diff options
| author | Mark Kettenis <kettenis@cvs.openbsd.org> | 2013-06-11 18:13:39 +0000 |
|---|---|---|
| committer | Mark Kettenis <kettenis@cvs.openbsd.org> | 2013-06-11 18:13:39 +0000 |
| commit | 054b6110aa053cb779cfb42731aa959e581f1eca (patch) | |
| tree | 91ea1879708adad7663d71b6e2cee2baf31fc408 /sys/lib/libkern | |
| parent | fd64effcde8f3a8d6f04f8a84a5f2e86f03b20f8 (diff) | |
Optimize memcpy(9) by always doing a forward copy; it should never be used
for overlapping copies. Attempt to be instruction cache friendly by turning
things around and make memcpy(9) use the forward copy branch of memmove(9),
and implement bcopy(9) by swapping its arguments and dropping into memmove(9).
ok deraadt@
Diffstat (limited to 'sys/lib/libkern')
| -rw-r--r-- | sys/lib/libkern/arch/hppa/bcopy.m4 | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/sys/lib/libkern/arch/hppa/bcopy.m4 b/sys/lib/libkern/arch/hppa/bcopy.m4 index 6eeeec0b326..c40df123d0b 100644 --- a/sys/lib/libkern/arch/hppa/bcopy.m4 +++ b/sys/lib/libkern/arch/hppa/bcopy.m4 @@ -1,4 +1,4 @@ -define(_rcsid,``$OpenBSD: bcopy.m4,v 1.19 2011/11/27 12:56:18 kettenis Exp $'')dnl +define(_rcsid,``$OpenBSD: bcopy.m4,v 1.20 2013/06/11 18:13:38 kettenis Exp $'')dnl dnl dnl dnl This is the source file for bcopy.S, spcopy.S @@ -194,22 +194,22 @@ L($1, done) ' ifelse(NAME, `bcopy', ` -LEAF_ENTRY(memcpy) -ALTENTRY(memmove) +LEAF_ENTRY(bcopy) +ALTENTRY(ovbcopy) copy arg0, ret0 copy arg1, arg0 copy ret0, arg1 -ALTENTRY(ovbcopy) -ALTENTRY(bcopy) - comb,>,n arg1, arg0, L(bcopy, reverse) - hppa_copy(bcopy_f, sr0, arg0, sr0, arg1, arg2, `+') +ALTENTRY(memmove) + comb,>,n arg0, arg1, L(bcopy, reverse) +ALTENTRY(memcpy) + hppa_copy(bcopy_f, sr0, arg1, sr0, arg0, arg2, `+') bv 0(rp) nop L(bcopy, reverse) - hppa_copy(bcopy_r, sr0, arg0, sr0, arg1, arg2, `-') + hppa_copy(bcopy_r, sr0, arg1, sr0, arg0, arg2, `-') bv 0(rp) nop -EXIT(memcpy) +EXIT(bcopy) ')dnl dnl ifelse(NAME, `spcopy', |