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+'mtfsf' instruction can clear FI incorrectly
+
+Using mtfsf instruction can clear the FPSCR FI bit incorrectly.  This code snippet exhibits the issue:
+--
+  fpscr.ll = 0x1fffffff;
+  __builtin_mtfsf (0b11111111, fpscr.d);
+  fpscr.d = __builtin_mffs ();
+--
+
+On POWER9 hardware:
+mffs    : FPSCR = 0x000000007ffff7ff
+
+On qemu (git master; "-cpu POWER9"):
+--
+$ ./mtfsf
+mffs    : FPSCR = 0x000000007ffdffff
+--
+
+Two differences:
+bit 52: "reserved", so maybe a "don't care" case
+bit 46: "FI"
+
+$ git log -1 master
+commit 89ea03a7dc83ca36b670ba7f787802791fcb04b1
+Merge: 019217c 2531164
+Author: Peter Maydell <email address hidden>
+Date:   Mon Sep 9 09:48:34 2019 +0100
+
+I tracked the clear is coming from do_float_check_status, likely the one in gen_mtfsf, but then I get lost figuring out what _should_ be happening. :-/
+
+Test attached.
+
+
+
+The QEMU project is currently considering to move its bug tracking to
+another system. For this we need to know which bugs are still valid
+and which could be closed already. Thus we are setting older bugs to
+"Incomplete" now.
+
+If you still think this bug report here is valid, then please switch
+the state back to "New" within the next 60 days, otherwise this report
+will be marked as "Expired". Or please mark it as "Fix Released" if
+the problem has been solved with a newer version of QEMU already.
+
+Thank you and sorry for the inconvenience.
+
+
+
+This is an automated cleanup. This bug report has been moved to QEMU's
+new bug tracker on gitlab.com and thus gets marked as 'expired' now.
+Please continue with the discussion here:
+
+ https://gitlab.com/qemu-project/qemu/-/issues/266
+
+