haraldwolff/qemu-patch-raspberry4
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tcg-i386: Eliminate extra move from qemu_ld64.

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If the address register overlaps one of the output registers
simply issue the clobbering load last, rather than emitting
an extra move of the address register.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2010-04-14 08:06:00 -07:00 committed by Aurelien Jarno
parent af2660894f
commit a042ef9470
1 changed files with 9 additions and 11 deletions
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20
tcg/i386/tcg-target.c
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@ -744,22 +744,20 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
}
break;
case 3:
/* XXX: could be nicer */
if (r0 == data_reg) {
r1 = TCG_REG_EDX;
if (r1 == data_reg)
r1 = TCG_REG_EAX;
tcg_out_mov(s, r1, r0);
r0 = r1;
if (bswap) {
int t = data_reg;
data_reg = data_reg2;
data_reg2 = t;
}
if (!bswap) {
if (r0 != data_reg) {
tcg_out_ld(s, TCG_TYPE_I32, data_reg, r0, GUEST_BASE);
tcg_out_ld(s, TCG_TYPE_I32, data_reg2, r0, GUEST_BASE + 4);
} else {
tcg_out_ld(s, TCG_TYPE_I32, data_reg, r0, GUEST_BASE + 4);
tcg_out_ld(s, TCG_TYPE_I32, data_reg2, r0, GUEST_BASE + 4);
tcg_out_ld(s, TCG_TYPE_I32, data_reg, r0, GUEST_BASE);
}
if (bswap) {
tcg_out_bswap32(s, data_reg);
tcg_out_ld(s, TCG_TYPE_I32, data_reg2, r0, GUEST_BASE);
tcg_out_bswap32(s, data_reg2);
}
break;