tree 6660a0eaa05954ba69f0693b5ee52fad94860c7c
parent 67d5358e2a870f9e9447517bfa49bf5c6b410a50
author Martyn Capewell <martyn.capewell@arm.com> 1259945098 +0000
committer Dave Butcher <david.butcher@arm.com> 1275062676 +0100

Adds support for UBFX to JIT and Disassembler

This introduces UBFX instruction generation abilities to the Pixelflinger JIT,
and also modifies the component extraction function to generate the
instruction.

The extract function contains defines to prevent generation of UBFX on pre-v7
cores. The JIT itself retains the ability to produce the instruction even on
v5/6.

This patch only generates UBFX when MOV, AND or BIC can't be used. Based on
the TRM, this appears to be faster on A9 than using UBFX in all cases.

On startup, Pixelflinger JITs three chunks of code. UBFX improves these as
follows:

 00000077:03515104_00000000_00000000
 (Blends a single colour into an RGB565 buffer.)
  Before: 27 inst/pixel, After: 24 inst/pixel, Improvement: 12.5%
 00000077:03545404_00000A01_00000000
 (Blends RGBA8888 texture into an RGB565 buffer using alpha.)
  Before: 30 inst/pixel, After: 27 inst/pixel, Improvement: 11.1%
 00000077:03545404_00000A04_00000000
 (Blends RGB565 texture into an RGB565 buffer using alpha.)
  Before: 29 inst/pixel, After: 27 inst/pixel, Improvement: 7.4%