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3764a82377
freebsd-dev/sys/i386/include
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Bruce Evans 3764a82377 Simplified PCPU_GET() and PCPU_SET(). We must copy through a temporary 
variable to avoid invalid constraints in dead code.  Use an array of
u_char's (inside a struct) instead of a char/short/int/long variable so
that the variable and its accesses can be spelled in the same way in all
cases and code doesn't need to be cloned just to hold the spelling
differences.

Fixed strict-aliasing errors in PCPU_SET() and in the amd64 PCPU_GET().
Cast to (void *) as in rev.1.37 of the i386 version where the errors
were fixed for the i386 PCPU_GET() only.  It would be more correct to
copy to and from the temp. variable using memcpy(), but then an
ifdef tangle would be required to ensure using the builtin memcpy().
We depend on fairly aggressive optimization to put the temp. variable
only in a register despite it being copied using
*(type *)(void *)&anothertype and could depend on this when using
memcpy() too.  This seems to work right even for -O0, but the -O0 case
has not been completely tested.

This change gives identical object code for all object files in LINT
on amd64 (except for one file with a __TIME__ stamp).  For LINT on
i386 it gives unimportant differences in instruction order and padding
in a few object files.  This was only tested for -O.

This change (actually a previous version of it) gives the following
reductions in the number of object files in LINT that fail to compile
with -O2 but without the -fno-strict-aliasing kludge:
- amd64: 29 (down from 211)
- i386: 36 (down from 47)

