firedancer-io · topointon-jump · Nov 25, 2025
diff --git a/src/flamenco/features/fd_features_generated.c b/src/flamenco/features/fd_features_generated.c
@@ -1691,6 +1691,12 @@ fd_feature_id_t const ids[] = {
     .name                      = "poseidon_enforce_padding",
     .cleaned_up                = {UINT_MAX, UINT_MAX, UINT_MAX} },
 
+  { .index                     = offsetof(fd_features_t, increase_cpi_account_info_limit)>>3,
+    .id                        = {"\xef\x31\xcf\xa8\x88\x28\x79\x55\xd9\xb1\x72\x19\xda\x33\x5d\x8e\x8b\x8f\x5e\x3f\x41\x49\xe5\x9a\x94\x65\xa6\x44\xef\x9c\xa2\xf6"},
+                                 /* H6iVbVaDZgDphcPbcZwc5LoznMPWQfnJ1AM7L1xzqvt5 */
+    .name                      = "increase_cpi_account_info_limit",
+    .cleaned_up                = {UINT_MAX, UINT_MAX, UINT_MAX} },
+
   { .index = ULONG_MAX }
 };
 /* TODO replace this with fd_map_perfect */
@@ -1944,6 +1950,7 @@ fd_feature_id_query( ulong prefix ) {
   case 0x520c5e674243fab5: return &ids[ 244 ];
   case 0xf08a42c3c040e908: return &ids[ 245 ];
   case 0x8c7bee4552d93e0c: return &ids[ 246 ];
+  case 0x55792888a8cf31ef: return &ids[ 247 ];
   default: break;
   }
   return NULL;
@@ -2196,4 +2203,5 @@ FD_STATIC_ASSERT( offsetof( fd_features_t, stricter_abi_and_runtime_constraints
 FD_STATIC_ASSERT( offsetof( fd_features_t, account_data_direct_mapping                             )>>3==244UL, layout );
 FD_STATIC_ASSERT( offsetof( fd_features_t, fix_alt_bn128_pairing_length_check                      )>>3==245UL, layout );
 FD_STATIC_ASSERT( offsetof( fd_features_t, poseidon_enforce_padding                                )>>3==246UL, layout );
+FD_STATIC_ASSERT( offsetof( fd_features_t, increase_cpi_account_info_limit                         )>>3==247UL, layout );
 FD_STATIC_ASSERT( sizeof( fd_features_t )>>3==FD_FEATURE_ID_CNT, layout );
diff --git a/src/flamenco/features/fd_features_generated.h b/src/flamenco/features/fd_features_generated.h
@@ -8,10 +8,10 @@
 #endif
 
 /* FEATURE_ID_CNT is the number of features in ids */
-#define FD_FEATURE_ID_CNT (247UL)
+#define FD_FEATURE_ID_CNT (248UL)
 
 /* Feature set ID calculated from all feature names */
-#define FD_FEATURE_SET_ID (2146234083U)
+#define FD_FEATURE_SET_ID (3667030906U)
 
 union fd_features {
   ulong f[ FD_FEATURE_ID_CNT ];
@@ -263,5 +263,6 @@ union fd_features {
     /* 0x520c5e674243fab5 */ ulong account_data_direct_mapping;
     /* 0xf08a42c3c040e908 */ ulong fix_alt_bn128_pairing_length_check;
     /* 0x8c7bee4552d93e0c */ ulong poseidon_enforce_padding;
+    /* 0x55792888a8cf31ef */ ulong increase_cpi_account_info_limit;
   };
 };
diff --git a/src/flamenco/features/feature_map.json b/src/flamenco/features/feature_map.json
@@ -245,5 +245,6 @@
   {"name":"stricter_abi_and_runtime_constraints","pubkey":"sD3uVpaavUXQRvDXrMFCQ2CqLqnbz5mK8ttWNXbtD3r","old":"CxeBn9PVeeXbmjbNwLv6U4C6svNxnC4JX6mfkvgeMocM"},
   {"name":"account_data_direct_mapping","pubkey":"DFN8MyKpQqFW31qczcahgnnxcAHQc6P94wtTEX5EP1RA","old":"9s3RKimHWS44rJcJ9P1rwCmn2TvMqtZQBmz815ZUUHqJ"},
   {"name":"fix_alt_bn128_pairing_length_check","pubkey":"bnYzodLwmybj7e1HAe98yZrdJTd7we69eMMLgCXqKZm"},
-  {"name":"poseidon_enforce_padding","pubkey":"poUdAqRXXsNmfqAZ6UqpjbeYgwBygbfQLEvWSqVhSnb"}
+  {"name":"poseidon_enforce_padding","pubkey":"poUdAqRXXsNmfqAZ6UqpjbeYgwBygbfQLEvWSqVhSnb"},
+  {"name":"increase_cpi_account_info_limit","pubkey":"H6iVbVaDZgDphcPbcZwc5LoznMPWQfnJ1AM7L1xzqvt5"}
 ]
diff --git a/src/flamenco/vm/fd_vm_base.h b/src/flamenco/vm/fd_vm_base.h
@@ -196,10 +196,26 @@ FD_PROTOTYPES_END
 #define FD_VM_CREATE_PROGRAM_ADDRESS_UNITS              (            1500UL)
 
