sub is also recognized as zeroing idiom for register file. Intel documents these in "3.5.1.7 Clearing Registers and Dependency Breaking Idioms" from Optimizatio

sub is also recognized as zeroing idiom for register file. Intel documents these in "3.5.1.7 Clearing Registers and Dependency Breaking Idioms" from Optimization Reference Manual: https://www.intel.com/content/www/us/en/developer/articles/technical/intel64-and-ia32-architectures-optimization.html https://www.intel.com/content/www/us/en/developer/articles/t... Here's html version: https://zzqcn.github.io/perf/intel_opt_manual/3.html#clearing-registers-and-dependency-breaking-idioms https://zzqcn.github.io/perf/intel_opt_manual/3.html#clearin... AMD has similar list in "2.9.2 Idioms for Dependency removal" from "Software Optimization Guide for the AMD Zen5 Microarchitecture" document: https://docs.amd.com/v/u/en-US/58455_1.00 https://docs.amd.com/v/u/en-US/58455_1.00