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Aurelien Jarno 29f3ff8d6c tcg/optimize: fix constant signedness 
By convention, on a 64-bit host TCG internally stores 32-bit constants
as sign-extended. This is not the case in the optimizer when a 32-bit
constant is folded.

This doesn't seem to have more consequences than suboptimal code
generation. For instance the x86 backend assumes sign-extended constants,
and in some rare cases uses a 32-bit unsigned immediate 0xffffffff
instead of a 8-bit signed immediate 0xff for the constant -1. This is
with a ppc guest:

before
------

 ---- 0x9f29cc
 movi_i32 tmp1,$0xffffffff
 movi_i32 tmp2,$0x0
 add2_i32 tmp0,CA,CA,tmp2,r6,tmp2
 add2_i32 tmp0,CA,tmp0,CA,tmp1,tmp2
 mov_i32 r10,tmp0

0x7fd8c7dfe90c:  xor    %ebp,%ebp
0x7fd8c7dfe90e:  mov    %ebp,%r11d
0x7fd8c7dfe911:  mov    0x18(%r14),%r9d
0x7fd8c7dfe915:  add    %r9d,%r10d
0x7fd8c7dfe918:  adc    %ebp,%r11d
0x7fd8c7dfe91b:  add    $0xffffffff,%r10d
0x7fd8c7dfe922:  adc    %ebp,%r11d
0x7fd8c7dfe925:  mov    %r11d,0x134(%r14)
0x7fd8c7dfe92c:  mov    %r10d,0x28(%r14)

after
-----

 ---- 0x9f29cc
 movi_i32 tmp1,$0xffffffffffffffff
 movi_i32 tmp2,$0x0
 add2_i32 tmp0,CA,CA,tmp2,r6,tmp2
 add2_i32 tmp0,CA,tmp0,CA,tmp1,tmp2
 mov_i32 r10,tmp0

0x7f37010d490c:  xor    %ebp,%ebp
0x7f37010d490e:  mov    %ebp,%r11d
0x7f37010d4911:  mov    0x18(%r14),%r9d
0x7f37010d4915:  add    %r9d,%r10d
0x7f37010d4918:  adc    %ebp,%r11d
0x7f37010d491b:  add    $0xffffffffffffffff,%r10d
0x7f37010d491f:  adc    %ebp,%r11d
0x7f37010d4922:  mov    %r11d,0x134(%r14)
0x7f37010d4929:  mov    %r10d,0x28(%r14)

