perfmon: frontend and backend boundness bundles

Renamed memory stalls to topdown backend-bound-mem, added topdown
frontend-bound-latency and frontend-bound-bandwidth.

Type: improvement

Signed-off-by: Ray Kinsella <mdr@ashroe.eu>
Change-Id: I70f42b6b63fe2502635cad4aed4271e2bbdda5f1

6 files changed, 334 insertions, 68 deletions

diff --git a/src/plugins/perfmon/CMakeLists.txt b/src/plugins/perfmon/CMakeLists.txt
index 44be59ef539..e262984b610 100644
--- a/src/plugins/perfmon/CMakeLists.txt
+++ b/src/plugins/perfmon/CMakeLists.txt
@@ -23,7 +23,7 @@ add_vpp_plugin(perfmon
   perfmon.c
   intel/core.c
   intel/uncore.c
-  intel/bundle/memory_stalls.c
+  intel/bundle/backend_bound_mem.c
   intel/bundle/inst_and_clock.c
   intel/bundle/load_blocks.c
   intel/bundle/mem_bw.c
@@ -32,6 +32,8 @@ add_vpp_plugin(perfmon
   intel/bundle/power_license.c
   intel/bundle/topdown_metrics.c
   intel/bundle/topdown_tremont.c
+  intel/bundle/frontend_bound_bw.c
+  intel/bundle/frontend_bound_lat.c
   intel/bundle/iio_bw.c
 
   COMPONENT
diff --git a/src/plugins/perfmon/intel/bundle/backend_bound_mem.c b/src/plugins/perfmon/intel/bundle/backend_bound_mem.c
new file mode 100644
index 00000000000..ccf1ed12153
--- /dev/null
+++ b/src/plugins/perfmon/intel/bundle/backend_bound_mem.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021 Intel and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <perfmon/perfmon.h>
+#include <perfmon/intel/core.h>
+
+enum
+{
+  STALLS_L1D_MISS = 0,
+  STALLS_L2_MISS = 1,
+  STALLS_L3_MISS = 2,
+  STALLS_MEM_ANY = 3,
+  STALLS_TOTAL = 4,
+  BOUND_ON_STORES = 5,
+  FB_FULL = 6,
+  THREAD = 7,
+};
+
+static u8 *
+format_intel_backend_bound_mem (u8 *s, va_list *args)
+{
+  perfmon_node_stats_t *ss = va_arg (*args, perfmon_node_stats_t *);
+  int row = va_arg (*args, int);
+  f64 sv = 0;
+
+  if (!ss->n_packets)
+    return s;
+
+  if (0 == row)
+    {
+      sv = ss->value[THREAD] / ss->n_packets;
+
+      s = format (s, "%.0f", sv);
+      return s;
+    }
+
+  switch (row)
+    {
+    case 1:
+      sv = ss->value[BOUND_ON_STORES];
+      break;
+    case 2:
+      sv = ss->value[STALLS_MEM_ANY] - ss->value[STALLS_L1D_MISS];
+      break;
+    case 3:
+      sv = ss->value[FB_FULL];
+      break;
+    case 4:
+      sv = ss->value[STALLS_L1D_MISS] - ss->value[STALLS_L2_MISS];
+      break;
+    case 5:
+      sv = ss->value[STALLS_L2_MISS] - ss->value[STALLS_L3_MISS];
+      break;
+    case 6:
+      sv = ss->value[STALLS_L3_MISS];
+      break;
+    }
+
+  sv = clib_max ((sv / ss->value[THREAD]) * 100, 0);
+
+  s = format (s, "%04.1f", sv);
+
+  return s;
+}
+
+static perfmon_cpu_supports_t backend_bound_mem_cpu_supports[] = {
+  { clib_cpu_supports_avx512_bitalg, PERFMON_BUNDLE_TYPE_NODE },
+};
+
+PERFMON_REGISTER_BUNDLE (intel_core_backend_bound_mem) = {
+  .name = "td-backend-mem",
+  .description = "Topdown BackEnd-bound Memory - % cycles not retiring "
+		 "instructions due to memory stalls",
+  .source = "intel-core",
