Date: Tue, 3 Apr 2001 11:10:39 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Bruce Evans <bde@zeta.org.au>, John Baldwin <jhb@FreeBSD.ORG>, Mark Murray <mark@grondar.za>, current@FreeBSD.ORG, "David O'Brien" <obrien@FreeBSD.ORG> Subject: Re: i586 FP optimizations hosed. Message-ID: <200104031810.f33IAd258887@earth.backplane.com> References: <Pine.BSF.4.21.0104032200080.32249-100000@besplex.bde.org> <200104031803.f33I3FM58726@earth.backplane.com>
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: * Kernel bcopy operation in case where no process switch occurs
: (i.e. current process was using the FP and while we went into
: kernel mode, we have not yet saved the FP state anywhere).
:
: if (process-A-using-FP) {
: push FP state for process A on stack
: push process-A-using-FP flag
: }
: set process-A-using-FP flag
: use FP registers to do bcopy
:
: restore process-A-using-FP flag from stack
: restore FP state from stack
Oops. I meant:
if (process-A-using-FP) {
push FP state for process A on stack
}
push process-A-using-FP flag
set process-A-using-FP flag
use FP registers to do bcopy
restore process-A-using-FP flag from stack
if (process-A-using-FP) {
restore FP state from stack
}
-Matt
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