[libspike] add "disable NaN normalization" patch

nix/patches/spike/0001-enforce-lanewise-order-for-unordered-reduce.patch

@@ -1,7 +1,7 @@
 From 0ad6da899c20df0ce6120bc4ebd32edf01bdcd36 Mon Sep 17 00:00:00 2001
 From: SharzyL <[email protected]>
 Date: Sun, 25 Feb 2024 01:28:18 +0800
-Subject: [PATCH] enforce lanewise order for unordered reduce
+Subject: [PATCH 1/2] enforce lanewise order for unordered reduce
 
 ---
  riscv/insns/vfredusum_vs.h |  2 +-

nix/patches/spike/0002-disable-NaN-normalization.patch

@@ -0,0 +1,43 @@
+From 09a503dc94382798a1ee2f23b4b6894a12bc8207 Mon Sep 17 00:00:00 2001
+From: SharzyL <[email protected]>
+Date: Mon, 26 Aug 2024 20:08:47 +0800
+Subject: [PATCH 2/2] disable NaN normalization
+
+---
+ riscv/v_ext_macros.h | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/riscv/v_ext_macros.h b/riscv/v_ext_macros.h
+index e5ea1045..202fde9c 100644
+--- a/riscv/v_ext_macros.h
++++ b/riscv/v_ext_macros.h
+@@ -1518,7 +1518,7 @@ reg_t index[P.VU.vlmax]; \
+                 softfloat_exceptionFlags |= softfloat_flag_invalid; \
+                 set_fp_exceptions; \
+               } \
+-              P.VU.elt<uint16_t>(rd_num, 0, true) = defaultNaNF16UI; \
++              P.VU.elt<uint16_t>(rd_num, 0, true) = vd_0.v; \
+             } else { \
+               P.VU.elt<uint16_t>(rd_num, 0, true) = vd_0.v; \
+             } \
+@@ -1531,7 +1531,7 @@ reg_t index[P.VU.vlmax]; \
+                 softfloat_exceptionFlags |= softfloat_flag_invalid; \
+                 set_fp_exceptions; \
+               } \
+-              P.VU.elt<uint32_t>(rd_num, 0, true) = defaultNaNF32UI; \
++              P.VU.elt<uint32_t>(rd_num, 0, true) = vd_0.v; \
+             } else { \
+               P.VU.elt<uint32_t>(rd_num, 0, true) = vd_0.v; \
+             } \
+@@ -1544,7 +1544,7 @@ reg_t index[P.VU.vlmax]; \
+                 softfloat_exceptionFlags |= softfloat_flag_invalid; \
+                 set_fp_exceptions; \
+               } \
+-              P.VU.elt<uint64_t>(rd_num, 0, true) = defaultNaNF64UI; \
++              P.VU.elt<uint64_t>(rd_num, 0, true) = vd_0.v; \
+             } else { \
+               P.VU.elt<uint64_t>(rd_num, 0, true) = vd_0.v; \
+             } \
+-- 
+2.43.0
+

nix/pkgs/libspike.nix

@@ -28,7 +28,10 @@ stdenv.mkDerivation {
     "--enable-commitlog"
   ];
 
-  patches = [ ../patches/spike/0001-enforce-lanewise-order-for-unordered-reduce.patch ];
+  patches = [
+    ../patches/spike/0001-enforce-lanewise-order-for-unordered-reduce.patch
+    ../patches/spike/0002-disable-NaN-normalization.patch
+  ];
 
   installPhase = ''
     runHook preInstall