DrSocalkwe3n/luajit
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Revert to trival pow() optimizations to prevent inaccuracies.

Browse Source
This commit is contained in:
Mike Pall
2022-03-08 19:44:10 +01:00
parent aa0550e3f0
commit 96d6d50320
18 changed files with 45 additions and 157 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/lj_opt_narrow.c
View File

@@ -584,30 +584,6 @@ TRef lj_opt_narrow_mod(jit_State *J, TRef rb, TRef rc, TValue *vb, TValue *vc)
return emitir(IRTN(IR_SUB), rb, tmp);
}
/* Narrowing of power operator or math.pow. */
TRef lj_opt_narrow_pow(jit_State *J, TRef rb, TRef rc, TValue *vb, TValue *vc)
{
rb = conv_str_tonum(J, rb, vb);
rb = lj_ir_tonum(J, rb); /* Left arg is always treated as an FP number. */
rc = conv_str_tonum(J, rc, vc);
if (tvisint(vc) || numisint(numV(vc))) {
int32_t k = numberVint(vc);
if (!(k >= -65536 && k <= 65536)) goto force_pow_num;
if (!tref_isinteger(rc)) {
/* Guarded conversion to integer! */
rc = emitir(IRTGI(IR_CONV), rc, IRCONV_INT_NUM|IRCONV_CHECK);
}
if (!tref_isk(rc)) { /* Range guard: -65536 <= i <= 65536 */
TRef tmp = emitir(IRTI(IR_ADD), rc, lj_ir_kint(J, 65536));
emitir(IRTGI(IR_ULE), tmp, lj_ir_kint(J, 2*65536));
}
} else {
force_pow_num:
rc = lj_ir_tonum(J, rc); /* Want POW(num, num), not POW(num, int). */
}
return emitir(IRTN(IR_POW), rb, rc);
}
/* -- Predictive narrowing of induction variables ------------------------- */
/* Narrow a single runtime value. */