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[Qemu-commits] [qemu/qemu] 9bf383: Revert "tcg/i386: Rely on undefined/u


From: GitHub
Subject: [Qemu-commits] [qemu/qemu] 9bf383: Revert "tcg/i386: Rely on undefined/undocumented b...
Date: Thu, 19 Jan 2017 10:00:05 -0800

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: 9bf38308f603680ca9b8d9a71e954d4c8a982d0c
      
https://github.com/qemu/qemu/commit/9bf38308f603680ca9b8d9a71e954d4c8a982d0c
  Author: Richard Henderson <address@hidden>
  Date:   2017-01-17 (Tue, 17 Jan 2017)

  Changed paths:
    M tcg/i386/tcg-target.inc.c

  Log Message:
  -----------
  Revert "tcg/i386: Rely on undefined/undocumented behaviour of BSF/BSR"

This reverts commit 4ac76910734209dab83ddd3795f08fc7889ef463.

This fixes
  http://lists.nongnu.org/archive/html/qemu-devel/2017-01/msg03062.html

While I think we could get away with relying on the undocumented
behaviour, the tcg constraint system isn't powerful enough to
properly describe the required (non-)overlap conditions.

Reported-by: Eduardo Habkost <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>


  Commit: 39f099ec9d6d420b6fe6f7f4f8ed80ae29c65ff2
      
https://github.com/qemu/qemu/commit/39f099ec9d6d420b6fe6f7f4f8ed80ae29c65ff2
  Author: Richard Henderson <address@hidden>
  Date:   2017-01-17 (Tue, 17 Jan 2017)

  Changed paths:
    M tcg/i386/tcg-target.inc.c

  Log Message:
  -----------
  tcg/i386: Always use TZCNT when available

I think this is cleaner than sometimes using BSF.

Signed-off-by: Richard Henderson <address@hidden>


  Commit: 5e59fb10ce5ef4cb3431ffead9cf1dd48080a641
      
https://github.com/qemu/qemu/commit/5e59fb10ce5ef4cb3431ffead9cf1dd48080a641
  Author: Peter Maydell <address@hidden>
  Date:   2017-01-19 (Thu, 19 Jan 2017)

  Changed paths:
    M tcg/i386/tcg-target.inc.c

  Log Message:
  -----------
  Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20170117' into staging

tcg/i386 fixes

# gpg: Signature made Tue 17 Jan 2017 22:58:04 GMT
# gpg:                using RSA key 0xAD1270CC4DD0279B
# gpg: Good signature from "Richard Henderson <address@hidden>"
# gpg:                 aka "Richard Henderson <address@hidden>"
# gpg:                 aka "Richard Henderson <address@hidden>"
# Primary key fingerprint: 9CB1 8DDA F8E8 49AD 2AFC  16A4 AD12 70CC 4DD0 279B

* remotes/rth/tags/pull-tcg-20170117:
  tcg/i386: Always use TZCNT when available
  Revert "tcg/i386: Rely on undefined/undocumented behaviour of BSF/BSR"

Signed-off-by: Peter Maydell <address@hidden>


Compare: https://github.com/qemu/qemu/compare/ab4b92760498...5e59fb10ce5e

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