[Bug 55007] New: Multiple applications fail to run if Wine is compiled with CFLAGS="O2" (PlayOnline Viewer, Steam).

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55007

Bug ID: 55007
           Summary: Multiple applications fail to run if Wine is compiled
                    with CFLAGS="O2" (PlayOnline Viewer, Steam).
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msvcrt
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

If Wine is compiled with CFLAGS="-O2" after 62173699c38 [1], PlayOnline Viewer
(used to launch Final Fantasy XI Online) crashes right when the main window
should appear with:

nhandled exception: page fault on read access to 0xffffffff in 32-bit code
(0x69ec3194).

at

Backtrace:
=>0 0x69ec3194 in ddraw (+0x3194) (0x0069e334)
  1 0x00417b0a in pol (+0x17b0a) (0x0069e668)
  2 0x00417dcb in pol (+0x17dcb) (0x0069e7bc)
  3 0x00000001 (0x00000000)
0x69ec3194 ddraw+0x3194: vmovdqa %xmm0, -0x318(%ebp)

This does /not/ happen when building with -O1 for example.

This seems to also affect at least Steam (did not have time to test anything
else so far):

=>0 0x6d489493 in secur32 (+0x9493) (0x0058e094)
  1 0x6d48a58f in secur32 (+0xa58f) (0x0058e0f4)
  2 0x6d49140a in secur32 (+0x1140a) (0x0058e154)
  3 0x6c13491f in wininet (+0x3491f) (0x0058e3b4)
  4 0x6c136058 in wininet (+0x36058) (0x0058e3d4)
  5 0x6c121494 in wininet (+0x21494) (0x0058f464)
  6 0x6c125206 in wininet (+0x25206) (0x0058f4b4)
  7 0x00404490 in steamerrorreporter (+0x4490) (0x6c128360)
  8 0x8b24ec83 (0x53e58955)
0x6d489493 secur32+0x9493: vmovdqa %xmm0, -0x38(%ebp)

1.
https://source.winehq.org/git/wine.git/commit/62173699c38453777c7d5638ed2e77...