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Message-Id: <1436544211-2769-2-git-send-email-aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
 		2015-08-24 11:10:08 -07:00
audio ossaudio: fix memory leak 2015-07-08 13:11:01 +02:00
backends hostmem: Fix qemu_opt_get_bool() crash in host_memory_backend_init() 2015-07-22 15:09:25 -03:00
block mirror: Fix coroutine reentrance 2015-08-14 09:51:31 -04:00
bsd-user bsd-user: Fix operand to cpu_x86_exec 2015-07-30 12:38:49 +01:00
crypto crypto: fix built-in AES decrypt function 2015-07-27 12:22:01 +02:00
default-configs smbios: move smbios code into a common folder 2015-08-13 14:08:30 +03:00
disas disas/arm-a64: Add missing compiler attribute GCC_FMT_ATTR 2015-07-21 11:18:45 +01:00
docs AioContext: optimize clearing the EventNotifier 2015-07-22 12:41:40 +01:00
dtc@65cc4d2748 dtc: Update dtc / libfdt submodule to version 1.4.0 2015-06-03 23:56:49 +02:00
fpu target-s390x: define default NaN values 2015-06-05 01:37:58 +02:00
fsdev virtfs-proxy-helper: fail gracefully if socket path is too long 2015-06-16 20:32:29 +05:30
gdb-xml gdb-xml: Include XML for s390 vector registers 2015-05-27 17:52:03 +02:00
hw * SCSI fixes from Stefan and Fam 2015-08-18 17:06:41 +01:00
include apic_internal.h: Include cpu.h directly 2015-08-19 16:29:53 +01:00
libcacard libcacard: pkgconfig: tidy dependent libs 2015-06-23 19:57:28 +03:00
libdecnumber remove libdecnumber/dpd/decimal128Local.h 2015-06-23 19:57:27 +03:00
linux-headers linux-headers: Update to 4.2-rc1 2015-07-06 17:59:01 +02:00
linux-user linux-user: Fix MIPS N64 trap and break instruction bug 2015-07-15 14:07:25 +01:00
migration migration: Fix global state with Xen. 2015-08-03 16:13:23 +00:00
net net: Flush queued packets when guest resumes 2015-07-20 18:11:24 +01:00
pc-bios pseries: Update SLOF firmware image to qemu-slof-20150429 2015-07-07 17:44:49 +02:00
pixman@87eea99e44 pixman: update internal copy to pixman-0.32.6 2014-09-15 08:14:19 +02:00
po po: fix conflict with %.mo rule in rules.mak 2014-09-26 13:35:08 +02:00
qapi qapi/qmp-event.c: Don't manually include os-win32.h/os-posix.h 2015-08-19 16:29:53 +01:00
qga qga: fixed versions for guest bus types in qapi-schema 2015-07-21 14:36:06 -05:00
qobject Include qapi/qmp/qerror.h exactly where needed 2015-06-22 18:20:41 +02:00
qom exec: drop cpu_can_do_io, just read cpu->can_do_io 2015-08-14 23:40:32 +02:00
roms pseries: Update SLOF firmware image to qemu-slof-20150429 2015-07-07 17:44:49 +02:00
scripts virtio-input: move sys/ioctl.h include 2015-07-16 17:34:41 +02:00
slirp qerror: Move #include out of qerror.h 2015-06-22 18:20:40 +02:00
stubs main-loop: introduce qemu_mutex_iothread_locked 2015-07-01 15:45:50 +02:00
target-alpha target-alpha: Inline hw_ret 2015-08-18 11:08:59 -07:00
target-arm target-arm: Add AArch32 banked register access to secure physical timer 2015-08-13 11:26:22 +01:00
target-cris disas: cris: QOMify target specific disas setup 2015-07-09 15:20:41 +02:00
target-i386 target-i386: Remove x86_cpu_compat_set_features() 2015-08-13 14:08:25 +03:00
target-lm32 cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-m68k cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-microblaze disas: microblaze: QOMify target specific disas setup 2015-07-09 15:20:41 +02:00
target-mips target-mips: Use CPU_LOG_INT for logging related to interrupts 2015-08-13 16:22:53 +01:00
target-moxie cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-openrisc cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-ppc cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-s390x cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-sh4 cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-sparc cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-tricore cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-unicore32 cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
target-xtensa cpu-exec: Purge all uses of ENV_GET_CPU() 2015-07-09 15:20:40 +02:00
tcg tcg/optimize: fix constant signedness 2015-08-24 11:10:08 -07:00
tests * SCSI fixes from Stefan and Fam 2015-08-18 17:06:41 +01:00
trace Remove superfluous '\n' around error_report() 2015-03-10 08:15:33 +03:00
ui vnc: fix memory leak 2015-07-24 13:57:44 +02:00
util * SCSI fixes from Stefan and Fam 2015-08-18 17:06:41 +01:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore gitignore: Ignore shader generated files 2015-07-27 22:44:47 +03:00
