From 7ecbae3523958a1c207a3d1e883a18c14a531f02 Mon Sep 17 00:00:00 2001 From: Konstantin Belousov Date: Fri, 2 Oct 2015 13:25:59 +0000 Subject: [PATCH] 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 Discussed with: andrew Sponsored by: The FreeBSD Foundation MFC after: 1 week --- sys/arm/arm/machdep.c | 2 +- sys/arm/arm/vm_machdep.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/sys/arm/arm/machdep.c b/sys/arm/arm/machdep.c index 32bbbc6235d3..1c422f3b7d8c 100644 --- a/sys/arm/arm/machdep.c +++ b/sys/arm/arm/machdep.c @@ -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; } diff --git a/sys/arm/arm/vm_machdep.c b/sys/arm/arm/vm_machdep.c index 223ad96cfb39..895a14ce6b56 100644 --- a/sys/arm/arm/vm_machdep.c +++ b/sys/arm/arm/vm_machdep.c @@ -134,7 +134,7 @@ cpu_fork(register struct thread *td1, register struct proc *p2, 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;