https://bugs.llvm.org/show_bug.cgi?id=41686
Bug ID: 41686
Summary: gather cycle counts inaccurate on Intel Hardware
Product: tools
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: llvm-mca
Assignee: unassignedb...@nondot.org
Reporter: jon.kenn...@intel.com
CC: andrea.dibia...@gmail.com, llvm-bugs@lists.llvm.org,
matthew.da...@sony.com
https://godbolt.org/z/yA_GLT
The above code snippet approximates the sequence of instructions (from the
inner loop) to take approx 3303 cycles for 100 iterations. This includes a
gather.
When run on a real skylake based CPU (i7-8700K), it takes approximately ~1230
cycles.
Please update the latency/throughput numbers for the gather instruction within
llvm-mca to better reflect the real performance of the intel architectures.
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