.gitmodules PPC: Add u-boot firmware for e500 2014-06-16 13:24:35 +02:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.travis.yml .travis.yml: Add "--enable-modules" 2015-01-26 12:27:05 +01:00
CODING_STYLE CODING_STYLE: Section about conditional statement 2014-08-15 18:54:06 +04:00
COPYING
…
COPYING.LIB
…
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
LICENSE vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into include/hw/vfio 2014-12-19 15:24:06 -07:00
MAINTAINERS MAINTAINERS: list smbios maintainers 2015-08-13 14:08:31 +03:00
Makefile make: Clean build messages 2015-07-27 22:44:47 +03:00
Makefile.objs crypto: introduce new module for computing hash digests 2015-07-07 12:04:07 +02:00
Makefile.target migration: move savevm.c inside migration/ 2015-06-12 06:42:30 +02:00
README Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
VERSION Open 2.5 development tree 2015-08-11 23:15:55 +01:00
accel.c accel: Create accel object when initializing machine 2014-10-09 15:36:14 +02:00
aio-posix.c AioContext: optimize clearing the EventNotifier 2015-07-22 12:41:40 +01:00
aio-win32.c AioContext: optimize clearing the EventNotifier 2015-07-22 12:41:40 +01:00
arch_init.c smbios: move smbios code into a common folder 2015-08-13 14:08:30 +03:00
async.c AioContext: force event loop iteration using BH 2015-07-29 10:02:06 +01:00
balloon.c Include monitor/monitor.h exactly where needed 2015-06-22 18:20:41 +02:00
block.c block: Fix backing file child when modifying graph 2015-07-14 17:15:23 +02:00
blockdev-nbd.c Include monitor/monitor.h exactly where needed 2015-06-22 18:20:41 +02:00
blockdev.c throttle: refuse bps_max/iops_max without bps/iops 2015-08-05 12:53:48 +01:00
blockjob.c blockjob: add block_job_release function 2015-07-07 14:27:14 +01:00
bootdevice.c misc: fix typos in copyright declaration 2015-03-26 14:21:43 +01:00
bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
configure configure: Don't permit SDL or GTK on OSX 2015-08-19 20:29:30 +01:00
coroutine-gthread.c glib-compat.h: add new thread API emulation on top of pre-2.31 API 2014-06-10 07:44:01 +02:00
coroutine-sigaltstack.c coroutine-sigaltstack: Change jmp_buf to sigjmp_buf 2014-11-11 11:07:55 +03:00
coroutine-ucontext.c coroutine-ucontext: use __thread 2015-01-13 13:43:28 +00:00
coroutine-win32.c coroutine-win32.c: Add noinline attribute to work around gcc bug 2014-06-26 14:08:14 +01:00
cpu-exec.c exec: drop cpu_can_do_io, just read cpu->can_do_io 2015-08-14 23:40:32 +02:00
cpus.c exec: drop cpu_can_do_io, just read cpu->can_do_io 2015-08-14 23:40:32 +02:00
cputlb.c memory: replace cpu_physical_memory_reset_dirty() with test-and-clear 2015-06-05 17:10:00 +02:00
device-hotplug.c pci-hotplug-old: Has been dead for five major releases, bury 2015-03-01 12:37:54 +01:00
device_tree.c device_tree: Fix a typo 2015-07-27 22:44:47 +03:00
disas.c disas: Defeature print_target_address 2015-08-14 23:40:32 +02:00
dma-helpers.c range: remove useless inclusions 2015-04-30 16:05:48 +03:00
dump.c Include qapi/qmp/qerror.h exactly where needed 2015-06-22 18:20:41 +02:00
exec.c exec: use macro ROUND_UP for alignment 2015-08-14 23:40:32 +02:00
gdbstub.c gdbstub: Set current CPU on interruptions 2015-07-27 22:46:16 +03:00
hmp-commands.hx qmp/hmp: add rocker device support 2015-06-12 13:42:17 +01:00
hmp.c qmp: Add optional bool "unmap" to drive-mirror 2015-07-02 10:06:23 +01:00
hmp.h qmp/hmp: add rocker device support 2015-06-12 13:42:17 +01:00
iohandler.c iohandler: Change return type of qemu_set_fd_handler to "void" 2015-06-12 13:26:21 +01:00
ioport.c - miscellaneous cleanups for TCG (Emilio) and NBD (Bogdan) 2015-04-30 12:04:11 +01:00
iothread.c rcu: actually register threads that have RCU read-side critical sections 2015-07-24 13:57:45 +02:00
kvm-all.c VFIO updates for 2.4-rc0 2015-07-07 09:22:40 +01:00
kvm-stub.c kvm: some fixes to kvm_resamplefds_allowed 2015-07-06 12:15:14 -06:00
main-loop.c main-loop: fix qemu_notify_event for aio_notify optimization 2015-07-27 17:12:19 +01:00
memory.c Merge memory_region_init_reservation() into memory_region_init_io() 2015-08-13 11:26:21 +01:00
memory_mapping.c memory_mapping: Rework cpu related includes 2015-06-26 16:00:50 +02:00
module-common.c module: implement module loading 2014-02-20 13:14:18 +01:00
monitor.c osdep.h: Remove qemu_printf 2015-08-19 16:29:53 +01:00
nbd.c qemu-nbd: only send a limited number of errno codes on the wire 2015-05-08 14:45:11 +02:00
