mjit_compile.c: resurrect local variable stack

This optimization was reverted on r63863, but this commit resurrects the
optimization to skip some sp motions on JIT execution.

tool/ruby_vm/views/_mjit_compile_insn_body.erb: ditto
tool/ruby_vm/views/_mjit_compile_insn.erb: ditto

insns.def: resurrect handles_frame as handles_stack, which was deleted
on r63763.
tool/ruby_vm/models/bare_instructions.rb: ditto

vm_insnhelper.c: prevent moving sp outside insns.def to allow modifying
it by JIT.

* Optcarrot benchmark

$ benchmark-driver benchmark.yml --rbenv 'before --jit;after --jit' --repeat-count 12 -v
before --jit: ruby 2.6.0dev (2018-07-17 trunk 63987) +JIT [x86_64-linux]
after --jit: ruby 2.6.0dev (2018-07-17 local-stack 63987) +JIT [x86_64-linux]
last_commit=mjit_compile.c: resurrect local variable stack
Calculating -------------------------------------
                         before --jit  after --jit
Optcarrot Lan_Master.nes       70.518       72.144 fps

Comparison:
             Optcarrot Lan_Master.nes
             after --jit:        72.1 fps
            before --jit:        70.5 fps - 1.02x  slower

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63988 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 16 insertions, 1 deletions

diff --git a/mjit_compile.c b/mjit_compile.c
index 1f92834853..5eafd72329 100644
--- a/mjit_compile.c
+++ b/mjit_compile.c
@@ -24,6 +24,9 @@
 struct compile_status {
     int success; /* has TRUE if compilation has had no issue */
     int *stack_size_for_pos; /* stack_size_for_pos[pos] has stack size for the position (otherwise -1) */
+    /* If TRUE, JIT-ed code will use local variables to store pushed values instead of
+       using VM's stack and moving stack pointer. */
+    int local_stack_p;
 };
 
 /* Storage to keep data which is consistent in each conditional branch.
@@ -172,7 +175,13 @@ compile_insns(FILE *f, const struct rb_iseq_constant_body *body, unsigned int st
 static void
 compile_cancel_handler(FILE *f, const struct rb_iseq_constant_body *body, struct compile_status *status)
 {
+    unsigned int i;
     fprintf(f, "\ncancel:\n");
+    if (status->local_stack_p) {
+        for (i = 0; i < body->stack_max; i++) {
+            fprintf(f, "    *((VALUE *)reg_cfp->bp + %d) = stack[%d];\n", i + 1, i);
+        }
+    }
     fprintf(f, "    return Qundef;\n");
 }
 
@@ -182,6 +191,7 @@ mjit_compile(FILE *f, const struct rb_iseq_constant_body *body, const char *func
 {
     struct compile_status status;
     status.success = TRUE;
+    status.local_stack_p = !body->catch_except_p;
     status.stack_size_for_pos = ALLOC_N(int, body->iseq_size);
     memset(status.stack_size_for_pos, NOT_COMPILED_STACK_SIZE, sizeof(int) * body->iseq_size);
 
@@ -195,7 +205,12 @@ mjit_compile(FILE *f, const struct rb_iseq_constant_body *body, const char *func
     fprintf(f, "__declspec(dllexport)\n");
 #endif
     fprintf(f, "VALUE\n%s(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp)\n{\n", funcname);
-    fprintf(f, "    VALUE *stack = reg_cfp->sp;\n");
+    if (status.local_stack_p) {
+        fprintf(f, "    VALUE stack[%d];\n", body->stack_max);
+    }
+    else {
+        fprintf(f, "    VALUE *stack = reg_cfp->sp;\n");
+    }
     fprintf(f, "    static const VALUE *const original_body_iseq = (VALUE *)0x%"PRIxVALUE";\n",
             (VALUE)body->iseq_encoded);