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qemu / qemu / c4d4525c38cd93cc5d1a743976eb25ac571d435f
commitc4d4525c38cd93cc5d1a743976eb25ac571d435f[log] [tgz]
authorPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>Fri Dec 05 12:11:13 2014 +0300
committerRichard Henderson <rth@twiddle.net>Sun Dec 14 16:48:38 2014 -0600
treee6c24b236447d4447bc64b1bd46f26f002764cc5
parent18b41f95d20ac6dbf918c73e704d4ca1fbc1a62f [diff]
target-i386: fix icount processing for repz instructions

TCG generates optimized code for i386 repz instructions in single step mode.
It means that when ecx becomes 0, execution of the string instruction breaks
immediately without an additional iteration for ecx==0 (which will only check
ecx and set the flags). Omitting this iteration leads to different
instructions counting in singlestep mode and in normal execution.
This patch disables optimization of this last iteration for icount mode
which should be deterministic.

v2: inverted the condition and formatted the comment

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Signed-off-by: Richard Henderson <rth@twiddle.net>
1 file changed
tree: e6c24b236447d4447bc64b1bd46f26f002764cc5
  1. audio/
  2. backends/
  3. block/
  4. bsd-user/
  5. default-configs/
  6. disas/
  7. docs/
  8. fpu/
  9. fsdev/
  10. gdb-xml/
  11. hw/
  12. include/
  13. libcacard/
  14. libdecnumber/
  15. linux-headers/
  16. linux-user/
  17. net/
  18. pc-bios/
  19. po/
  20. qapi/
  21. qga/
  22. qobject/
  23. qom/
  24. roms/
  25. scripts/
  26. slirp/
  27. stubs/
  28. sysconfigs/
  29. target-alpha/
  30. target-arm/
  31. target-cris/
  32. target-i386/
  33. target-lm32/
  34. target-m68k/
  35. target-microblaze/
  36. target-mips/
  37. target-moxie/
  38. target-openrisc/
  39. target-ppc/
  40. target-s390x/
  41. target-sh4/
  42. target-sparc/
  43. target-tricore/
  44. target-unicore32/
  45. target-xtensa/
  46. tcg/
  47. tests/
  48. trace/
  49. ui/
  50. util/
  51. dtc
  52. pixman
  53. .exrc
  54. .gitignore
  55. .gitmodules
  56. .mailmap
  57. .travis.yml
  58. accel.c
  59. aio-posix.c
  60. aio-win32.c
  61. arch_init.c
  62. async.c
  63. balloon.c
  64. block-migration.c
  65. block.c
  66. blockdev-nbd.c
  67. blockdev.c
  68. blockjob.c
  69. bootdevice.c
  70. bt-host.c
  71. bt-vhci.c
  72. Changelog
  73. CODING_STYLE
  74. configure
  75. COPYING
  76. COPYING.LIB
  77. coroutine-gthread.c
  78. coroutine-sigaltstack.c
  79. coroutine-ucontext.c
  80. coroutine-win32.c
  81. cpu-exec.c
  82. cpus.c
  83. cputlb.c
  84. device-hotplug.c
  85. device_tree.c
  86. disas.c
  87. dma-helpers.c
  88. dump.c
  89. exec.c
  90. gdbstub.c
  91. HACKING
  92. hmp-commands.hx
  93. hmp.c
  94. hmp.h
  95. iohandler.c
  96. ioport.c
  97. iothread.c
  98. kvm-all.c
  99. kvm-stub.c
  100. LICENSE
  101. main-loop.c
  102. MAINTAINERS
  103. Makefile
  104. Makefile.objs
  105. Makefile.target
  106. memory.c
  107. memory_mapping.c
  108. migration-exec.c
  109. migration-fd.c
  110. migration-rdma.c
  111. migration-tcp.c
  112. migration-unix.c
  113. migration.c
  114. module-common.c
  115. monitor.c
  116. nbd.c
  117. numa.c
  118. os-posix.c
  119. os-win32.c
  120. page_cache.c
  121. qapi-schema.json
  122. qdev-monitor.c
  123. qdict-test-data.txt
  124. qemu-bridge-helper.c
  125. qemu-char.c
  126. qemu-coroutine-io.c
  127. qemu-coroutine-lock.c
  128. qemu-coroutine-sleep.c
  129. qemu-coroutine.c
  130. qemu-doc.texi
  131. qemu-file-stdio.c
  132. qemu-file-unix.c
  133. qemu-file.c
  134. qemu-img-cmds.hx
  135. qemu-img.c
  136. qemu-img.texi
  137. qemu-io-cmds.c
  138. qemu-io.c
  139. qemu-log.c
  140. qemu-nbd.c
  141. qemu-nbd.texi
  142. qemu-options-wrapper.h
  143. qemu-options.h
  144. qemu-options.hx
  145. qemu-seccomp.c
  146. qemu-tech.texi
  147. qemu-timer.c
  148. qemu.nsi
  149. qemu.sasl
  150. qmp-commands.hx
  151. qmp.c
  152. qtest.c
  153. README
  154. rules.mak
  155. savevm.c
  156. softmmu_template.h
  157. spice-qemu-char.c
  158. tcg-runtime.c
  159. tci.c
  160. thread-pool.c
  161. thunk.c
  162. tpm.c
  163. trace-events
  164. translate-all.c
  165. translate-all.h
  166. user-exec.c
  167. VERSION
  168. version.rc
  169. vl.c
  170. vmstate.c
  171. xbzrle.c
  172. xen-common-stub.c
  173. xen-common.c
  174. xen-hvm-stub.c
  175. xen-hvm.c
  176. xen-mapcache.c