Date: Sat, 23 Nov 2019 21:18:56 +0000 (UTC) From: Brandon Bergren <bdragon@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r355035 - head/sys/powerpc/booke Message-ID: <201911232118.xANLIuXd009877@repo.freebsd.org>
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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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