+  .events[0] = INTEL_CORE_E_CYCLE_ACTIVITY_STALLS_L1D_MISS, /* 0x0F */
+  .events[1] = INTEL_CORE_E_CYCLE_ACTIVITY_STALLS_L2_MISS,  /* 0x0F */
+  .events[2] = INTEL_CORE_E_CYCLE_ACTIVITY_STALLS_L3_MISS,  /* 0x0F */
+  .events[3] = INTEL_CORE_E_CYCLE_ACTIVITY_STALLS_MEM_ANY,  /* 0xFF */
+  .events[4] = INTEL_CORE_E_CYCLE_ACTIVITY_STALLS_TOTAL,    /* 0xFF */
+  .events[5] = INTEL_CORE_E_EXE_ACTIVITY_BOUND_ON_STORES,   /* 0xFF */
+  .events[6] = INTEL_CORE_E_L1D_PEND_MISS_FB_FULL,	    /* 0x0F */
+  .events[7] = INTEL_CORE_E_CPU_CLK_UNHALTED_THREAD_P,	    /* 0xFF */
+  .n_events = 8,
+  .format_fn = format_intel_backend_bound_mem,
+  .cpu_supports = backend_bound_mem_cpu_supports,
+  .n_cpu_supports = ARRAY_LEN (backend_bound_mem_cpu_supports),
+  .column_headers = PERFMON_STRINGS ("Clocks/Packet", "%Store Bound",
+				     "%L1 Bound", "%FB Full", "%L2 Bound",
+				     "%L3 Bound", "%DRAM Bound"),
+};
diff --git a/src/plugins/perfmon/intel/bundle/frontend_bound_bw.c b/src/plugins/perfmon/intel/bundle/frontend_bound_bw.c
new file mode 100644
index 00000000000..5e5835a7868
--- /dev/null
+++ b/src/plugins/perfmon/intel/bundle/frontend_bound_bw.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2022 Intel and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <perfmon/perfmon.h>
+#include <perfmon/intel/core.h>
+
+enum
+{
+  DSB_UOPS,
+  MS_UOPS,
+  MITE_UOPS,
+  LSD_UOPS,
+};
+
+static u8 *
+format_intel_frontend_bound_bw (u8 *s, va_list *args)
+{
+  perfmon_node_stats_t *ss = va_arg (*args, perfmon_node_stats_t *);
+  int row = va_arg (*args, int);
+  f64 sv = 0;
+  f64 uops = ss->value[DSB_UOPS] + ss->value[MS_UOPS] + ss->value[MITE_UOPS] +
+	     ss->value[LSD_UOPS];
+
+  if (!ss->n_packets)
+    return s;
+
+  if (row == 0)
+    {
+      sv = uops / ss->n_packets;
+      s = format (s, "%.0f", sv);
+
+      return s;
+    }
+
+  switch (row)
+    {
+    case 1:
+      sv = (ss->value[DSB_UOPS] / uops) * 100;
+      break;
+    case 2:
+      sv = (ss->value[MS_UOPS] / uops) * 100;
+      break;
+    case 3:
+      sv = (ss->value[MITE_UOPS] / uops) * 100;
+      break;
+    case 4:
+      sv = (ss->value[LSD_UOPS] / uops) * 100;
+      break;
+    }
+
+  s = format (s, "%04.1f", sv);
+
+  return s;
+}
+
+static perfmon_cpu_supports_t frontend_bound_bw_cpu_supports[] = {
+  { clib_cpu_supports_avx512_bitalg, PERFMON_BUNDLE_TYPE_NODE },
+};
+
+PERFMON_REGISTER_BUNDLE (intel_core_frontend_bound_bw) = {
+  .name = "td-frontend-bw",
+  .description =
+    "Topdown FrontEnd-bound BandWidth - % uops from each uop fetch source",
+  .source = "intel-core",
+  .events[0] = INTEL_CORE_E_IDQ_DSB_UOPS,  /* 0x0F */
+  .events[1] = INTEL_CORE_E_IDQ_MS_UOPS,   /* 0x0F */
+  .events[2] = INTEL_CORE_E_IDQ_MITE_UOPS, /* 0x0F */
+  .events[3] = INTEL_CORE_E_LSD_UOPS,	   /* 0x0F */
+  .n_events = 4,
+  .format_fn = format_intel_frontend_bound_bw,
+  .cpu_supports = frontend_bound_bw_cpu_supports,
+  .n_cpu_supports = ARRAY_LEN (frontend_bound_bw_cpu_supports),
