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| /freebsd-11-stable/sys/arm/include/ | ||
| H A D | md_var.h | diff 288983 Wed Oct 07 07:28:18 MDT 2015 kib A follow-up to r288492. In fact, revert the mentioned commit for pre-VFPv3 processors, since they do require software support code to handle denormals. For VFPv3 and later, enable flush-to-zero if hardware does not claim full denormals arithmetic support by VMVFR1_FZ field in mvfr1 register. The end result is that we do use correct fpu environment on Cortexes with VFPv3, while ARM11 (e.g. rpi) is in non-compliant flush-to-zero mode. At least CPUs without complete hardware implementation of IEEE 754 do not cause unhandled floating point exception on underflow, as it was before r288492. Noted by: ian Tested by: gjb Sponsored by: The FreeBSD Foundation MFC after: 1 week |
| /freebsd-11-stable/sys/arm/arm/ | ||
| H A D | vfp.c | diff 288983 Wed Oct 07 07:28:18 MDT 2015 kib A follow-up to r288492. In fact, revert the mentioned commit for pre-VFPv3 processors, since they do require software support code to handle denormals. For VFPv3 and later, enable flush-to-zero if hardware does not claim full denormals arithmetic support by VMVFR1_FZ field in mvfr1 register. The end result is that we do use correct fpu environment on Cortexes with VFPv3, while ARM11 (e.g. rpi) is in non-compliant flush-to-zero mode. At least CPUs without complete hardware implementation of IEEE 754 do not cause unhandled floating point exception on underflow, as it was before r288492. Noted by: ian Tested by: gjb Sponsored by: The FreeBSD Foundation MFC after: 1 week |
| H A D | vm_machdep.c | diff 288983 Wed Oct 07 07:28:18 MDT 2015 kib A follow-up to r288492. In fact, revert the mentioned commit for pre-VFPv3 processors, since they do require software support code to handle denormals. For VFPv3 and later, enable flush-to-zero if hardware does not claim full denormals arithmetic support by VMVFR1_FZ field in mvfr1 register. The end result is that we do use correct fpu environment on Cortexes with VFPv3, while ARM11 (e.g. rpi) is in non-compliant flush-to-zero mode. At least CPUs without complete hardware implementation of IEEE 754 do not cause unhandled floating point exception on underflow, as it was before r288492. Noted by: ian Tested by: gjb Sponsored by: The FreeBSD Foundation MFC after: 1 week |
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