From f263078e24f2e66264a1913ff4d71393a82d76b8 Mon Sep 17 00:00:00 2001
From: Luna Nova <git@lunnova.dev>
Date: Wed, 8 Oct 2025 08:16:12 -0700
Subject: [PATCH] rocmPackages.hipblaslt: stop inlining war and peace in asm
 comments

Reduces peak build dir usage to 150G

hipblaslt was filling the build tmpfs, peaking at 240G in the
build/Tensile/build_tmp/TENSILEdir

with this bodge we stop it from writing very verbose comments in
the generated assembly kernels

example excessive whitespace/comment content:
s_nop 0                                            // 1 wait state required when next inst writes vgprs held by previous dwordx4 store inst
---
 .../rocm-modules/6/hipblaslt/default.nix      |  3 ++
 .../6/hipblaslt/reduce-comment-spam.patch     | 47 +++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 pkgs/development/rocm-modules/6/hipblaslt/reduce-comment-spam.patch

diff --git a/pkgs/development/rocm-modules/6/hipblaslt/default.nix b/pkgs/development/rocm-modules/6/hipblaslt/default.nix
index 47bfd00909fc9..effc0c2f97c3a 100644
--- a/pkgs/development/rocm-modules/6/hipblaslt/default.nix
+++ b/pkgs/development/rocm-modules/6/hipblaslt/default.nix
@@ -111,6 +111,9 @@ stdenv.mkDerivation (finalAttrs: {
     # Support loading zstd compressed .dat files, required to keep output under
     # hydra size limit
     ./messagepack-compression-support.patch
+    # excessive comments are written to temporary asm files in build dir
+    # TODO: report upstream, find a better solution
+    ./reduce-comment-spam.patch
   ];
 
   postPatch = ''
diff --git a/pkgs/development/rocm-modules/6/hipblaslt/reduce-comment-spam.patch b/pkgs/development/rocm-modules/6/hipblaslt/reduce-comment-spam.patch
new file mode 100644
index 0000000000000..32969c5177810
--- /dev/null
+++ b/pkgs/development/rocm-modules/6/hipblaslt/reduce-comment-spam.patch
@@ -0,0 +1,47 @@
+diff --git a/projects/hipblaslt/tensilelite/rocisa/rocisa/include/format.hpp b/projects/hipblaslt/tensilelite/rocisa/rocisa/include/format.hpp
+index b7dcb6f59a..b0625ba769 100644
+--- a/tensilelite/rocisa/rocisa/include/format.hpp
++++ b/tensilelite/rocisa/rocisa/include/format.hpp
+@@ -8,11 +8,13 @@ namespace rocisa
+     // Text format functions
+     inline std::string slash(const std::string& comment)
+     {
++        return "";
+         return "// " + comment + "\n";
+     }
+ 
+     inline std::string slash50(const std::string& comment)
+     {
++        return "";
+         std::ostringstream oss;
+         oss << std::setw(50) << ""
+             << " // " << comment << "\n";
+@@ -21,16 +23,19 @@ namespace rocisa
+ 
+     inline std::string block(const std::string& comment)
+     {
++        return "";
+         return "/* " + comment + " */\n";
+     }
+ 
+     inline std::string blockNewLine(const std::string& comment)
+     {
++        return "";
+         return "\n/* " + comment + " */\n";
+     }
+ 
+     inline std::string block3Line(const std::string& comment)
+     {
++        return "";
+         std::ostringstream oss;
+         oss << "\n/******************************************/\n";
+         std::istringstream iss(comment);
+@@ -52,7 +57,7 @@ namespace rocisa
+         {
+             formattedStr = "\"" + formattedStr + "\\n\\t\"";
+         }
+-        if(!comment.empty())
++        if(false)
+         {
+             std::string buffer = formattedStr
+                                  + std::string(std::max(0, 50 - int(formattedStr.length())), ' ')