numa.c numa: Fix memory leak in numa_set_mem_node_id() 2015-07-15 16:57:50 -03:00
os-posix.c rcu: do not create thread in pthread_atfork callback 2015-04-01 10:06:38 +02:00
os-win32.c pidfile: stop making pidfile error a special case 2014-11-02 10:04:34 +03:00
page_cache.c xbzrle: rebuild the cache_is_cached function 2015-01-15 17:49:43 +05:30
qapi-schema.json qapi: add missing @ 2015-07-27 22:44:47 +03:00
qdev-monitor.c Include qapi/qmp/qerror.h exactly where needed 2015-06-22 18:20:41 +02:00
qdict-test-data.txt
…
qemu-bridge-helper.c qemu-bridge-helper: Fix fd leak in main() 2014-06-27 10:39:10 +02:00
qemu-char.c qemu-char: Fix missed data on unix socket 2015-07-23 07:37:38 +02:00
qemu-coroutine-io.c coroutine-io: Return -errno in case of error 2015-03-18 12:07:21 +01:00
qemu-coroutine-lock.c coroutine: remove unnecessary parentheses in qemu_co_queue_empty 2015-04-30 16:05:49 +03:00
qemu-coroutine-sleep.c coroutine: Drop co_sleep_ns 2014-08-29 10:46:58 +01:00
qemu-coroutine.c coroutine: Clean up qemu_coroutine_enter() 2015-03-09 11:11:59 +01:00
qemu-doc.texi qemu-doc: fix typos 2015-07-24 13:57:45 +02:00
qemu-img-cmds.hx qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-img.c Include qapi/qmp/qerror.h exactly where needed 2015-06-22 18:20:41 +02:00
qemu-img.texi qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-io-cmds.c qerror: Move #include out of qerror.h 2015-06-22 18:20:40 +02:00
qemu-io.c qerror: Move #include out of qerror.h 2015-06-22 18:20:40 +02:00
qemu-log.c qemu-log: Correct help text of 'log cpu_reset' 2015-02-10 09:27:20 +03:00
qemu-nbd.c qemu-nbd: remove unnecessary qemu_notify_event() 2015-08-14 23:40:32 +02:00
qemu-nbd.texi nbd: Miscellaneous typo fixes. 2014-05-24 00:07:29 +04:00
qemu-options-wrapper.h vl.c: In qemu -h output, only print options for the arch we are running as 2011-12-19 10:27:33 -06:00
qemu-options.h vl.c: Move option generation logic into a wrapper file 2011-12-19 10:27:33 -06:00
qemu-options.hx qemu-doc: fix typos 2015-07-24 13:57:45 +02:00
qemu-seccomp.c seccomp: add mlockall to whitelist 2015-01-23 14:07:08 +01:00
qemu-tech.texi qemu-doc: fix typos 2015-07-24 13:57:45 +02:00
qemu-timer.c qemu-timer: initialize "timers_done_ev" to set 2015-07-22 12:41:32 +01:00
qemu.nsi nsis: Improved support for parallel installation of 32 and 64 bit code 2013-11-07 07:02:44 +01:00
qemu.sasl sasl: Avoid 'Could not find keytab file' in syslog 2014-03-15 13:54:18 +04:00
qjson.c QJSON: Use OBJECT_CHECK 2015-05-11 08:59:07 -04:00
qmp-commands.hx migration: Write documetation for events capabilites 2015-07-15 09:07:54 +02:00
qmp.c Include monitor/monitor.h exactly where needed 2015-06-22 18:20:41 +02:00
qtest.c qtest: pre-buffer hex nibs 2015-05-22 15:58:22 -04:00
rules.mak make: load only required dependency files. 2015-08-13 14:08:25 +03:00
softmmu_template.h exec: drop cpu_can_do_io, just read cpu->can_do_io 2015-08-14 23:40:32 +02:00
spice-qemu-char.c spice: fix spice_chr_add_watch() pre-condition 2015-05-29 09:56:01 +02:00
tcg-runtime.c tcg: Push tcg-runtime routines into exec/helper-* 2014-05-28 09:33:54 -07:00
tci.c tcg: Mask TCGMemOp appropriately for indexing 2015-06-09 06:35:29 -07:00
thread-pool.c thread-pool: clean up thread_pool_completion_bh() 2015-04-28 15:36:09 +02:00
thunk.c linux-user: Allocate thunk size dynamically 2015-06-15 11:36:58 +03:00
tpm.c Include monitor/monitor.h exactly where needed 2015-06-22 18:20:41 +02:00
trace-events block/mirror: limit qiov to IOV_MAX elements 2015-08-06 04:41:09 -04:00
translate-all.c exec: drop cpu_can_do_io, just read cpu->can_do_io 2015-08-14 23:40:32 +02:00
translate-all.h translate-all: remove unnecessary argument to tb_invalidate_phys_range 2015-06-05 17:09:59 +02:00
user-exec.c osdep.h: Remove qemu_printf 2015-08-19 16:29:53 +01:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c smbios: move smbios code into a common folder 2015-08-13 14:08:30 +03:00
xen-common-stub.c accel: Move Xen registration code to xen-common.c 2014-10-04 08:59:15 +02:00
xen-common.c migration: Fix regression for xenfv and pc,accel=xen machine. 2015-08-03 16:13:40 +00:00
xen-hvm-stub.c xen: Remove xen_cmos_set_s3_resume() 2015-03-10 08:15:33 +03:00
xen-hvm.c xen-220615, more SOB lines 2015-06-23 17:46:20 +01:00
xen-mapcache.c xen: add a lock for the mapcache 2015-01-20 14:24:17 +00:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org

- QEMU team