[Bug rtl-optimization/62011] New: False Data Dependency in popcnt instruction

2014-08-04 Thread debiandev at gmail dot com
: rtl-optimization Assignee: unassigned at gcc dot gnu.org Reporter: debiandev at gmail dot com On Sandy/Ivy Bridge and Haswell processors, the instruction: popcnt src, dest appears to have a false dependency on the destination register dest. Even though the instruction only

[Bug target/62011] False Data Dependency in popcnt instruction

2014-08-05 Thread debiandev at gmail dot com
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62011 --- Comment #3 from Andev --- This seems to be specific to some latest Intel CPUs. I am not sure which other CPUs are affected. There is no official errata for this behavior AFAIK. As Alexander suggested, it would be a great idea to have a work