firedancer-io · topointon-jump · Dec 15, 2025
diff --git a/src/flamenco/features/fd_features.h b/src/flamenco/features/fd_features.h
@@ -29,6 +29,7 @@
 #define FD_FEATURE_ACTIVE(_slot, _features, _feature_name)                FD_FEATURE_ACTIVE_( _slot, _features, _feature_name )
 #define FD_FEATURE_ACTIVE_BANK(_bank, _feature_name)                      FD_FEATURE_ACTIVE_( fd_bank_slot_get( _bank ), fd_bank_features_query( _bank ), _feature_name )
 #define FD_FEATURE_ACTIVE_BANK_OFFSET(_bank, _offset)                     FD_FEATURE_ACTIVE_OFFSET_( fd_bank_slot_get( _bank ), fd_bank_features_query( _bank ), _offset )
+#define FD_FEATURE_JUST_ACTIVATED_BANK(_bank, _feature_name)              FD_FEATURE_JUST_ACTIVATED_( fd_bank_slot_get( _bank ), fd_bank_features_query( _bank ), _feature_name )
 
 
 /* fd_features_t is the current set of enabled feature flags.

diff --git a/src/flamenco/features/fd_features_generated.c b/src/flamenco/features/fd_features_generated.c
@@ -1715,6 +1715,12 @@ fd_feature_id_t const ids[] = {
     .name                      = "increase_cpi_account_info_limit",
     .cleaned_up                = {UINT_MAX, UINT_MAX, UINT_MAX} },
 
+  { .index                     = offsetof(fd_features_t, deprecate_rent_exemption_threshold)>>3,
+    .id                        = {"\x0c\xb8\x30\xab\xeb\x2f\x79\xf4\x53\xf9\xb1\x27\x15\xb8\x75\x56\xc4\x82\x1a\x67\xe0\x03\xa8\x07\x5e\x13\xa7\x58\xdd\xf7\xa2\x1d"},
+                                 /* rent6iVy6PDoViPBeJ6k5EJQrkj62h7DPyLbWGHwjrC */
+    .name                      = "deprecate_rent_exemption_threshold",
+    .cleaned_up                = {UINT_MAX, UINT_MAX, UINT_MAX} },
+
   { .index = ULONG_MAX }
 };
 /* TODO replace this with fd_map_perfect */
@@ -1972,6 +1978,7 @@ fd_feature_id_query( ulong prefix ) {
   case 0x7c4802b8ba3fa849: return &ids[ 248 ];
   case 0xab2a2311ca83eb09: return &ids[ 249 ];
   case 0x55792888a8cf31ef: return &ids[ 250 ];
+  case 0xf4792febab30b80c: return &ids[ 251 ];
   default: break;
   }
   return NULL;
@@ -2228,4 +2235,5 @@ FD_STATIC_ASSERT( offsetof( fd_features_t, relax_intrabatch_account_locks
 FD_STATIC_ASSERT( offsetof( fd_features_t, provide_instruction_data_offset_in_vm_r2                )>>3==248UL, layout );
 FD_STATIC_ASSERT( offsetof( fd_features_t, enforce_fixed_fec_set                                   )>>3==249UL, layout );
 FD_STATIC_ASSERT( offsetof( fd_features_t, increase_cpi_account_info_limit                         )>>3==250UL, layout );
+FD_STATIC_ASSERT( offsetof( fd_features_t, deprecate_rent_exemption_threshold                      )>>3==251UL, 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 (251UL)
+#define FD_FEATURE_ID_CNT (252UL)
 
 /* Feature set ID calculated from all feature names */
-#define FD_FEATURE_SET_ID (1776864602U)
+#define FD_FEATURE_SET_ID (2346311975U)
 
