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Protect __TMC_END__ - __TMC_LIST__ == 0 

2016-11-20  Marc Glisse  <marc.glisse@inria.fr>

        PR libgcc/77813
        * crtstuff.c (deregister_tm_clones, register_tm_clones): Hide
        __TMC_END__ behind a passthrough asm.

From-SVN: r242635
This commit is contained in:
Marc Glisse 2016-11-20 13:35:27 +00:00
parent 0021284370
commit 62a7df9f59
2 changed files with 15 additions and 3 deletions
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8
libgcc/ChangeLog
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@ -1,6 +1,12 @@
2016-11-20 Marc Glisse <marc.glisse@inria.fr>
PR libgcc/77813
* crtstuff.c (deregister_tm_clones, register_tm_clones): Hide
__TMC_END__ behind a passthrough asm.
2016-11-18 Walter Lee <walt@tilera.com>
* config.host (tilepro*-*-linux*): Add t-slibgcc-libgcc to tmake_file.
* config.host (tilepro*-*-linux*): Add t-slibgcc-libgcc to tmake_file.
2016-11-17 Andrew Senkevich <andrew.senkevich@intel.com>

10
libgcc/crtstuff.c
View File

@ -280,7 +280,10 @@ deregister_tm_clones (void)
void (*fn) (void *);
#ifdef HAVE_GAS_HIDDEN
if (__TMC_END__ - __TMC_LIST__ == 0)
func_ptr *end = __TMC_END__;
// Do not optimize the comparison to false.
__asm ("" : "+g" (end));
if (__TMC_LIST__ == end)
return;
#else
if (__TMC_LIST__[0] == NULL)
@ -300,7 +303,10 @@ register_tm_clones (void)
size_t size;
#ifdef HAVE_GAS_HIDDEN
size = (__TMC_END__ - __TMC_LIST__) / 2;
func_ptr *end = __TMC_END__;
// Do not optimize the comparison to false.
__asm ("" : "+g" (end));
size = (end - __TMC_LIST__) / 2;
#else
for (size = 0; __TMC_LIST__[size * 2] != NULL; size++)
continue;