[llvm] r335099 - [X86][Znver1] Specify Register Files, RCU; FP scheduler capacity.

[Roman Lebedev via llvm-commits]

Author: lebedevri
Date: Wed Jun 20 00:01:14 2018
New Revision: 335099

URL: http://llvm.org/viewvc/llvm-project?rev=335099&view=rev
Log:
[X86][Znver1] Specify Register Files, RCU; FP scheduler capacity.

Summary:
First off: i do not have any access to that processor,
so this is purely theoretical, no benchmarks.

I have been looking into b**d**ver2 scheduling profile, and while cross-referencing
the existing b**t**ver2, znver1 profiles, and the reference docs
(`Software Optimization Guide for AMD Family {15,16,17}h Processors`),
i have noticed that only b**t**ver2 scheduling profile specifies these.

Also, there is no mca test coverage.

Reviewers: RKSimon, craig.topper, courbet, GGanesh, andreadb

Reviewed By: GGanesh

Subscribers: gbedwell, vprasad, ddibyend, shivaram, Ashutosh, javed.absar, llvm-commits

Differential Revision: https://reviews.llvm.org/D47676

Modified:
    llvm/trunk/lib/Target/X86/X86ScheduleZnver1.td
    llvm/trunk/test/tools/llvm-mca/X86/register-file-statistics.s
    llvm/trunk/test/tools/llvm-mca/X86/scheduler-queue-usage.s

Modified: llvm/trunk/lib/Target/X86/X86ScheduleZnver1.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ScheduleZnver1.td?rev=335099&r1=335098&r2=335099&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ScheduleZnver1.td (original)
+++ llvm/trunk/lib/Target/X86/X86ScheduleZnver1.td Wed Jun 20 00:01:14 2018
@@ -55,7 +55,6 @@ def ZnFPU2 : ProcResource<1>;
 def ZnFPU3 : ProcResource<1>;
 
 // FPU grouping
-def ZnFPU     : ProcResGroup<[ZnFPU0, ZnFPU1, ZnFPU2, ZnFPU3]>;
 def ZnFPU013  : ProcResGroup<[ZnFPU0, ZnFPU1, ZnFPU3]>;
 def ZnFPU01   : ProcResGroup<[ZnFPU0, ZnFPU1]>;
 def ZnFPU12   : ProcResGroup<[ZnFPU1, ZnFPU2]>;
@@ -91,6 +90,32 @@ def ZnDivider : ProcResource<1>;
 // 4 Cycles load-to use Latency is captured
 def : ReadAdvance<ReadAfterLd, 4>;
 
+// The Integer PRF for Zen is 168 entries, and it holds the architectural and
+// speculative version of the 64-bit integer registers.
+// Reference: "Software Optimization Guide for AMD Family 17h Processors"
+def ZnIntegerPRF : RegisterFile<168, [GR8, GR16, GR32, GR64, CCR]>;
+
+// 36 Entry (9x4 entries) floating-point Scheduler
+def ZnFPU     : ProcResGroup<[ZnFPU0, ZnFPU1, ZnFPU2, ZnFPU3]> {
+let BufferSize=36;
+}
+
+// The Zen FP Retire Queue renames SIMD and FP uOps onto a pool of 160 128-bit
+// registers. Operations on 256-bit data types are cracked into two COPs.
+// Reference: "Software Optimization Guide for AMD Family 17h Processors"
+def ZnFpuPRF: RegisterFile<160, [VR64, VR128, VR256], [1, 1, 2]>;
+
+// The unit can track up to 192 macro ops in-flight.
+// The retire unit handles in-order commit of up to 8 macro ops per cycle.
+// Reference: "Software Optimization Guide for AMD Family 17h Processors"
+// To be noted, the retire unit is shared between integer and FP ops.
+// In SMT mode it is 96 entry per thread. But, we do not use the conservative
+// value here because there is currently no way to fully mode the SMT mode,
+// so there is no point in trying.
+def ZnRCU : RetireControlUnit<192, 8>;
+
+// FIXME: there are 72 read buffers and 44 write buffers.
+
 // (a folded load is an instruction that loads and does some operation)
 // Ex: ADDPD xmm,[mem]-> This instruction has two micro-ops
 // Instructions with folded loads are usually micro-fused, so they only appear

Modified: llvm/trunk/test/tools/llvm-mca/X86/register-file-statistics.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-mca/X86/register-file-statistics.s?rev=335099&r1=335098&r2=335099&view=diff
==============================================================================
--- llvm/trunk/test/tools/llvm-mca/X86/register-file-statistics.s (original)
+++ llvm/trunk/test/tools/llvm-mca/X86/register-file-statistics.s Wed Jun 20 00:01:14 2018
@@ -21,7 +21,17 @@ xor %eax, %ebx
 # BTVER2-NEXT:        Total number of mappings created: 0
 # BTVER2-NEXT:        Max number of mappings used:      0
 
+# ZNVER1:          *  Register File #1 -- ZnFpuPRF:
+# ZNVER1-NEXT:        Number of physical registers:     160
+# ZNVER1-NEXT:        Total number of mappings created: 0
+# ZNVER1-NEXT:        Max number of mappings used:      0
+
 # BTVER2:          *  Register File #2 -- JIntegerPRF:
 # BTVER2-NEXT:        Number of physical registers:     64
 # BTVER2-NEXT:        Total number of mappings created: 2
 # BTVER2-NEXT:        Max number of mappings used:      2
+
+# ZNVER1:          *  Register File #2 -- ZnIntegerPRF:
+# ZNVER1-NEXT:        Number of physical registers:     168
+# ZNVER1-NEXT:        Total number of mappings created: 2
+# ZNVER1-NEXT:        Max number of mappings used:      2

Modified: llvm/trunk/test/tools/llvm-mca/X86/scheduler-queue-usage.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-mca/X86/scheduler-queue-usage.s?rev=335099&r1=335098&r2=335099&view=diff
==============================================================================
--- llvm/trunk/test/tools/llvm-mca/X86/scheduler-queue-usage.s (original)
+++ llvm/trunk/test/tools/llvm-mca/X86/scheduler-queue-usage.s Wed Jun 20 00:01:14 2018
@@ -49,3 +49,4 @@ xor %eax, %ebx
 # ZNVER1:          Scheduler's queue usage:
 # ZNVER1-NEXT:     ZnAGU,  0/28
 # ZNVER1-NEXT:     ZnALU,  1/56
+# ZNVER1-NEXT:     ZnFPU,  0/36