gcc-3.4.6 actually allows the invalid constraints that result from not
using the temp. variable, at least with -O[1-2], but gcc-3.3.3 crashes
on them and I don't want to depend on compiler bugs.
2007-02-06 16:21:09 +00:00
..
pc Make the facility for recognizing BIOS-signatures more general 2005-07-21 09:48:37 +00:00
_bus.h Break out the definition of bus_space_{tag,handle}_t and a few other types 2005-04-18 21:45:34 +00:00
_inttypes.h
_limits.h Move MINSIGSTKSZ from <machine/signal.h> to <machine/_limits.h> and rename 2005-08-20 16:44:41 +00:00
_stdint.h <stdint.h> should define WINT_M{AX,IN} independent from whether WCHAR_MIN is 2004-05-18 16:04:57 +00:00
_types.h By popular demand, move __HAVE_ACPI and __PCI_REROUTE_INTERRUPT into 2006-01-09 06:05:57 +00:00
acpica_machdep.h Move the code for halting the CPU (acpi_cpu_c1) into machdep files. 2004-10-11 05:39:15 +00:00
apicreg.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
apicvar.h Evidently FreeBSD has long relied on the compiler to treat structures 2006-12-17 05:07:01 +00:00
apm_bios.h Move pc98 specific parts to the pc98 specific file. 2005-04-03 23:27:11 +00:00
apm_segments.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
asm.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
asmacros.h Removed all traces of HIDENAME() in amd64 and i386 kernel code. Using 2006-10-28 06:04:29 +00:00
atomic.h Fix oops in previous commit. 2006-12-29 15:48:18 +00:00
bootinfo.h
bus_dma.h Refactor the bus_dma header files so that the interface is described in 2005-03-14 16:46:28 +00:00
bus.h Fix -Wundef warnings found when compiling i386 LINT, GENERIC and 2005-12-05 11:58:35 +00:00
clock.h Cleaned up declaration and initialization of clock_lock. It is only 2007-01-23 08:01:20 +00:00
cpu.h Clean out sysctl machdep.* related defines. 2006-05-11 17:29:25 +00:00
cpufunc.h Add a knob for disabling/enabling HTT, "machdep.hyperthreading_allowed". 2005-05-13 00:10:56 +00:00
cputypes.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
cserial.h Prepare for sconfig(8) update. 2006-01-30 13:34:57 +00:00
db_machdep.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
elan_mmcr.h Expand indirect reference to BSD license with the current one. 2005-01-06 22:05:28 +00:00
elf.h PR: 2006-10-04 21:37:10 +00:00
endian.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
exec.h Use a common multi-inclusion protection, and add such a 2005-02-19 21:16:48 +00:00
float.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
floatingpoint.h The file machine/ieeefp.h needs sys/cdefs.h on amd64 and i386 after my 2005-04-02 17:31:42 +00:00
frame.h Tweak how the MD code calls the fooclock() methods some. Instead of 2005-12-22 22:16:09 +00:00
gdb_machdep.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_cause.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_debug.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_ioctl.h Extend i4b to support CAPI manager based ISDN controllers (CAPI manager is part of 2006-07-09 21:16:06 +00:00
i4b_rbch_ioctl.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_tel_ioctl.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
i4b_trace.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
ieeefp.h Remove fpsetsticky(). This was added for SysV compatibility, but due 2005-03-15 15:53:39 +00:00
if_wl_wavelan.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
in_cksum.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
intr_machdep.h Expand the MSI/MSI-X API to address some deficiencies in the MSI-X support. 2007-01-22 21:48:44 +00:00
ioctl_bt848.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
ioctl_meteor.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
iodev.h Break out the MI part of the /dev/[k]mem and /dev/io drivers into 2004-08-01 11:40:54 +00:00
kdb.h Eliminate HAVE_STOPPEDPCBS. On ia64 the PCPU holds a pointer to the 2006-04-03 22:51:47 +00:00
legacyvar.h Expose legacy_pcib_alloc_resource, and use it in the mptable pci bus 2005-09-17 23:57:53 +00:00
limits.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
md_var.h Initialise (if necessary) the VIA C3/C7 features. 2006-07-12 19:46:08 +00:00
memdev.h Break out the MI part of the /dev/[k]mem and /dev/io drivers into 2004-08-01 11:40:54 +00:00
metadata.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
minidump.h Merge minidumps from amd64 where they were originally developed. 2006-04-21 04:28:43 +00:00
mp_watchdog.h Add an "options MP_WATCHDOG" to i386. This option allows one of the 2004-08-15 18:02:09 +00:00
mptable.h guard function decls with _KERNEL so user code can include this file 2006-02-22 21:38:33 +00:00
mutex.h Move clock_lock prototype into <machine/clock.h>, where it is more 2006-05-19 18:53:50 +00:00
npx.h Use the method described in IA-32 Intel Architecture Software Developer's 2006-05-30 23:44:21 +00:00
param.h By popular demand, move __HAVE_ACPI and __PCI_REROUTE_INTERRUPT into 2006-01-09 06:05:57 +00:00
pcaudioio.h
pcb_ext.h Explicitly switch to the new TSS by updating the current CPU's TSS selector 2005-09-15 17:30:08 +00:00
pcb.h Remove pcb_switchout, it has not been used for a long time. 2005-12-29 13:23:48 +00:00
pci_cfgreg.h Move pc98 specific parts to the pc98 specific file. 2005-04-03 23:27:11 +00:00
pcpu.h Simplified PCPU_GET() and PCPU_SET(). We must copy through a temporary 2007-02-06 16:21:09 +00:00
pecoff_machdep.h
perfmon.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
pmap.h The global variable avail_end is redundant and only used once. Eliminate 2006-11-19 20:54:58 +00:00
pmc_mdep.h MFP4: 2005-06-09 19:45:09 +00:00
ppireg.h - Move timerreg.h to <arch>/include and split i8253 specific defines into 2005-05-14 09:10:02 +00:00
privatespace.h Test commit after repoman upgrade. Remove one of my many email addresses 2006-05-12 22:38:53 +00:00
proc.h Divorce critical sections from spinlocks. Critical sections as denoted by 2005-04-04 21:53:56 +00:00
profile.h i386/include/profile.h: 2006-10-28 11:03:03 +00:00
psl.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
ptrace.h Add support for XMM registers in GDB for x86 processors that support 2005-05-31 09:43:04 +00:00
reg.h - Add macro constants for the various fields in %dr7 and use them in place 2006-11-17 19:20:32 +00:00
reloc.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
resource.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
runq.h /* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00
segments.h Change the segment limits to 4GB, we set the user accessible bit on all 2005-04-13 22:57:17 +00:00
setjmp.h Remove 3rd clause, renumber, ok per email 2007-01-12 07:26:21 +00:00
sf_buf.h Implement support for CPU private mappings within sf_buf_alloc(). 2005-02-13 06:23:13 +00:00
sigframe.h
signal.h Move MINSIGSTKSZ from <machine/signal.h> to <machine/_limits.h> and rename 2005-08-20 16:44:41 +00:00
smapi.h
smp.h Add a new 'pmap_invalidate_cache()' to flush the CPU caches via the 2006-05-01 21:36:47 +00:00
speaker.h Add /dev/speaker support to amd64. 2005-11-11 09:57:32 +00:00
specialreg.h Add SSSE3 extensions and correct CNXT-ID spelling for Intel processors. 2007-01-09 19:23:22 +00:00
stdarg.h Use __builtin_va_start instead of __builtin_stdarg_start. GCC4 obsoletes 2006-09-21 01:37:02 +00:00
sysarch.h Change the segment limits to 4GB, we set the user accessible bit on all 2005-04-13 22:57:17 +00:00
timerreg.h Change the spkr_set_pitch() function to a macro to fix low level profiling. 2005-05-28 13:40:27 +00:00
trap.h Add POSIX siginfo_t's si_code, this is for upcoming POSIX realtime signal 2005-10-14 03:01:14 +00:00
tss.h Remove advertising clause from University of California Regent's 2004-04-07 20:46:16 +00:00
ucontext.h MFamd64: use register_t's. 2005-09-12 03:34:05 +00:00
varargs.h netchild's mega-patch to isolate compiler dependencies into a central 2005-03-02 21:33:29 +00:00
vm86.h
vmparam.h Increase the scaling of VM_KMEM_SIZE_MAX. 2004-08-16 08:35:22 +00:00
xbox.h Committed the xbox syscons(8)-able console driver. 2006-03-03 14:52:57 +00:00