Apologies for the bad cut-and-paste job.. the body of this review request should read as follows: This is a PPC-specific hotspot optimization that leverages the extrdi instruction for bitfield extract operations (shift-right and mask-with-and). It yields a ~25% improvement measured via a microbenchmark. Please review: Bug: https://bugs.openjdk.java.net/browse/JDK-8181810 Webrev: http://cr.openjdk.java.net/~gromero/8181810/v1/ Thanks, Matt On 6/19/17 11:30 AM, 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). It yields a ~35% improvement measured via a microbenchmark.
Please review:
Bug: https://bugs.openjdk.java.net/browse/JDK-8181809 Webrev: http://cr.openjdk.java.net/~gromero/8181809/v1/
Thanks, Matt