Every branch instruction that has a predictable behavior needs to have its behavior history properly established in the prediction table before a meaningful prediction can be made.
How to appease such a performance-degrading effect from branch instructions, which typically make up twenty or more percentage of an instruction stream, has to be paid with more attention.
Branch Prediction--Implements an algorithm for conditional branches so that the most executed branch immediately follows the branch instruction
(soon to be released).
Typically, a branch instruction takes two clocks to execute: one to fetch and one to calculate the loop address.
The advantage being, once detected and saved, upon each pass through the loop, the branch instruction is replaced with the instruction pointed to by the loop address.
This optimization strategy works not exactly for the RGB to HSL color space converter, because several branch instructions
, see Equ.
The base Xtensa ISA also provides powerful branch instructions
and complex bit manipulations.
The small-code model takes advantage of efficient forms of call and branch instructions
, while the small-data model utilizes compact instructions for accessing data in Microchip's 16-bit architectures.
The TIE language -- a derivative of the popular Verilog language -- has been enhanced in this release to support designer-defined conditional load and store instructions, which results in code that utilizes fewer branch instructions
and thus delivers better overall performance.
All MCU instructions are fixed-length (12 bits), and partially executed branch instructions
can be canceled to enable immediate response when an interrupt is detected.