 /* FD_VM_INVOKE_UNITS is the number of compute units consumed by an
-   invoke call (not including the cost incurred by the called program) */
+   invoke call (not including the cost incurred by the called program)
+   https://github.com/anza-xyz/agave/blob/v3.1.2/program-runtime/src/execution_budget.rs#L20-L21 */
 
 #define FD_VM_INVOKE_UNITS                              (            1000UL)
 
+/* FD_VM_INVOKE_UNITS_SIMD_0339 is the number of compute units consumed by
+   an invoke call (not including the cost incurred by the called program)
+   with SIMD-0339 (increase_cpi_account_info_limit) active.
+   https://github.com/anza-xyz/agave/blob/v3.1.2/program-runtime/src/execution_budget.rs#L22-L23 */
+#define FD_VM_INVOKE_UNITS_SIMD_0339                    (             946UL)
+
+/* SIMD-0339 uses a fixed size (80 bytes) to bill each account info:
+   - 32 bytes for account address
+   - 32 bytes for owner address
+   - 8 bytes for lamports
+   - 8 bytes for data length
+   https://github.com/anza-xyz/agave/blob/v3.1.2/program-runtime/src/cpi.rs#L63-L68
+ */
+#define FD_VM_ACCOUNT_INFO_BYTE_SIZE                     (             80UL)
+
 /* FD_VM_MAX_INVOKE_STACK_HEIGHT is the maximum program instruction
    invocation stack height. Invocation stack height starts at 1 for
    transaction instructions and the stack height is incremented each

diff --git a/src/flamenco/vm/syscall/fd_vm_syscall_cpi.c b/src/flamenco/vm/syscall/fd_vm_syscall_cpi.c
@@ -239,13 +239,32 @@ fd_vm_prepare_instruction( fd_instr_info_t *        callee_instr,
    https://github.com/anza-xyz/agave/blob/838c1952595809a31520ff1603a13f2c9123aa51/programs/bpf_loader/src/syscalls/cpi.rs#L1011 */
 
 #define FD_CPI_MAX_ACCOUNT_INFOS           (128UL)
+#define FD_CPI_MAX_ACCOUNT_INFOS_SIMD_0339 (255UL)
+
 /* This is just encoding what Agave says in their code comments into a
    compile-time check, so if anyone ever inadvertently changes one of
    the limits, they will have to take a look. */
 FD_STATIC_ASSERT( FD_CPI_MAX_ACCOUNT_INFOS==MAX_TX_ACCOUNT_LOCKS, cpi_max_account_info );
+
+/* https://github.com/anza-xyz/agave/blob/v3.1.2/program-runtime/src/cpi.rs#L168-L180 */
 static inline ulong
 get_cpi_max_account_infos( fd_bank_t * bank ) {
-  return fd_ulong_if( FD_FEATURE_ACTIVE_BANK( bank, increase_tx_account_lock_limit ), FD_CPI_MAX_ACCOUNT_INFOS, 64UL );
+  if( FD_LIKELY( FD_FEATURE_ACTIVE_BANK( bank, increase_cpi_account_info_limit ) ) ) {
+    return FD_CPI_MAX_ACCOUNT_INFOS_SIMD_0339;
+  } else if( FD_LIKELY( FD_FEATURE_ACTIVE_BANK( bank, increase_tx_account_lock_limit ) ) ) {
+    return FD_CPI_MAX_ACCOUNT_INFOS;
+  } else {
+    return 64UL;
+  }
+}
+
+/* https://github.com/anza-xyz/agave/blob/v3.1.2/program-runtime/src/execution_budget.rs#L25-L31 */
+static inline ulong
+get_cpi_invoke_unit_cost( fd_bank_t * bank ) {
+  return fd_ulong_if(
+    FD_FEATURE_ACTIVE_BANK( bank, increase_cpi_account_info_limit ),
+    FD_VM_INVOKE_UNITS_SIMD_0339,
+    FD_VM_INVOKE_UNITS );
 }
 
 /* Maximum CPI instruction data size. 10 KiB was chosen to ensure that CPI

diff --git a/src/flamenco/vm/syscall/fd_vm_syscall_cpi_common.c b/src/flamenco/vm/syscall/fd_vm_syscall_cpi_common.c
@@ -677,7 +677,8 @@ VM_SYSCALL_CPI_ENTRYPOINT( void *  _vm,
 
   fd_vm_t * vm = (fd_vm_t *)_vm;
 
-  FD_VM_CU_UPDATE( vm, FD_VM_INVOKE_UNITS );
+  /* https://github.com/anza-xyz/agave/blob/v3.1.2/program-runtime/src/cpi.rs#L815-L818 */
+  FD_VM_CU_UPDATE( vm, get_cpi_invoke_unit_cost( vm->instr_ctx->bank ) );
 
