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tcg/s390x: Avoid the constant pool in tcg_out_movi 

Load constants in no more than two insns, which turns
out to be faster than using the constant pool.

Suggested-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-12-08 23:05:03 +00:00
parent 1818c71ba1
commit 90497e03ca
1 changed files with 17 additions and 6 deletions
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23
tcg/s390x/tcg-target.c.inc
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@ -877,6 +877,9 @@ static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg dst, TCGReg src)
static const S390Opcode li_insns[4] = {
RI_LLILL, RI_LLILH, RI_LLIHL, RI_LLIHH
};
static const S390Opcode oi_insns[4] = {
RI_OILL, RI_OILH, RI_OIHL, RI_OIHH
};
static const S390Opcode lif_insns[2] = {
RIL_LLILF, RIL_LLIHF,
};
@ -928,9 +931,20 @@ static void tcg_out_movi(TCGContext *s, TCGType type,
return;
}
/* Otherwise, stuff it in the constant pool. */
tcg_out_insn(s, RIL, LGRL, ret, 0);
new_pool_label(s, sval, R_390_PC32DBL, s->code_ptr - 2, 2);
/* Otherwise, load it by parts. */
i = is_const_p16((uint32_t)uval);
if (i >= 0) {
tcg_out_insn_RI(s, li_insns[i], ret, uval >> (i * 16));
} else {
tcg_out_insn(s, RIL, LLILF, ret, uval);
}
uval >>= 32;
i = is_const_p16(uval);
if (i >= 0) {
tcg_out_insn_RI(s, oi_insns[i + 2], ret, uval >> (i * 16));
} else {
tcg_out_insn(s, RIL, OIHF, ret, uval);
}
}
/* Emit a load/store type instruction. Inputs are:
@ -1160,9 +1174,6 @@ static void tgen_andi(TCGContext *s, TCGType type, TCGReg dest, uint64_t val)
static void tgen_ori(TCGContext *s, TCGReg dest, uint64_t val)
{
static const S390Opcode oi_insns[4] = {
RI_OILL, RI_OILH, RI_OIHL, RI_OIHH
};
static const S390Opcode oif_insns[2] = {
RIL_OILF, RIL_OIHF
};