Utility to dump instruction translation counts.

src/alloy/frontend/ppc/ppc_hir_builder.cc

@@ -122,6 +122,7 @@ int PPCHIRBuilder::Emit(FunctionInfo* symbol_info, uint32_t flags) {
       // TraceInvalidInstruction(i);
       continue;
     }
+    ++i.type->translation_count;
 
     typedef int (*InstrEmitter)(PPCHIRBuilder& f, InstrData& i);
     InstrEmitter emit = (InstrEmitter)i.type->emit;

src/alloy/frontend/ppc/ppc_instr.cc

@@ -10,14 +10,30 @@
 #include <alloy/frontend/ppc/ppc_instr.h>
 
 #include <sstream>
+#include <vector>
 
 #include <alloy/frontend/ppc/ppc_instr_tables.h>
+#include <alloy/string_buffer.h>
 #include <poly/poly.h>
 
 namespace alloy {
 namespace frontend {
 namespace ppc {
 
+std::vector<InstrType*> all_instrs_;
+
+void DumpAllInstrCounts() {
+  StringBuffer sb;
+  sb.Append("Instruction translation counts:\n");
+  for (auto instr_type : all_instrs_) {
+    if (instr_type->translation_count) {
+      sb.Append("%8d : %s\n", instr_type->translation_count, instr_type->name);
+    }
+  }
+  fprintf(stdout, sb.GetString());
+  fflush(stdout);
+}
+
 void InstrOperand::Dump(std::string& out_str) {
   if (display) {
     out_str += display;
@@ -322,48 +338,39 @@ InstrType* GetInstrType(uint32_t code) {
   switch (code >> 26) {
     case 4:
       // Opcode = 4, index = bits 10-0 (10)
-      slot =
-          alloy::frontend::ppc::tables::instr_table_4[select_bits(code, 0, 10)];
+      slot = tables::instr_table_4[select_bits(code, 0, 10)];
       break;
     case 19:
       // Opcode = 19, index = bits 10-1 (10)
-      slot = alloy::frontend::ppc::tables::instr_table_19[select_bits(code, 1,
-                                                                      10)];
+      slot = tables::instr_table_19[select_bits(code, 1, 10)];
       break;
     case 30:
       // Opcode = 30, index = bits 4-1 (4)
       // Special cased to an uber instruction.
-      slot =
-          alloy::frontend::ppc::tables::instr_table_30[select_bits(code, 0, 0)];
+      slot = tables::instr_table_30[select_bits(code, 0, 0)];
       break;
     case 31:
       // Opcode = 31, index = bits 10-1 (10)
-      slot = alloy::frontend::ppc::tables::instr_table_31[select_bits(code, 1,
-                                                                      10)];
+      slot = tables::instr_table_31[select_bits(code, 1, 10)];
       break;
     case 58:
       // Opcode = 58, index = bits 1-0 (2)
-      slot =
-          alloy::frontend::ppc::tables::instr_table_58[select_bits(code, 0, 1)];
+      slot = tables::instr_table_58[select_bits(code, 0, 1)];
       break;
     case 59:
       // Opcode = 59, index = bits 5-1 (5)
-      slot =
-          alloy::frontend::ppc::tables::instr_table_59[select_bits(code, 1, 5)];
+      slot = tables::instr_table_59[select_bits(code, 1, 5)];
       break;
     case 62:
       // Opcode = 62, index = bits 1-0 (2)
-      slot =
-          alloy::frontend::ppc::tables::instr_table_62[select_bits(code, 0, 1)];
+      slot = tables::instr_table_62[select_bits(code, 0, 1)];
       break;
     case 63:
       // Opcode = 63, index = bits 10-1 (10)
-      slot = alloy::frontend::ppc::tables::instr_table_63[select_bits(code, 1,
-                                                                      10)];
+      slot = tables::instr_table_63[select_bits(code, 1, 10)];
       break;
     default:
-      slot =
-          alloy::frontend::ppc::tables::instr_table[select_bits(code, 26, 31)];
+      slot = tables::instr_table[select_bits(code, 26, 31)];
       break;
   }
   if (slot && slot->opcode) {
@@ -372,9 +379,8 @@ InstrType* GetInstrType(uint32_t code) {
 
   // Slow lookup via linear scan.
   // This is primarily due to laziness. It could be made fast like the others.
-  for (size_t n = 0;
-       n < poly::countof(alloy::frontend::ppc::tables::instr_table_scan); n++) {
-    slot = &(alloy::frontend::ppc::tables::instr_table_scan[n]);
+  for (size_t n = 0; n < poly::countof(tables::instr_table_scan); n++) {
+    slot = &(tables::instr_table_scan[n]);
     if (slot->opcode == (code & slot->opcode_mask)) {
       return slot;
     }
@@ -389,6 +395,7 @@ int RegisterInstrEmit(uint32_t code, InstrEmitFn emit) {
   if (!instr_type) {
     return 1;
   }
+  all_instrs_.push_back(instr_type);
   assert_null(instr_type->emit);
   instr_type->emit = emit;
   return 0;

src/alloy/frontend/ppc/ppc_instr.h

@@ -561,10 +561,12 @@ class InstrType {
   uint32_t flags;        // xe_ppc_instr_flag_e
   InstrDisasmFn disasm;
   char name[16];
+  uint32_t translation_count;
 
   InstrEmitFn emit;
 };
 
+void DumpAllInstrCounts();
 InstrType* GetInstrType(uint32_t code);
 int RegisterInstrEmit(uint32_t code, InstrEmitFn emit);
 

src/alloy/frontend/ppc/ppc_instr_tables.h

@@ -127,7 +127,7 @@ static InstrType** instr_table_prep_63(InstrType* unprep, size_t unprep_count,
 #define INSTRUCTION(name, opcode, format, type, disasm_fn, descr)   \
   {                                                                 \
     opcode, 0, kXEPPCInstrFormat##format, kXEPPCInstrType##type, 0, \
-        Disasm_##disasm_fn, #name,                                  \
+        Disasm_##disasm_fn, #name, 0,                               \
   }
 #define FLAG(t) kXEPPCInstrFlag##t
 
@@ -844,7 +844,7 @@ static InstrType** instr_table = instr_table_prep(
 #define SCAN_INSTRUCTION(name, opcode, format, type, disasm_fn, descr) \
   {                                                                    \
     opcode, kXEPPCInstrMask##format, kXEPPCInstrFormat##format,        \
-        kXEPPCInstrType##type, 0, Disasm_##disasm_fn, #name,           \
+        kXEPPCInstrType##type, 0, Disasm_##disasm_fn, #name, 0,        \
   }
 #define OP(x) ((((uint32_t)(x)) & 0x3f) << 26)
 #define VX128(op, xop) (OP(op) | (((uint32_t)(xop)) & 0x3d0))

src/alloy/frontend/ppc/ppc_translator.cc

@@ -124,6 +124,10 @@ int PPCTranslator::Translate(FunctionInfo* symbol_info,
     string_buffer_.Reset();
   }
 
+  if (false) {
+    alloy::frontend::ppc::DumpAllInstrCounts();
+  }
+
   // Emit function.
   uint32_t emit_flags = 0;
   if (debug_info) {