Ubuntu
memtest86+ package

  1. Bug #1071209
  2. Comment #23

Comment 23 for bug 1071209

Revision history for this message
In , Duwe (duwe) wrote :

The bug is triggered by a different register allocation.
gcc-4.6 uses ebp for the volatile ulong *start (remember, -fomit-frame-pointer), where gcc-4.7 prefers ecx.

ECX is, AFAIK "caller-save" by the ABI calling convention; and the asm inline calls rand(), which it does not declare. Rand() is free to clobber ecx.