From 445b11148fc29883eed51d5fe40f7a89187179bb Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Thu, 12 Feb 2026 00:10:26 +0100
Subject: [PATCH] work around llvm failing to compile the AVX512 sgemm kernel

---
 Makefile.x86_64 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefile.x86_64 b/Makefile.x86_64
index e9831327fe..60edc06d3a 100644
--- a/Makefile.x86_64
+++ b/Makefile.x86_64
@@ -61,6 +61,9 @@ endif
 ifeq ($(CORE), SKYLAKEX)
 ifndef NO_AVX512
 CCOMMON_OPT += -march=skylake-avx512
+ifeq ($(C_COMPILER, CLANG)
+CCOMMON_OPT += -mllvm -exhaustive-register-search
+endif
 ifneq ($(F_COMPILER), NAG)
 FCOMMON_OPT += -march=skylake-avx512
 endif
@@ -93,6 +96,7 @@ ifeq ($(C_COMPILER), GCC)
   endif
  endif
 else ifeq ($(C_COMPILER), CLANG)
+ CCOMMON_OPT += -mllvm -exhaustive-register-search
  # cooperlake support was added in clang 9
  ifeq ($(CLANGVERSIONGTEQ9), 1)
   CCOMMON_OPT += -march=cooperlake
@@ -135,6 +139,7 @@ ifeq ($(C_COMPILER), GCC)
   endif
  endif
 else ifeq ($(C_COMPILER), CLANG)
+  CCOMMON_OPT += -mllvm -exhaustive-register-search
  # sapphire rapids support was added in clang 12
  ifeq ($(CLANGVERSIONGTEQ12), 1)
   CCOMMON_OPT += -march=sapphirerapids