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YJIT: use a flat array for finding codegen functions

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Simpler and faster.
This commit is contained in:
Alan Wu 2021-03-18 09:13:13 -04:00
parent 927ead9f75
commit c04e5188d5
1 changed files with 9 additions and 14 deletions
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23
yjit_codegen.c
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@ -17,7 +17,7 @@
#include "yjit_utils.h"
// Map from YARV opcodes to code generation functions
static st_table *gen_fns;
static codegen_fn gen_fns[VM_INSTRUCTION_SIZE] = { NULL };
// Code block into which we write machine code
static codeblock_t block;
@ -299,10 +299,11 @@ yjit_gen_block(ctx_t* ctx, block_t* block, rb_execution_context_t* ec)
// Get the current opcode
int opcode = jit_get_opcode(&jit);
RUBY_ASSERT(opcode >= 0 && opcode < VM_INSTRUCTION_SIZE);
// Lookup the codegen function for this instruction
codegen_fn gen_fn;
if (!rb_st_lookup(gen_fns, opcode, (st_data_t*)&gen_fn)) {
codegen_fn gen_fn = gen_fns[opcode];
if (!gen_fn) {
// If we reach an unknown instruction,
// exit to the interpreter and stop compiling
yjit_gen_exit(&jit, ctx, cb);
@ -1819,15 +1820,14 @@ gen_opt_getinlinecache(jitstate_t *jit, ctx_t *ctx)
return YJIT_END_BLOCK;
}
void yjit_reg_op(int opcode, codegen_fn gen_fn)
static void
yjit_reg_op(int opcode, codegen_fn gen_fn)
{
RUBY_ASSERT(opcode >= 0 && opcode < VM_INSTRUCTION_SIZE);
// Check that the op wasn't previously registered
st_data_t st_gen;
if (rb_st_lookup(gen_fns, opcode, &st_gen)) {
rb_bug("op already registered");
}
RUBY_ASSERT(gen_fns[opcode] == NULL);
st_insert(gen_fns, (st_data_t)opcode, (st_data_t)gen_fn);
gen_fns[opcode] = gen_fn;
}
void
@ -1841,9 +1841,6 @@ yjit_init_codegen(void)
ocb = &outline_block;
cb_init(ocb, mem_block + mem_size/2, mem_size/2);
// Initialize the codegen function table
gen_fns = rb_st_init_numtable();
// Map YARV opcodes to the corresponding codegen functions
yjit_reg_op(BIN(dup), gen_dup);
yjit_reg_op(BIN(nop), gen_nop);
@ -1865,8 +1862,6 @@ yjit_init_codegen(void)
yjit_reg_op(BIN(opt_and), gen_opt_and);
yjit_reg_op(BIN(opt_minus), gen_opt_minus);
yjit_reg_op(BIN(opt_plus), gen_opt_plus);
// Map branch instruction opcodes to codegen functions
yjit_reg_op(BIN(opt_getinlinecache), gen_opt_getinlinecache);
yjit_reg_op(BIN(branchif), gen_branchif);
yjit_reg_op(BIN(branchunless), gen_branchunless);