 union fd_features {
   ulong f[ FD_FEATURE_ID_CNT ];
@@ -267,5 +267,6 @@ union fd_features {
     /* 0x7c4802b8ba3fa849 */ ulong provide_instruction_data_offset_in_vm_r2;
     /* 0xab2a2311ca83eb09 */ ulong enforce_fixed_fec_set;
     /* 0x55792888a8cf31ef */ ulong increase_cpi_account_info_limit;
+    /* 0xf4792febab30b80c */ ulong deprecate_rent_exemption_threshold;
   };
 };
diff --git a/src/flamenco/features/feature_map.json b/src/flamenco/features/feature_map.json
@@ -249,5 +249,6 @@
   {"name":"relax_intrabatch_account_locks","pubkey":"ENTRYnPAoT5Swwx73YDGzMp3XnNH1kxacyvLosRHza1i"},
   {"name":"provide_instruction_data_offset_in_vm_r2","pubkey":"5xXZc66h4UdB6Yq7FzdBxBiRAFMMScMLwHxk2QZDaNZL"},
   {"name":"enforce_fixed_fec_set","pubkey":"fixfecLZYMfkGzwq6NJA11Yw6KYztzXiK9QcL3K78in"},
-  {"name":"increase_cpi_account_info_limit","pubkey":"H6iVbVaDZgDphcPbcZwc5LoznMPWQfnJ1AM7L1xzqvt5"}
+  {"name":"increase_cpi_account_info_limit","pubkey":"H6iVbVaDZgDphcPbcZwc5LoznMPWQfnJ1AM7L1xzqvt5"},
+  {"name":"deprecate_rent_exemption_threshold","pubkey":"rent6iVy6PDoViPBeJ6k5EJQrkj62h7DPyLbWGHwjrC"}
 ]
diff --git a/src/flamenco/runtime/Local.mk b/src/flamenco/runtime/Local.mk
@@ -66,6 +66,12 @@ ifdef FD_HAS_ATOMIC
 ifdef FD_HAS_INT128
 $(call add-hdrs,fd_runtime.h fd_runtime_err.h fd_runtime_const.h fd_runtime_stack.h fd_runtime_helpers.h)
 $(call add-objs,fd_runtime,fd_flamenco)
+ifdef FD_HAS_HOSTED
+ifdef FD_HAS_SECP256K1
+$(call make-unit-test,test_deprecate_rent_exemption_threshold,test_deprecate_rent_exemption_threshold,fd_flamenco fd_funk fd_ballet fd_util)
+$(call run-unit-test,test_deprecate_rent_exemption_threshold,)
+endif
+endif
 endif
 endif
 

diff --git a/src/flamenco/runtime/fd_runtime.c b/src/flamenco/runtime/fd_runtime.c
@@ -1,5 +1,6 @@
 #include "fd_runtime.h"
 #include "../capture/fd_capture_ctx.h"
+#include "../types/fd_cast.h"
 #include "fd_acc_mgr.h"
 #include "fd_alut_interp.h"
 #include "fd_bank.h"
@@ -560,6 +561,29 @@ fd_features_activate( fd_bank_t *               bank,
   }
 }
 
+/* SIMD-0194: deprecate_rent_exemption_threshold
+   https://github.com/anza-xyz/agave/blob/v3.1.4/runtime/src/bank.rs#L5322-L5329 */
+static void
+deprecate_rent_exemption_threshold( fd_bank_t *               bank,
+                                    fd_accdb_user_t *         accdb,
+                                    fd_funk_txn_xid_t const * xid,
+                                    fd_capture_ctx_t *        capture_ctx,
+                                    fd_funk_t *               funk ) {
+  fd_rent_t rent[1] = {0};
+  if( FD_UNLIKELY( !fd_sysvar_rent_read( funk, xid, rent ) ) ) {
+    FD_LOG_CRIT(( "fd_sysvar_rent_read failed" ));
+  }
+  rent->lamports_per_uint8_year = fd_rust_cast_double_to_ulong(
+    (double)rent->lamports_per_uint8_year * rent->exemption_threshold );
+  rent->exemption_threshold     = FD_SIMD_0194_NEW_RENT_EXEMPTION_THRESHOLD;
+
+  /* We don't refresh the sysvar cache here. The cache is refreshed in
+     fd_sysvar_cache_restore, which is called at the start of every block
+     in fd_runtime_block_execute_prepare, after this function. */
+  fd_sysvar_rent_write( bank, accdb, xid, capture_ctx, rent );
+  fd_bank_rent_set( bank, *rent );
+}
+
 /* Starting a new epoch.
   New epoch:        T
   Just ended epoch: T-1
@@ -604,6 +628,10 @@ fd_runtime_process_new_epoch( fd_banks_t *              banks,
   fd_features_activate( bank, accdb, xid, capture_ctx );
   fd_features_restore( bank, funk, xid );
 
+  if( FD_UNLIKELY( FD_FEATURE_JUST_ACTIVATED_BANK( bank, deprecate_rent_exemption_threshold ) ) ) {
+    deprecate_rent_exemption_threshold( bank, accdb, xid, capture_ctx, funk );
+  }
+
   /* Apply builtin program feature transitions
      https://github.com/anza-xyz/agave/blob/v2.1.0/runtime/src/bank.rs#L6621-L6624 */
 

diff --git a/src/flamenco/runtime/sysvar/fd_sysvar_rent.h b/src/flamenco/runtime/sysvar/fd_sysvar_rent.h
@@ -5,6 +5,10 @@
 #include "../../accdb/fd_accdb_user.h"
 #include "../../types/fd_types.h"
 
+/* SIMD-0194: deprecate_rent_exemption_threshold
+   https://github.com/anza-xyz/agave/blob/v3.1.4/runtime/src/bank.rs#L5322-L5329 */
+#define FD_SIMD_0194_NEW_RENT_EXEMPTION_THRESHOLD (1.0)
+
 FD_PROTOTYPES_BEGIN
 
 /* fd_sysvar_rent_init copies the cached rent sysvar stored from