tcg-i386: Try pc-relative lea for constant formation
Use a 7 byte lea before the ultimate 10 byte movq. Signed-off-by: Richard Henderson <rth@twiddle.net>
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@ -541,19 +541,34 @@ static inline void tcg_out_mov(TCGContext *s, TCGType type,
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static void tcg_out_movi(TCGContext *s, TCGType type,
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TCGReg ret, tcg_target_long arg)
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{
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tcg_target_long diff;
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if (arg == 0) {
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tgen_arithr(s, ARITH_XOR, ret, ret);
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return;
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} else if (arg == (uint32_t)arg || type == TCG_TYPE_I32) {
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}
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if (arg == (uint32_t)arg || type == TCG_TYPE_I32) {
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tcg_out_opc(s, OPC_MOVL_Iv + LOWREGMASK(ret), 0, ret, 0);
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tcg_out32(s, arg);
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} else if (arg == (int32_t)arg) {
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return;
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}
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if (arg == (int32_t)arg) {
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tcg_out_modrm(s, OPC_MOVL_EvIz + P_REXW, 0, ret);
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tcg_out32(s, arg);
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} else {
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tcg_out_opc(s, OPC_MOVL_Iv + P_REXW + LOWREGMASK(ret), 0, ret, 0);
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tcg_out64(s, arg);
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return;
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}
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/* Try a 7 byte pc-relative lea before the 10 byte movq. */
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diff = arg - ((tcg_target_long)s->code_ptr + 7);
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if (diff == (int32_t)diff) {
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tcg_out_opc(s, OPC_LEA | P_REXW, ret, 0, 0);
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tcg_out8(s, (LOWREGMASK(ret) << 3) | 5);
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tcg_out32(s, diff);
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return;
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}
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tcg_out_opc(s, OPC_MOVL_Iv + P_REXW + LOWREGMASK(ret), 0, ret, 0);
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tcg_out64(s, arg);
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}
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static inline void tcg_out_pushi(TCGContext *s, tcg_target_long val)
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