Fill in unreachable state in cvfpu.

Address ELAB-1094

Change-Id: Iea6bc593f8e02f8df0a86f5f2fb121000d3e79b2

rules/repos.bzl

diff --git a/rules/repos.bzl b/rules/repos.bzl
index a11e079..64cb1c0 100644
--- a/rules/repos.bzl
+++ b/rules/repos.bzl
@@ -127,6 +127,7 @@
         patches = [
             "@kelvin_hw//third_party/cvfpu:0001-Fix-max_num_lanes-issue-in-DC.patch",
             "@kelvin_hw//third_party/cvfpu:0002-Remove-SVH-includes.patch",
+            "@kelvin_hw//third_party/cvfpu:0003-Fill-in-unreachable-state-in-fpnew_divsqrt_th_32-fsm.patch",
         ],
         patch_args = ["-p1"],
     )

third_party/cvfpu/0003-Fill-in-unreachable-state-in-fpnew_divsqrt_th_32-fsm.patch

diff --git a/third_party/cvfpu/0003-Fill-in-unreachable-state-in-fpnew_divsqrt_th_32-fsm.patch b/third_party/cvfpu/0003-Fill-in-unreachable-state-in-fpnew_divsqrt_th_32-fsm.patch
new file mode 100644
index 0000000..9068ba0
--- /dev/null
+++ b/third_party/cvfpu/0003-Fill-in-unreachable-state-in-fpnew_divsqrt_th_32-fsm.patch
@@ -0,0 +1,25 @@
+From 85d0d9d9e69b54c9d324f4e059d1ab5cbea43952 Mon Sep 17 00:00:00 2001
+From: Derek Chow <derekjchow@google.com>
+Date: Fri, 1 Aug 2025 10:32:22 -0700
+Subject: [PATCH 3/3] Fill in unreachable state in fpnew_divsqrt_th_32 fsm.
+
+---
+ src/fpnew_divsqrt_th_32.sv | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/fpnew_divsqrt_th_32.sv b/src/fpnew_divsqrt_th_32.sv
+index a74e7e6..0cae2a3 100644
+--- a/src/fpnew_divsqrt_th_32.sv
++++ b/src/fpnew_divsqrt_th_32.sv
+@@ -143,7 +143,7 @@ module fpnew_divsqrt_th_32 #(
+   logic data_is_held;           // data in hold register is valid
+   logic unit_busy;              // valid data in flight
+   // FSM states
+-  typedef enum logic [1:0] {IDLE, BUSY, HOLD} fsm_state_e;
++  typedef enum logic [1:0] {IDLE, BUSY, HOLD, UNREACHABLE} fsm_state_e;
+   fsm_state_e state_q, state_d;
+ 
+   // Operations are gated by the FSM ready. Invalid input ops run a sqrt to not lose illegal instr.
+-- 
+2.50.1.565.gc32cd1483b-goog
+