+  .column_headers = PERFMON_STRINGS ("UOPs/PKT", "% DSB UOPS", "% MS UOPS",
+				     "% MITE UOPS", "% LSD UOPS"),
+  .footer =
+    "For more information, see the Intel(R) 64 and IA-32 Architectures\n"
+    "Optimization Reference Manual section on the Front End.",
+};
diff --git a/src/plugins/perfmon/intel/bundle/frontend_bound_lat.c b/src/plugins/perfmon/intel/bundle/frontend_bound_lat.c
new file mode 100644
index 00000000000..aea2149663f
--- /dev/null
+++ b/src/plugins/perfmon/intel/bundle/frontend_bound_lat.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2022 Intel and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <perfmon/perfmon.h>
+#include <perfmon/intel/core.h>
+
+static const int MS_Switches_Cost = 3;
+static const int BA_Clear_Cost = 10;
+
+enum
+{
+  ICACHE_MISS,
+  DSB_SWITCHES,
+  RESTEER,
+  MS_SWITCHES,
+  BACLEARS,
+  THREAD,
+};
+
+static u8 *
+format_intel_frontend_bound_lat (u8 *s, va_list *args)
+{
+  perfmon_node_stats_t *ss = va_arg (*args, perfmon_node_stats_t *);
+  int row = va_arg (*args, int);
+  f64 sv = 0;
+  f64 cycles = ss->value[THREAD];
+
+  if (!ss->n_packets)
+    return s;
+
+  if (!row)
+    {
+      sv = ss->value[THREAD] / ss->n_packets;
+
+      s = format (s, "%.0f", sv);
+
+      return s;
+    }
+
+  switch (row)
+    {
+    case 1:
+      sv = ss->value[ICACHE_MISS] / cycles;
+      break;
+    case 2:
+      sv = ss->value[DSB_SWITCHES] / cycles;
+      break;
+    case 3:
+      sv =
+	(ss->value[RESTEER] + (ss->value[BACLEARS] * BA_Clear_Cost)) / cycles;
+      break;
+    case 4:
+      sv = (ss->value[MS_SWITCHES] * MS_Switches_Cost) / cycles;
+      break;
+    }
+
+  s = format (s, "%04.1f", sv * 100);
+
+  return s;
+}
+
+static perfmon_cpu_supports_t frontend_bound_lat_cpu_supports[] = {
+  { clib_cpu_supports_avx512_bitalg, PERFMON_BUNDLE_TYPE_NODE },
+};
+
+PERFMON_REGISTER_BUNDLE (intel_core_frontend_bound_lat) = {
+  .name = "td-frontend-lat",
+  .description = "Topdown FrontEnd-bound Latency - % cycles not retiring uops "
+		 "due to frontend latency",
+  .source = "intel-core",
+  .events[0] = INTEL_CORE_E_ICACHE_16B_IFDATA_STALL,	      /* 0x0F */
+  .events[1] = INTEL_CORE_E_DSB2MITE_SWITCHES_PENALTY_CYCLES, /* 0x0F */
+  .events[2] = INTEL_CORE_E_INT_MISC_CLEAR_RESTEER_CYCLES,    /* 0xFF */
+  .events[3] = INTEL_CORE_E_IDQ_MS_SWITCHES,		      /* 0x0F */
+  .events[4] = INTEL_CORE_E_BACLEARS_ANY,		      /* 0x0F */
+  .events[5] = INTEL_CORE_E_CPU_CLK_UNHALTED_THREAD_P,	      /* FIXED */
+  .n_events = 6,
+  .format_fn = format_intel_frontend_bound_lat,
+  .cpu_supports = frontend_bound_lat_cpu_supports,
+  .n_cpu_supports = ARRAY_LEN (frontend_bound_lat_cpu_supports),
+  .column_headers = PERFMON_STRINGS ("Clocks/Packet", "% iCache Miss",
+				     "% DSB Switch", "% Branch Resteer",
+				     "% MS Switch"),
+  .footer =
+    "For more information, see the Intel(R) 64 and IA-32 Architectures\n"
+    "Optimization Reference Manual on the Front End.",
+};
diff --git a/src/plugins/perfmon/intel/bundle/memory_stalls.c b/src/plugins/perfmon/intel/bundle/memory_stalls.c