   /* Translate instruction ********************************************/
   /* translate_instruction is the first thing that agave does
@@ -718,7 +719,20 @@ VM_SYSCALL_CPI_ENTRYPOINT( void *  _vm,
   /* Agave consumes CU in translate_instruction
      https://github.com/anza-xyz/agave/blob/838c1952595809a31520ff1603a13f2c9123aa51/programs/bpf_loader/src/syscalls/cpi.rs#L445 */
   if( FD_FEATURE_ACTIVE_BANK( vm->instr_ctx->bank, loosen_cpi_size_restriction ) ) {
-    FD_VM_CU_UPDATE( vm, VM_SYSCALL_CPI_INSTR_DATA_LEN( cpi_instruction ) / FD_VM_CPI_BYTES_PER_UNIT );
+    ulong total_cu_translation_cost = VM_SYSCALL_CPI_INSTR_DATA_LEN( cpi_instruction ) / FD_VM_CPI_BYTES_PER_UNIT;
+
+    /* https://github.com/anza-xyz/agave/blob/v3.1.2/program-runtime/src/cpi.rs#L686-L699 */
+    if( FD_FEATURE_ACTIVE_BANK( vm->instr_ctx->bank, increase_cpi_account_info_limit ) ) {
+      /* Agave bills the same regardless of ABI */
+      ulong account_meta_translation_cost =
+        fd_ulong_sat_mul(
+          VM_SYSCALL_CPI_INSTR_ACCS_LEN( cpi_instruction ),
+          FD_VM_RUST_ACCOUNT_META_SIZE ) /
+        FD_VM_CPI_BYTES_PER_UNIT;
+      total_cu_translation_cost = fd_ulong_sat_add( total_cu_translation_cost, account_meta_translation_cost );
+    }
+
+    FD_VM_CU_UPDATE( vm, total_cu_translation_cost );
   }
 
   /* Final checks for translate_instruction
@@ -833,7 +847,15 @@ VM_SYSCALL_CPI_ENTRYPOINT( void *  _vm,
     return FD_VM_SYSCALL_ERR_MAX_INSTRUCTION_ACCOUNT_INFOS_EXCEEDED;
   }
 
-  fd_pubkey_t const * acct_info_keys[ FD_CPI_MAX_ACCOUNT_INFOS ];
+  /* Consume compute units proportional to the number of account infos, if
+     increase_cpi_account_info_limit is active.
+     https://github.com/anza-xyz/agave/blob/v3.1.2/program-runtime/src/cpi.rs#L968-L980 */
+  if( FD_FEATURE_ACTIVE_BANK( vm->instr_ctx->bank, increase_cpi_account_info_limit ) ) {
+    ulong account_infos_bytes = fd_ulong_sat_mul( acct_info_cnt, VM_SYSCALL_CPI_ACC_INFO_SIZE );
+    FD_VM_CU_UPDATE( vm, account_infos_bytes / FD_VM_CPI_BYTES_PER_UNIT );
+  }
+
+  fd_pubkey_t const * acct_info_keys[ FD_CPI_MAX_ACCOUNT_INFOS_SIMD_0339 ];
   for( ulong acct_idx = 0UL; acct_idx < acct_info_cnt; acct_idx++ ) {
     /* Translate each pubkey address specified in account_infos.
        Failed translation should lead to an access violation and

diff --git a/src/flamenco/vm/test_vm_base.c b/src/flamenco/vm/test_vm_base.c
@@ -51,6 +51,7 @@ FD_STATIC_ASSERT( FD_VM_COMPUTE_UNIT_LIMIT                       ==         1400
 FD_STATIC_ASSERT( FD_VM_LOG_64_UNITS                             ==             100UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_CREATE_PROGRAM_ADDRESS_UNITS             ==            1500UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_INVOKE_UNITS                             ==            1000UL, vm_cu );
+FD_STATIC_ASSERT( FD_VM_INVOKE_UNITS_SIMD_0339                   ==             946UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_MAX_INVOKE_STACK_HEIGHT                  ==               5UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_MAX_INSTRUCTION_TRACE_LENGTH             ==              64UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_SHA256_BASE_COST                         ==              85UL, vm_cu );
@@ -60,6 +61,7 @@ FD_STATIC_ASSERT( FD_VM_MAX_CALL_DEPTH                           ==
 FD_STATIC_ASSERT( FD_VM_STACK_FRAME_SIZE                         ==            4096UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_LOG_PUBKEY_UNITS                         ==             100UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_MAX_CPI_INSTRUCTION_SIZE                 ==            1280UL, vm_cu );
+FD_STATIC_ASSERT( FD_VM_ACCOUNT_INFO_BYTE_SIZE                   ==              80UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_CPI_BYTES_PER_UNIT                       ==             250UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_SYSVAR_BASE_COST                         ==             100UL, vm_cu );
 FD_STATIC_ASSERT( FD_VM_SECP256K1_RECOVER_COST                   ==           25000UL, vm_cu );