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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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6
libguile/jit.c
View file

@ -32,6 +32,7 @@
#include "gsubr.h" #include "gsubr.h"
#include "instructions.h" #include "instructions.h"
#include "intrinsics.h" #include "intrinsics.h"
#include "simpos.h" /* scm_getenv_int */
#include "threads.h" #include "threads.h"
#include "vm-builtins.h" #include "vm-builtins.h"
#include "vm-operations.h" #include "vm-operations.h"
@ -121,6 +122,10 @@
/* Threshold for when to JIT-compile a function. Set from the
GUILE_JIT_THRESHOLD environment variable. */
uint32_t scm_jit_counter_threshold = -1;
/* Entry trampoline: saves registers, initializes THREAD and SP /* Entry trampoline: saves registers, initializes THREAD and SP
registers, and jumps into mcode. */ registers, and jumps into mcode. */
static void (*enter_mcode) (scm_thread *thread, const uint8_t *mcode); static void (*enter_mcode) (scm_thread *thread, const uint8_t *mcode);
@ -4465,5 +4470,6 @@ scm_jit_state_free (scm_jit_state *j)
void void
scm_init_jit (void) scm_init_jit (void)
{ {
scm_jit_counter_threshold = scm_getenv_int ("GUILE_JIT_COUNTER_THRESHOLD", -1);
scm_c_define_gsubr ("%jit-compile", 1, 0, 0, (scm_t_subr) scm_sys_jit_compile); scm_c_define_gsubr ("%jit-compile", 1, 0, 0, (scm_t_subr) scm_sys_jit_compile);
} }

3
libguile/jit.h
View file

@ -48,10 +48,11 @@ enum scm_jit_counter_value
{ {
SCM_JIT_COUNTER_ENTRY_INCREMENT = 15, SCM_JIT_COUNTER_ENTRY_INCREMENT = 15,
SCM_JIT_COUNTER_LOOP_INCREMENT = 1, SCM_JIT_COUNTER_LOOP_INCREMENT = 1,
SCM_JIT_COUNTER_THRESHOLD = 50
}; };
#endif #endif
SCM_INTERNAL uint32_t scm_jit_counter_threshold;
SCM_INTERNAL const uint8_t *scm_jit_compute_mcode (scm_thread *thread, SCM_INTERNAL const uint8_t *scm_jit_compute_mcode (scm_thread *thread,
struct scm_jit_function_data *data); struct scm_jit_function_data *data);
SCM_INTERNAL void scm_jit_enter_mcode (scm_thread *thread, SCM_INTERNAL void scm_jit_enter_mcode (scm_thread *thread,

4
libguile/vm-engine.c
View file

@ -471,7 +471,7 @@ VM_NAME (scm_thread *thread)
NEXT (0); NEXT (0);
} }
if (data->counter > SCM_JIT_COUNTER_THRESHOLD) if (data->counter > scm_jit_counter_threshold)
{ {
const uint8_t *mcode; const uint8_t *mcode;
@ -722,7 +722,7 @@ VM_NAME (scm_thread *thread)
data = (struct scm_jit_function_data *) (ip + data_offset); data = (struct scm_jit_function_data *) (ip + data_offset);
if (data->counter > SCM_JIT_COUNTER_THRESHOLD) if (data->counter > scm_jit_counter_threshold)
{ {
const uint8_t *mcode; const uint8_t *mcode;