deleted file mode 100644
index 3de3a615732..00000000000
--- a/src/plugins/perfmon/intel/bundle/memory_stalls.c
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * Copyright (c) 2021 Intel and/or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <perfmon/perfmon.h>
-#include <perfmon/intel/core.h>
-
-static u8 *
-format_intel_memory_stalls (u8 *s, va_list *args)
-{
-  perfmon_node_stats_t *ss = va_arg (*args, perfmon_node_stats_t *);
-  int row = va_arg (*args, int);
-  f64 sv = 0;
-
-  if (!ss->n_packets)
-    return s;
-
-  sv = ss->value[row] / ss->n_packets;
-
-  s = format (s, "%5.0f", sv);
-
-  return s;
-}
-
-static perfmon_cpu_supports_t memory_stalls_cpu_supports[] = {
-  { clib_cpu_supports_avx512_bitalg, PERFMON_BUNDLE_TYPE_NODE },
-};
-
-PERFMON_REGISTER_BUNDLE (intel_core_memory_stalls) = {
-  .name = "memory-stalls",
-  .description = "cycles not retiring instructions due to memory stalls",
-  .source = "intel-core",
-  .events[0] = INTEL_CORE_E_CPU_CLK_UNHALTED_THREAD_P,	      /* FIXED */
-  .events[1] = INTEL_CORE_E_CYCLE_ACTIVITY_CYCLES_NO_EXECUTE, /*CMask: 0xFF*/
-  .events[2] = INTEL_CORE_E_CYCLE_ACTIVITY_STALLS_MEM_ANY,    /*CMask: 0xFF*/
-  .events[3] = INTEL_CORE_E_CYCLE_ACTIVITY_STALLS_L1D_MISS,   /*CMask: 0xF*/
-  .events[4] = INTEL_CORE_E_L1D_PEND_MISS_FB_FULL,	      /*CMask: 0xF*/
-  .events[5] = INTEL_CORE_E_CYCLE_ACTIVITY_STALLS_L3_MISS,    /*CMask: 0xF*/
-  .events[6] = INTEL_CORE_E_SQ_MISC_SQ_FULL,		      /*CMask: 0xF*/
-  .n_events = 7,
-  .format_fn = format_intel_memory_stalls,
-  .cpu_supports = memory_stalls_cpu_supports,
-  .n_cpu_supports = ARRAY_LEN (memory_stalls_cpu_supports),
-  .column_headers = PERFMON_STRINGS ("Cycles/Packet", "Cycles Stall/Packet",
-				     "Mem Stall/Packet",
-				     "L1D Miss Stall/Packet", "FB Full/Packet",
-				     "L3 Miss Stall/Packet", "SQ Full/Packet"),
-};
diff --git a/src/plugins/perfmon/intel/core.h b/src/plugins/perfmon/intel/core.h
index 320d09fd7c5..31daf273517 100644
--- a/src/plugins/perfmon/intel/core.h
+++ b/src/plugins/perfmon/intel/core.h
@@ -89,6 +89,12 @@
   _ (0x0D, 0x01, 0, 0, 0, 0x00, INT_MISC, RECOVERY_CYCLES,                    \
      "Core cycles the allocator was stalled due to recovery from earlier "    \
      "clear event for this thread (e.g. misprediction or memory nuke)")       \
+  _ (0x0D, 0x10, 0, 0, 0, 0x00, INT_MISC, UOP_DROPPING,                       \
+     "Estimated number of Top-down Microarchitecture Analysis slots that got" \
+     " due to non front-end reasons")                                         \
+  _ (0x0D, 0x80, 0, 0, 0, 0x00, INT_MISC, CLEAR_RESTEER_CYCLES,               \
+     "Counts cycles after recovery from a branch misprediction or machine"    \
+     "clear till the first uop is issued from the resteered path.")           \
   _ (0x0E, 0x01, 0, 0, 0, 0x00, UOPS_ISSUED, ANY,                             \
      "Uops that Resource Allocation Table (RAT) issues to Reservation "       \
