gitweb.dragonflybsd.org Git - dragonfly.git/commit - sys/platform/vkernel64/x86_64/cpu

author	John Marino <netbsd@marino.st>
	Thu, 12 Jul 2012 11:15:12 +0000 (13:15 +0200)
committer	John Marino <draco@marino.st>
	Thu, 12 Jul 2012 11:34:07 +0000 (13:34 +0200)
commit	a8f1df175ae170933e9bcd35269f24460dabc606
tree	bf561750a4303a003e1081cb593a1045111c2eae	tree \| snapshot
parent	2a180eab7fa5501b3960ba7fb20834f3f355b184	commit \| diff

x86_64 FPU: Set 64-bit precision for fadd/fsub/fsqrt etc.

On AMD64, GCC and the ABI expects the x87 unit to be running in 80/64
mode rather than 64/53 mode seen on i386. This corrects errors seen
in long double tests involving runtime calculations. Previously, the
results of these runtime calculations would get rounded due to use
of 53-bit mantissas.

DragonFly Project Source

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sys/platform/pc64/x86_64/machdep.c		diff \| blob \| blame \| history
sys/platform/pc64/x86_64/mp_machdep.c		diff \| blob \| blame \| history
sys/platform/pc64/x86_64/npx.c		diff \| blob \| blame \| history
sys/platform/vkernel64/x86_64/cpu_regs.c		diff \| blob \| blame \| history
sys/platform/vkernel64/x86_64/npx.c		diff \| blob \| blame \| history