Author: kib Date: Fri Oct 2 13:25:59 2015 New Revision: 288492 URL: https://svnweb.freebsd.org/changeset/base/288492
Log: Do not set 'flush to zero' VFPSCR_FZ bit by default. The correct implementation of IEEE 754 arithmetic depends on denormals operating correctly. Both perl test suite and paranoia tripped over the setting. Reported by: Stefan Parvu <[email protected]> Discussed with: andrew Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/arm/arm/machdep.c head/sys/arm/arm/vm_machdep.c Modified: head/sys/arm/arm/machdep.c ============================================================================== --- head/sys/arm/arm/machdep.c Fri Oct 2 13:21:08 2015 (r288491) +++ head/sys/arm/arm/machdep.c Fri Oct 2 13:25:59 2015 (r288492) @@ -1069,7 +1069,7 @@ init_proc0(vm_offset_t kstack) (thread0.td_kstack + kstack_pages * PAGE_SIZE) - 1; thread0.td_pcb->pcb_flags = 0; thread0.td_pcb->pcb_vfpcpu = -1; - thread0.td_pcb->pcb_vfpstate.fpscr = VFPSCR_DN | VFPSCR_FZ; + thread0.td_pcb->pcb_vfpstate.fpscr = VFPSCR_DN; thread0.td_frame = &proc0_tf; pcpup->pc_curpcb = thread0.td_pcb; } Modified: head/sys/arm/arm/vm_machdep.c ============================================================================== --- head/sys/arm/arm/vm_machdep.c Fri Oct 2 13:21:08 2015 (r288491) +++ head/sys/arm/arm/vm_machdep.c Fri Oct 2 13:25:59 2015 (r288492) @@ -134,7 +134,7 @@ cpu_fork(register struct thread *td1, re pcb2->pcb_regs.sf_sp = STACKALIGN(td2->td_frame); pcb2->pcb_vfpcpu = -1; - pcb2->pcb_vfpstate.fpscr = VFPSCR_DN | VFPSCR_FZ; + pcb2->pcb_vfpstate.fpscr = VFPSCR_DN; tf = td2->td_frame; tf->tf_spsr &= ~PSR_C; _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
