From 87bbfbfe7ad08286b78bd37a65b0e7750a4e7aca Mon Sep 17 00:00:00 2001
From: Jayant Krishnamurthy <jkrishnamurthy@jumptrading.com>
Date: Tue, 28 Jun 2022 12:46:19 -0700
Subject: [PATCH] Check exponent range

---
 program/src/oracle/oracle.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/program/src/oracle/oracle.h b/program/src/oracle/oracle.h
index 80591c905..d17960a90 100644
--- a/program/src/oracle/oracle.h
+++ b/program/src/oracle/oracle.h
@@ -20,7 +20,9 @@ extern "C" {
 #define PC_PUBKEY_SIZE_64   (PC_PUBKEY_SIZE/sizeof(uint64_t))
 #define PC_MAP_TABLE_SIZE   640
 #define PC_COMP_SIZE         32
-#define PC_MAX_NUM_DECIMALS  16
+// Bound on the range of the exponent in price accounts. This number is set such that the
+// PD-based EMA computation does not lose too much precision.
+#define PC_MAX_NUM_DECIMALS   8
 #define PC_PROD_ACC_SIZE    512
 #define PC_EXP_DECAY         -9
 // If ci > price / PC_MAX_CI_DIVISOR, set publisher status to unknown.