https://bugs.llvm.org/show_bug.cgi?id=38951
Bug ID: 38951
Summary: [llvm-exegesis] PfmIssueCounter for uops in amdfam15h
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: lebedev...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 20882
--> https://bugs.llvm.org/attachment.cgi?id=20882&action=edit
uops measurements
On amdfam15h (BdVer2, Piledriver), the uops measurement is problematic.
My current config:
let SchedModel = BdVer2Model in {
def PdCycleCounter : PfmCycleCounter<"cpu_clk_unhalted">;
def PdEXCounter : PfmIssueCounter<PdEX, // Technically, PdEX
["retired_uops"]>;
def PdFPU0Counter : PfmIssueCounter<PdFPU0,
["dispatched_fpu_ops:ops_pipe0",
"dispatched_fpu_ops:ops_dual_pipe0"]>;
def PdFPU1Counter : PfmIssueCounter<PdFPU1,
["dispatched_fpu_ops:ops_pipe1",
"dispatched_fpu_ops:ops_dual_pipe1"]>;
def PdFPU2Counter : PfmIssueCounter<PdFPU2,
["dispatched_fpu_ops:ops_pipe2",
"dispatched_fpu_ops:ops_dual_pipe2"]>;
def PdFPU3Counter : PfmIssueCounter<PdFPU3,
["dispatched_fpu_ops:ops_pipe3",
"dispatched_fpu_ops:ops_dual_pipe3"]>;
// NOTE: it would seem, there are not uops counters for any other pipes.
}
The fpu stuff seems to work.
But retired_uops is not specific to the EX/AGU units.
And i don't see any other, EX/AGU-specific ones.
It counts all the uops, to all the units. The dual-issue uop is counted as one
uop.
So it would be more correct to define this as:
PdUOpsTotal = retired_uops
PdEXCounter = PdUOpsTotal - PdFPU0Counter - PdFPU1Counter - PdFPU2Counter -
PdFPU3Counter
I think?
I don't have any ideas, i just though i'd bring this up.
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