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DUALNUM: Narrow result of math.floor() and math.ceil().

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This commit is contained in:
Mike Pall 2011-03-15 18:15:42 +01:00
parent dcbae09b1d
commit 6299485000
1 changed files with 11 additions and 3 deletions
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14
src/lj_ffrecord.c
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@ -414,9 +414,17 @@ static void LJ_FASTCALL recff_math_abs(jit_State *J, RecordFFData *rd)
/* Record rounding functions math.floor and math.ceil. */
static void LJ_FASTCALL recff_math_round(jit_State *J, RecordFFData *rd)
{
if (!tref_isinteger(J->base[0])) /* Pass through integers unmodified. */
J->base[0] = emitir(IRTN(IR_FPMATH), lj_ir_tonum(J, J->base[0]), rd->data);
/* Note: result is integral (or NaN/Inf), but may not fit into an integer. */
TRef tr = J->base[0];
if (!tref_isinteger(tr)) { /* Pass through integers unmodified. */
tr = emitir(IRTN(IR_FPMATH), lj_ir_tonum(J, tr), rd->data);
/* Result is integral (or NaN/Inf), but may not fit an int32_t. */
if (LJ_DUALNUM) { /* Try to narrow using a guarded conversion to int. */
lua_Number n = lj_vm_foldfpm(numberVnum(&rd->argv[0]), rd->data);
if (n == (lua_Number)lj_num2int(n))
tr = emitir(IRTGI(IR_CONV), tr, IRCONV_INT_NUM|IRCONV_CHECK);
}
J->base[0] = tr;
}
}
/* Record unary math.* functions, mapped to IR_FPMATH opcode. */