[Guile-commits] 03/03: Micro-optimization of scm_vm placement in scm_thread

[Andy Wingo]

wingo pushed a commit to branch lightning
in repository guile.

commit 8bb9ae3b51aa5f16b6b364f5212c0f3a82136a2f
Author: Andy Wingo <address@hidden>
Date:   Fri Sep 14 09:39:29 2018 +0200

    Micro-optimization of scm_vm placement in scm_thread
    
    * libguile/threads.h (struct scm_thread): Move the embedded "struct
      scm_vm" earlier in the scm_thread.  Since the VM (and the JIT) access
      VM data (SP, FP, etc) through the thread pointer, this allows more
      accesses to be encoded in shorter instruction sequences.
---
 libguile/threads.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libguile/threads.h b/libguile/threads.h
index 1969f87..7ebd377 100644
--- a/libguile/threads.h
+++ b/libguile/threads.h
@@ -49,6 +49,9 @@ struct scm_thread_wake_data;
 struct scm_thread {
   struct scm_thread *next_thread;
 
+  /* VM state for this thread.  */
+  struct scm_vm vm;
+
   SCM handle;
   scm_i_pthread_t pthread;
 
@@ -104,9 +107,6 @@ struct scm_thread {
 
   /* JIT state; NULL until this thread needs to JIT-compile something.  */
   struct scm_jit_state *jit_state;
-
-  /* VM state for this thread.  */
-  struct scm_vm vm;
 };
 
 #define SCM_I_IS_THREAD(x)    SCM_SMOB_PREDICATE (scm_tc16_thread, x)