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 ** Changed in: qemu Status: New => Expired ** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #266 https://gitlab.com/qemu-project/qemu/-/issues/266 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1843795 Title: 'mtfsf' instruction can clear FI incorrectly Status in QEMU: Expired Bug description: 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 <peter.mayd...@linaro.org> 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. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1843795/+subscriptions
