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Fix pow() optimization inconsistencies.

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This commit is contained in:
Mike Pall
2022-01-24 14:37:50 +01:00
parent c18acfe756
commit 9512d5c1ac
15 changed files with 114 additions and 205 deletions
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12
src/lj_opt_narrow.c
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@@ -590,20 +590,14 @@ 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);
/* Narrowing must be unconditional to preserve (-x)^i semantics. */
if (tvisint(vc) || numisint(numV(vc))) {
int checkrange = 0;
/* pow() is faster for bigger exponents. But do this only for (+k)^i. */
if (tref_isk(rb) && (int32_t)ir_knum(IR(tref_ref(rb)))->u32.hi >= 0) {
int32_t k = numberVint(vc);
if (!(k >= -65536 && k <= 65536)) goto force_pow_num;
checkrange = 1;
}
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 (checkrange && !tref_isk(rc)) { /* Range guard: -65536 <= i <= 65536 */
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));
}