 @@ check_match (const char *const undef_name,
{
unsigned int stt = ELFW(ST_TYPE) (sym->st_info);
assert (ELF_RTYPE_CLASS_PLT == 1);
- if (__builtin_expect ((sym->st_value == 0 /* No value. */
+ if (__glibc_unlikely ((sym->st_value == 0 /* No value. */
&& stt != STT_TLS)
|| ELF_MACHINE_SYM_NO_MATCH (sym)
- || (type_class & (sym->st_shndx == SHN_UNDEF)),
- 0))
+ || (type_class & (sym->st_shndx == SHN_UNDEF))))
return NULL;
/* Ignore all but STT_NOTYPE, STT_OBJECT, STT_FUNC,
@@ -405,8 +404,8 @@ do_lookup_x (const char *undef_name, uint_fast32_t new_hash,
unsigned int hashbit2 = ((new_hash >> map->l_gnu_shift)
& (__ELF_NATIVE_CLASS - 1));
- if (__builtin_expect ((bitmask_word >> hashbit1)
- & (bitmask_word >> hashbit2) & 1, 0))
+ if (__glibc_unlikely ((bitmask_word >> hashbit1)
+ & (bitmask_word >> hashbit2) & 1))
{
Elf32_Word bucket = map->l_gnu_buckets[new_hash
% map->l_nbuckets];
@@ -461,7 +460,7 @@ do_lookup_x (const char *undef_name, uint_fast32_t new_hash,
if (sym != NULL)
{
found_it:
- switch (__builtin_expect (ELFW(ST_BIND) (sym->st_info), STB_GLOBAL))
+ switch (ELFW(ST_BIND) (sym->st_info))
{
case STB_WEAK:
/* Weak definition. Use this value if we don't find another. */
@@ -495,7 +494,7 @@ do_lookup_x (const char *undef_name, uint_fast32_t new_hash,
/* If this current map is the one mentioned in the verneed entry
and we have not found a weak entry, it is a bug. */
if (symidx == STN_UNDEF && version != NULL && version->filename != NULL
- && __builtin_expect (_dl_name_match_p (version->filename, map), 0))
+ && __glibc_unlikely (_dl_name_match_p (version->filename, map)))
return -1;
}
while (++i < n);
@@ -776,7 +775,7 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
if (res > 0)
break;
- if (__builtin_expect (res, 0) < 0 && skip_map == NULL)
+ if (__glibc_unlikely (res < 0) && skip_map == NULL)
{
/* Oh, oh. The file named in the relocation entry does not
contain the needed symbol. This code is never reached
@@ -857,7 +856,7 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
in the global scope which was dynamically loaded. In this case
we have to prevent the latter from being unloaded unless the
UNDEF_MAP object is also unloaded. */
- if (__builtin_expect (current_value.m->l_type == lt_loaded, 0)
+ if (__glibc_unlikely (current_value.m->l_type == lt_loaded)
/* Don't do this for explicit lookups as opposed to implicit
runtime lookups. */
&& (flags & DL_LOOKUP_ADD_DEPENDENCY) != 0
@@ -874,8 +873,8 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
if (__glibc_unlikely (current_value.m->l_used == 0))
current_value.m->l_used = 1;
- if (__builtin_expect (GLRO(dl_debug_mask)
- & (DL_DEBUG_BINDINGS|DL_DEBUG_PRELINK), 0))
+ if (__glibc_unlikely (GLRO(dl_debug_mask)
+ & (DL_DEBUG_BINDINGS|DL_DEBUG_PRELINK)))
_dl_debug_bindings (undef_name, undef_map, ref,
&current_value, version, type_class, protected);
@@ -892,9 +891,9 @@ _dl_setup_hash (struct link_map *map)
{
Elf_Symndx *hash;
- if (__builtin_expect (map->l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM
+ if (__glibc_likely (map->l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM
+ DT_THISPROCNUM + DT_VERSIONTAGNUM
- + DT_EXTRANUM + DT_VALNUM] != NULL, 1))
+ + DT_EXTRANUM + DT_VALNUM] != NULL))
{
Elf32_Word *hash32
= (void *) D_PTR (map, l_info[DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM
@@ -973,10 +972,10 @@ _dl_debug_bindings (const char *undef_name, struct link_map *undef_map,
type_class, undef_map);
if (val.s != value->s || val.m != value->m)
conflict = 1;
- else if (__builtin_expect (undef_map->l_symbolic_in_local_scope, 0)
+ else if (__glibc_unlikely (undef_map->l_symbolic_in_local_scope)
&& val.s
- && __builtin_expect (ELFW(ST_BIND) (val.s->st_info),
- STB_GLOBAL) == STB_GNU_UNIQUE)
+ && __glibc_unlikely (ELFW(ST_BIND) (val.s->st_info)
+ == STB_GNU_UNIQUE))
{
/* If it is STB_GNU_UNIQUE and undef_map's l_local_scope
contains any DT_SYMBOLIC libraries, unfortunately there
@@ -1010,11 +1009,11 @@ _dl_debug_bindings (const char *undef_name, struct link_map *undef_map,
if (value->s)
{
- if (__builtin_expect (ELFW(ST_TYPE) (value->s->st_info)
- == STT_TLS, 0))
+ if (__glibc_unlikely (ELFW(ST_TYPE) (value->s->st_info)
+ == STT_TLS))
type_class = 4;
- else if (__builtin_expect (ELFW(ST_TYPE) (value->s->st_info)
- == STT_GNU_IFUNC, 0))
+ else if (__glibc_unlikely (ELFW(ST_TYPE) (value->s->st_info)
+ == STT_GNU_IFUNC))
type_class |= 8;
}