公开(公告)号：US20140281439A1

公开(公告)日：2014-09-18

申请号：US13832119

申请日：2013-03-15

Applicant: QUALCOMM INCORPORATED

Inventor： Vimal K. Reddy ,  Niket K. Choudhary ,  Michael William Morrow

IPC: G06F9/38

CPC classification number: G06F9/30058 ,  G06F9/30069 ,  G06F9/30145 ,  G06F9/3017

Abstract: Methods and apparatuses for optimizing hard-to-predict short forward branches. A method detects a forward conditional branch with at least one instruction between the forward conditional branch and forward conditional branch target. The method determines whether a first of the at least one instruction includes at least one of a conditional branch or a condition-code setter. If the first instruction does not have the at least one of a conditional branch or a condition-code setter, the first instruction is dynamically assigned an inverted condition to optimize a code path. The method determines if there is a next instruction between the forward conditional branch and its target. If there is, the method analyzes the next instruction. If there is no next instruction, the method executes the optimized code path. If the instruction includes the conditional branch or condition-code setter, it discards dynamic assignments and executes the detected forward conditional branch.

Abstract translation: 优化难以预测的短期分支的方法和装置。 一种方法使用前向条件分支和前向条件分支目标之间的至少一条指令检测前向条件分支。 该方法确定至少一个指令中的第一个是否包括条件分支或条件码设置器中的至少一个。 如果第一指令不具有条件分支或条件码设置器中的至少一个，则第一指令被动态地分配反转条件以优化代码路径。 该方法确定在前向条件分支与其目标之间是否存在下一条指令。 如果有，则该方法分析下一条指令。 如果没有下一条指令，则该方法执行优化的代码路径。 如果指令包括条件分支或条件代码设置器，它将丢弃动态分配并执行检测到的前向条件分支。