diff --git a/srcpkgs/llvm19/patches/llvm-007-constantfolding-null-tli-fp128.patch b/srcpkgs/llvm19/patches/llvm-007-constantfolding-null-tli-fp128.patch
new file mode 100644
index 00000000000000..3e9ec8ca4db77d
--- /dev/null
+++ b/srcpkgs/llvm19/patches/llvm-007-constantfolding-null-tli-fp128.patch
@@ -0,0 +1,17 @@
+Backport of upstream commit 83a5c7cb62e404a713a35445b755cf0109650279
+"[ConstantFolding] Ensure TLI is valid when simplifying fp128 intrinsics"
+
+The inliner's cost analysis calls ConstantFoldCall without a TargetLibraryInfo.
+When the host build has logf128, the fp128 folding path dereferences TLI and segfaults.
+
+--- a/llvm/lib/Analysis/ConstantFolding.cpp
++++ b/llvm/lib/Analysis/ConstantFolding.cpp
+@@ -2124,7 +2124,7 @@
+       }
+ 
+       LibFunc Fp128Func = NotLibFunc;
+-      if (TLI->getLibFunc(Name, Fp128Func) && TLI->has(Fp128Func) &&
++      if (TLI && TLI->getLibFunc(Name, Fp128Func) && TLI->has(Fp128Func) &&
+           Fp128Func == LibFunc_logl)
+         return ConstantFoldFP128(logf128, Op->getValueAPF(), Ty);
+     }
diff --git a/srcpkgs/llvm19/template b/srcpkgs/llvm19/template
index 503b6e9dc52e5d..03080a1634c18e 100644
--- a/srcpkgs/llvm19/template
+++ b/srcpkgs/llvm19/template
@@ -1,7 +1,7 @@
 # Template file for 'llvm19'
 pkgname=llvm19
 version=19.1.4
-revision=8
+revision=9
 build_wrksrc=llvm
 build_style=cmake
 _llvm_prefix=lib/llvm/19