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JIT threshold controlled by environment variable

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* libguile/jit.c (scm_jit_counter_threshold): Make a static variable
  instead of a compile-time constant.
  (scm_init_jit): Init scm_jit_counter_threshold from
  GUILE_JIT_COUNTER_THRESHOLD environment variable.  Default is -1
  indicating "never JIT".
* libguile/vm-engine.c (instrument-entry, instrument-loop): Adapt to new
  variable.
This commit is contained in:
Andy Wingo 2018-08-31 11:28:38 +02:00
parent def671974c
commit cc997293e2
3 changed files with 10 additions and 3 deletions
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3
libguile/jit.h
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@ -48,10 +48,11 @@ enum scm_jit_counter_value
{
SCM_JIT_COUNTER_ENTRY_INCREMENT = 15,
SCM_JIT_COUNTER_LOOP_INCREMENT = 1,
SCM_JIT_COUNTER_THRESHOLD = 50
};
#endif
SCM_INTERNAL uint32_t scm_jit_counter_threshold;
SCM_INTERNAL const uint8_t *scm_jit_compute_mcode (scm_thread *thread,
struct scm_jit_function_data *data);
SCM_INTERNAL void scm_jit_enter_mcode (scm_thread *thread,