Author: bdragon
Date: Sat Nov 23 21:18:55 2019
New Revision: 355035
URL: https://svnweb.freebsd.org/changeset/base/355035
Log:
[PowerPC] Use QEMU-compatible version of SPE accumulator save
Switch from "evaddumiaaw 0,0" to "evmwumiaa 0,0,0" when persisting the
accumulator. This has the benefit of actually being implemented in QEMU
as it is the form Linux uses for the same task.
Both instructions are functionally equivilent, as we are using them for
their side effect of copying the accumulator to GPRs rather than for the
actual math operation that they are performing.
Reviewed by: jhibbits
Modified:
head/sys/powerpc/booke/spe.c
Modified: head/sys/powerpc/booke/spe.c
==============================================================================
--- head/sys/powerpc/booke/spe.c Sat Nov 23 19:35:09 2019
(r355034)
+++ head/sys/powerpc/booke/spe.c Sat Nov 23 21:18:55 2019
(r355035)
@@ -83,7 +83,7 @@ save_vec_int(struct thread *td)
#undef EVSTDW
__asm ( "evxor 0,0,0\n"
- "evaddumiaaw 0,0\n"
+ "evmwumiaa 0,0,0\n"
"evstdd 0,0(%0)" :: "b"(&pcb->pcb_vec.spare[0]));
pcb->pcb_vec.vscr = mfspr(SPR_SPEFSCR);
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