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add clang-compatible thread-pointer code for mips 

clang does not presently support the "v" constraint we want to use to
get the result from $3, and trying to use register...__asm__("$3") to
do the same invokes serious compiler bugs. so for now, i'm working
around the issue with an extra temp register and putting $3 in the
clobber list instead of using it as output. when the bugs in clang are
fixed, this issue should be revisited to generate smaller/faster code
like what gcc gets.
This commit is contained in:
Rich Felker 2012-09-07 12:18:14 -04:00
parent b9bb8f67bb
commit 9f65796c35
1 changed files with 4 additions and 0 deletions
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4
arch/mips/pthread_arch.h
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@ -1,7 +1,11 @@
static inline struct pthread *__pthread_self() static inline struct pthread *__pthread_self()
{ {
struct pthread *self; struct pthread *self;
#ifdef __clang__
__asm__ __volatile__ (".word 0x7c03e83b ; move %0, $3" : "=r" (self) : : "$3" );
#else
__asm__ __volatile__ (".word 0x7c03e83b" : "=v" (self) ); __asm__ __volatile__ (".word 0x7c03e83b" : "=v" (self) );
#endif
return self; return self;
} }