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box-cas!: less JIT-generated work if the boolean result is ignored

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This commit is contained in:
Matthew Flatt 2013-09-25 11:45:53 -04:00
parent 3b669c3c82
commit 162edd099d
1 changed files with 13 additions and 6 deletions
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19
racket/src/racket/src/jitinline.c
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@ -3650,7 +3650,10 @@ int scheme_generate_inlined_nary(mz_jit_state *jitter, Scheme_App_Rec *app, int
#ifdef MZ_USE_FUTURES #ifdef MZ_USE_FUTURES
if (scheme_is_multithreaded(0)) { if (scheme_is_multithreaded(0)) {
jit_lock_cmpxchgr_l(JIT_R1, JIT_V1); /* implicitly uses JIT_R0 */ jit_lock_cmpxchgr_l(JIT_R1, JIT_V1); /* implicitly uses JIT_R0 */
reffalse = (JNEm(jit_forward(), 0,0,0), jit_get_ip()); if (result_ignored)
reffalse = NULL;
else
reffalse = (JNEm(jit_forward(), 0,0,0), jit_get_ip());
} else } else
#endif #endif
{ {
@ -3665,13 +3668,17 @@ int scheme_generate_inlined_nary(mz_jit_state *jitter, Scheme_App_Rec *app, int
scheme_add_branch_false(for_branch, reffalse); scheme_add_branch_false(for_branch, reffalse);
__END_SHORT_JUMPS__(branch_short); __END_SHORT_JUMPS__(branch_short);
} else { } else {
(void)jit_movi_p(dest, scheme_true); if (!result_ignored) {
reftrue = jit_jmpi(jit_forward()); (void)jit_movi_p(dest, scheme_true);
reftrue = jit_jmpi(jit_forward());
mz_patch_branch(reffalse); mz_patch_branch(reffalse);
(void)jit_movi_p(dest, scheme_false); (void)jit_movi_p(dest, scheme_false);
mz_patch_branch(reftrue);
} else if (reffalse)
mz_patch_branch(reffalse);
mz_patch_branch(reftrue);
__END_TINY_JUMPS__(1); __END_TINY_JUMPS__(1);
} }