diff options
| author |   miod <miod@openbsd.org> | 2017-03-16 18:15:20 +0000 |
|---|---|---|
| committer | miod <miod@openbsd.org> | 2017-03-16 18:15:20 +0000 |
| commit | 0c2c99feb49a8ba7cf1b5d610af5e2966c26cfc5 (patch) | |
| tree | bd7416a5880df3706115915af097f2929e3b3cfe | |
| parent | Use a power of two and left shift, rather than integer multiplication, for (diff) | |
| download | wireguard-openbsd-0c2c99feb49a8ba7cf1b5d610af5e2966c26cfc5.tar.xz wireguard-openbsd-0c2c99feb49a8ba7cf1b5d610af5e2966c26cfc5.zip | |
Unroll two small bus_space_{read_write}_multi operations in a hot code path.
This causes a tiny speedup.
ok aoyama@
| -rw-r--r-- | sys/arch/luna88k/dev/mb89352.c | 54 |
1 files changed, 52 insertions, 2 deletions
diff --git a/sys/arch/luna88k/dev/mb89352.c b/sys/arch/luna88k/dev/mb89352.c index deba9ca1505..a68d4bc3d02 100644 --- a/sys/arch/luna88k/dev/mb89352.c +++ b/sys/arch/luna88k/dev/mb89352.c @@ -1,4 +1,4 @@ -/* $OpenBSD: mb89352.c,v 1.20 2014/10/05 11:46:18 aoyama Exp $ */ +/* $OpenBSD: mb89352.c,v 1.21 2017/03/16 18:15:20 miod Exp $ */ /* $NetBSD: mb89352.c,v 1.5 2000/03/23 07:01:31 thorpej Exp $ */ /* NecBSD: mb89352.c,v 1.4 1998/03/14 07:31:20 kmatsuda Exp */ @@ -176,6 +176,14 @@ void spc_print_active_acb(void); extern struct cfdriver spc_cd; +#define breathe() \ +do { \ + asm volatile ("or %r0, %r0, %r0"); \ + asm volatile ("or %r0, %r0, %r0"); \ + asm volatile ("or %r0, %r0, %r0"); \ + asm volatile ("or %r0, %r0, %r0"); \ +} while (0) + /* * INITIALIZATION ROUTINES (probe, attach ++) */ @@ -1369,8 +1377,29 @@ spc_dataout_pio(struct spc_softc *sc, u_char *p, int n) n -= xfer; out += xfer; +#if 0 bus_space_write_multi_1(iot, ioh, DREG, p, xfer); p += xfer; +#else + switch (xfer) { + case 8: + bus_space_write_1(iot, ioh, DREG, *p++); + case 7: + bus_space_write_1(iot, ioh, DREG, *p++); + case 6: + bus_space_write_1(iot, ioh, DREG, *p++); + case 5: + bus_space_write_1(iot, ioh, DREG, *p++); + case 4: + bus_space_write_1(iot, ioh, DREG, *p++); + case 3: + bus_space_write_1(iot, ioh, DREG, *p++); + case 2: + bus_space_write_1(iot, ioh, DREG, *p++); + case 1: + bus_space_write_1(iot, ioh, DREG, *p++); + } +#endif } if (out == 0) { @@ -1484,8 +1513,29 @@ spc_datain_pio(struct spc_softc *sc, u_char *p, int n) n -= xfer; in += xfer; +#if 0 bus_space_read_multi_1(iot, ioh, DREG, p, xfer); p += xfer; +#else + switch (xfer) { + case 8: + *p++ = bus_space_read_1(iot, ioh, DREG); + case 7: + *p++ = bus_space_read_1(iot, ioh, DREG); + case 6: + *p++ = bus_space_read_1(iot, ioh, DREG); + case 5: + *p++ = bus_space_read_1(iot, ioh, DREG); + case 4: + *p++ = bus_space_read_1(iot, ioh, DREG); + case 3: + *p++ = bus_space_read_1(iot, ioh, DREG); + case 2: + *p++ = bus_space_read_1(iot, ioh, DREG); + case 1: + *p++ = bus_space_read_1(iot, ioh, DREG); + } +#endif if (intstat != 0) goto phasechange; @@ -1801,7 +1851,7 @@ dophase: bus_space_write_1(iot, ioh, INTS, ints); ints = 0; while ((bus_space_read_1(iot, ioh, PSNS) & PSNS_REQ) == 0) - delay(1); /* need timeout XXX */ + breathe(); /* need timeout XXX */ #endif /* |