      "Station (RS)")                                                          \
@@ -123,9 +129,23 @@
   _ (0x51, 0x01, 0, 0, 0, 0x00, L1D, REPLACEMENT,                             \
      "L1D data line replacements")                                            \
   _ (0x51, 0x04, 0, 0, 0, 0x00, L1D, M_EVICT, "L1D data line evictions")      \
-  _ (0x83, 0x02, 0, 0, 0, 0x00, ICACHE_64B, IFTAG_MISS,                       \
-     "Instruction fetch tag lookups that miss in the instruction cache "      \
-     "(L1I). Counts at 64-byte cache-line granularity.")                      \
+  _ (0x79, 0x04, 0, 0, 0, 0x00, IDQ, MITE_UOPS,                               \
+     "Counts the number of uops delivered to Instruction Decode Queue (IDQ) " \
+     "from the MITE path.")                                                   \
+  _ (0x79, 0x08, 0, 0, 0, 0x00, IDQ, DSB_UOPS,                                \
+     "Counts the number of uops delivered to Instruction Decode Queue (IDQ) " \
+     "from the Decode Stream Buffer (DSB) path.")                             \
+  _ (0x79, 0x30, 0, 0, 0, 0x00, IDQ, MS_UOPS,                                 \
+     "Counts the number of uops delivered to Instruction Decode Queue (IDQ) " \
+     "from the Microcode Sequencer (MS) path.")                               \
+  _ (0x79, 0x30, 1, 0, 0, 0x01, IDQ, MS_SWITCHES,                             \
+     "Number of switches from DSB or MITE to the MS")                         \
+  _ (                                                                         \
+    0x80, 0x04, 0, 0, 0, 0x00, ICACHE_16B, IFDATA_STALL,                      \
+    "Cycles where a code fetch is stalled due to L1 instruction cache miss.") \
+  _ (0x83, 0x04, 0, 0, 0, 0x00, ICACHE_64B, IFTAG_STALL,                      \
+     "Cycles where a code fetch is stalled due to L1 instruction cache tag "  \
+     "miss.")                                                                 \
   _ (0x9C, 0x01, 0, 0, 0, 0x00, IDQ_UOPS_NOT_DELIVERED, CORE,                 \
      "Uops not delivered to Resource Allocation Table (RAT) per thread when " \
      "backend of the machine is not stalled")                                 \
@@ -134,9 +154,8 @@
      "full. This counts cycles that the pipeline back-end blocked uop "       \
      "delivery"                                                               \
      "from the front-end.")                                                   \
-  _ (0xA3, 0x04, 0, 0, 0, 0x04, CYCLE_ACTIVITY, CYCLES_NO_EXECUTE,            \
-     "This event counts cycles during which no instructions were executed in" \
-     " the execution stage of the pipeline.")                                 \
+  _ (0xA3, 0x04, 0, 0, 0, 0x04, CYCLE_ACTIVITY, STALLS_TOTAL,                 \
+     "Total execution stalls.")                                               \
   _ (0xA3, 0x05, 0, 0, 0, 0x05, CYCLE_ACTIVITY, STALLS_L2_MISS,               \
      "Execution stalls while L2 cache miss demand load is outstanding")       \
