DrSocalkwe3n/luajit
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Add special bytecodes for builtins.

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BC_ISTYPE, BC_ISNUM: fast type checks/coercions.
BC_TGETR, BC_TSETR: fast rawgeti/rawseti, no type checks for table/key.
This commit is contained in:
Mike Pall
2013-02-23 02:09:19 +01:00
parent b359ce804b
commit 73ef845fca
16 changed files with 614 additions and 38 deletions
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32
src/host/buildvm_lib.c
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@@ -5,6 +5,7 @@
#include "buildvm.h"
#include "lj_obj.h"
#include "lj_bc.h"
#include "lj_lib.h"
#include "buildvm_libbc.h"
@@ -152,28 +153,36 @@ static void libdef_func(BuildCtx *ctx, char *p, int arg)
regfunc = REGFUNC_OK;
}
static uint32_t libdef_uleb128(uint8_t **pp)
static uint8_t *libdef_uleb128(uint8_t *p, uint32_t *vv)
{
uint8_t *p = *pp;
uint32_t v = *p++;
if (v >= 0x80) {
int sh = 0; v &= 0x7f;
do { v |= ((*p & 0x7f) << (sh += 7)); } while (*p++ >= 0x80);
}
*pp = p;
return v;
*vv = v;
return p;
}
static void libdef_swapbc(uint8_t *p)
static void libdef_fixupbc(uint8_t *p)
{
uint32_t i, sizebc;
p += 4;
libdef_uleb128(&p);
libdef_uleb128(&p);
sizebc = libdef_uleb128(&p);
p = libdef_uleb128(p, &sizebc);
p = libdef_uleb128(p, &sizebc);
p = libdef_uleb128(p, &sizebc);
for (i = 0; i < sizebc; i++, p += 4) {
uint8_t t = p[0]; p[0] = p[3]; p[3] = t;
t = p[1]; p[1] = p[2]; p[2] = t;
uint8_t op = p[libbc_endian ? 3 : 0];
uint8_t ra = p[libbc_endian ? 2 : 1];
uint8_t rc = p[libbc_endian ? 1 : 2];
uint8_t rb = p[libbc_endian ? 0 : 3];
if (!LJ_DUALNUM && op == BC_ISTYPE && rc == ~LJ_TNUMX+1) {
op = BC_ISNUM; rc++;
}
p[LJ_ENDIAN_SELECT(0, 3)] = op;
p[LJ_ENDIAN_SELECT(1, 2)] = ra;
p[LJ_ENDIAN_SELECT(2, 1)] = rc;
p[LJ_ENDIAN_SELECT(3, 0)] = rb;
}
}
@@ -190,8 +199,7 @@ static void libdef_lua(BuildCtx *ctx, char *p, int arg)
*optr++ = LIBINIT_LUA;
libdef_name(p, 0);
memcpy(optr, libbc_code + ofs, len);
if (libbc_endian != LJ_BE)
libdef_swapbc(optr);
libdef_fixupbc(optr);
optr += len;
return;
}