RFR(M) JDK-8181809 PPC64: Leverage mtfprd/mffprd on POWER8

John Paul Adrian Glaubitz glaubitz at physik.fu-berlin.de
Tue Jun 20 13:44:07 UTC 2017

Hi Matthew!

On Mon, Jun 19, 2017 at 11:27:36AM -0500, Matthew Brandyberry wrote:
> This is a PPC-specific hotspot optimization that leverages the mtfprd/mffprd
> instructions for for movement between general purpose and floating point
> registers (rather than through memory).

Do these instructions also exist on POWER5 or is this POWER8+ only?


 .''`.  John Paul Adrian Glaubitz
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