   _ (0xA3, 0x06, 0, 0, 0, 0x06, CYCLE_ACTIVITY, STALLS_L3_MISS,               \
@@ -145,6 +164,17 @@
      "Execution stalls while L1 cache miss demand load is outstanding")       \
   _ (0xA3, 0x14, 0, 0, 0, 0x14, CYCLE_ACTIVITY, STALLS_MEM_ANY,               \
      "Execution stalls while memory subsystem has an outstanding load.")      \
+  _ (0xA6, 0x40, 0, 0, 0, 0x02, EXE_ACTIVITY, BOUND_ON_STORES,                \
+     "Cycles where the Store Buffer was full and no loads caused an "         \
+     "execution stall.")                                                      \
+  _ (0xA8, 0x01, 0, 0, 0, 0x00, LSD, UOPS,                                    \
+     "Counts the number of uops delivered to the back-end by the LSD"         \
+     "(Loop Stream Detector)")                                                \
+  _ (0xAB, 0x02, 0, 0, 0, 0x00, DSB2MITE_SWITCHES, PENALTY_CYCLES,            \
+     "This event counts fetch penalty cycles when a transition occurs from"   \
+     "DSB to MITE.")                                                          \
+  _ (0xB1, 0x01, 0, 0, 0, 0x00, UOPS_EXECUTED, THREAD,                        \
+     "Counts the number of uops to be executed per-thread each cycle.")       \
   _ (0xC0, 0x00, 0, 0, 0, 0x00, INST_RETIRED, ANY_P,                          \
      "Number of instructions retired. General Counter - architectural event") \
   _ (0xC2, 0x02, 0, 0, 0, 0x00, UOPS_RETIRED, RETIRE_SLOTS,                   \
@@ -155,8 +185,6 @@
      "All mispredicted macro branch instructions retired.")                   \
   _ (0xC4, 0x20, 0, 0, 0, 0x00, BR_INST_RETIRED, NEAR_TAKEN,                  \
      "Taken branch instructions retired.")                                    \
-  _ (0xD0, 0x81, 0, 0, 0, 0x00, MEM_INST_RETIRED, ALL_LOADS,                  \
-     "All retired load instructions.")                                        \
   _ (0xD0, 0x82, 0, 0, 0, 0x00, MEM_INST_RETIRED, ALL_STORES,                 \
      "All retired store instructions.")                                       \
   _ (0xD1, 0x01, 0, 0, 0, 0x00, MEM_LOAD_RETIRED, L1_HIT,                     \
@@ -198,6 +226,10 @@
   _ (0xD3, 0x08, 0, 0, 0, 0x00, MEM_LOAD_L3_MISS_RETIRED, REMOTE_FWD,         \
      "Retired load instructions whose data sources was forwarded from a "     \
      "remote cache")                                                          \
+  _ (0xE6, 0x01, 0, 0, 0, 0x00, BACLEARS, ANY,                                \
+     "Counts the total number when the front end is resteered, mainly when "  \
+     "the BPU cannot provide a correct prediction and this is corrected by "  \
+     "other branch handling mechanisms at the front end.")                    \
   _ (0xF0, 0x40, 0, 0, 0, 0x00, L2_TRANS, L2_WB,                              \
      "L2 writebacks that access L2 cache")                                    \
   _ (0xF1, 0x1F, 0, 0, 0, 0x00, L2_LINES_IN, ALL,                             \