[mini] Use an atomic add for the code coverage counter when possible.

diff --git a/mono/mini/method-to-ir.c b/mono/mini/method-to-ir.c
index c802e82394c49be55a0eea08c4524452dec134b2..a32facdf78d454cb188396ca0e8030804cfab5de 100644 (file)
--- a/mono/mini/method-to-ir.c
+++ b/mono/mini/method-to-ir.c
@@ -7701,18 +7701,25 @@ mono_method_to_ir (MonoCompile *cfg, MonoMethod *method, MonoBasicBlock *start_b
 
                if ((cfg->method == method) && cfg->coverage_info) {
                        guint32 cil_offset = ip - header->code;
+                       gpointer counter = &cfg->coverage_info->data [cil_offset].count;
                        cfg->coverage_info->data [cil_offset].cil_code = ip;
 
-                       /* TODO: Use an increment here */
-#if defined(TARGET_X86)
-                       MONO_INST_NEW (cfg, ins, OP_STORE_MEM_IMM);
-                       ins->inst_p0 = &(cfg->coverage_info->data [cil_offset].count);
-                       ins->inst_imm = 1;
-                       MONO_ADD_INS (cfg->cbb, ins);
-#else
-                       EMIT_NEW_PCONST (cfg, ins, &(cfg->coverage_info->data [cil_offset].count));
-                       MONO_EMIT_NEW_STORE_MEMBASE_IMM (cfg, OP_STORE_MEMBASE_IMM, ins->dreg, 0, 1);
-#endif
+                       if (mono_arch_opcode_supported (OP_ATOMIC_ADD_I4)) {
+                               MonoInst *one_ins, *load_ins;
+
+                               EMIT_NEW_PCONST (cfg, load_ins, counter);
+                               EMIT_NEW_ICONST (cfg, one_ins, 1);
+                               MONO_INST_NEW (cfg, ins, OP_ATOMIC_ADD_I4);
+                               ins->dreg = mono_alloc_ireg (cfg);
+                               ins->inst_basereg = load_ins->dreg;
+                               ins->inst_offset = 0;
+                               ins->sreg2 = one_ins->dreg;
+                               ins->type = STACK_I4;
+                               MONO_ADD_INS (cfg->cbb, ins);
+                       } else {
+                               EMIT_NEW_PCONST (cfg, ins, counter);
+                               MONO_EMIT_NEW_STORE_MEMBASE_IMM (cfg, OP_STORE_MEMBASE_IMM, ins->dreg, 0, 1);
+                       }
                }
 
                if (cfg->verbose_level > 3)