diff options
| -rw-r--r-- | rts/sm/GCThread.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/rts/sm/GCThread.h b/rts/sm/GCThread.h index 42d20bb264..d4376f77a7 100644 --- a/rts/sm/GCThread.h +++ b/rts/sm/GCThread.h @@ -105,7 +105,7 @@ typedef struct step_workspace_ { GC thread object Every GC thread has one of these. It contains all the step specific - workspaces and other GC thread loacl information. At some later + workspaces and other GC thread local information. At some later point it maybe useful to move this other into the TLS store of the GC threads ------------------------------------------------------------------------- */ @@ -185,7 +185,13 @@ extern gc_thread **gc_threads; /* ----------------------------------------------------------------------------- The gct variable is thread-local and points to the current thread's gc_thread structure. It is heavily accessed, so we try to put gct - into a global register variable if possible. + into a global register variable if possible; if we don't have a + register then use gcc's __thread extension to create a thread-local + variable. + + Even on x86 where registers are scarce, it is worthwhile using a + register variable here: I measured about a 2-5% slowdown with the + __thread version. -------------------------------------------------------------------------- */ #define GLOBAL_REG_DECL(type,name,reg) register type name REG(reg); |