diff --git a/pkgs/development/compilers/llvm/10/llvm/default.nix b/pkgs/development/compilers/llvm/10/llvm/default.nix
index 8a7b84c4eb1..93cdc7307da 100644
--- a/pkgs/development/compilers/llvm/10/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/10/llvm/default.nix
@@ -1,6 +1,7 @@
 { lib, stdenv, llvm_meta
 , pkgsBuildBuild
 , fetch
+, fetchpatch
 , cmake
 , python3
 , libffi
@@ -57,6 +58,13 @@ in stdenv.mkDerivation (rec {
 
   patches = [
     ./gnu-install-dirs.patch
+    # On older CPUs (e.g. Hydra/wendy) we'd be getting an error in this test.
+    (fetchpatch {
+      name = "uops-CMOV16rm-noreg.diff";
+      url = "https://github.com/llvm/llvm-project/commit/9e9f991ac033.diff";
+      sha256 = "sha256:12s8vr6ibri8b48h2z38f3afhwam10arfiqfy4yg37bmc054p5hi";
+      stripLen = 1;
+    })
   ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''
diff --git a/pkgs/development/compilers/llvm/11/llvm/default.nix b/pkgs/development/compilers/llvm/11/llvm/default.nix
index 3ade1ac4817..941a85e6ad0 100644
--- a/pkgs/development/compilers/llvm/11/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/11/llvm/default.nix
@@ -1,6 +1,7 @@
 { lib, stdenv, llvm_meta
 , pkgsBuildBuild
 , fetch
+, fetchpatch
 , cmake
 , python3
 , libffi
@@ -57,6 +58,13 @@ in stdenv.mkDerivation (rec {
 
   patches = [
     ./gnu-install-dirs.patch
+    # On older CPUs (e.g. Hydra/wendy) we'd be getting an error in this test.
+    (fetchpatch {
+      name = "uops-CMOV16rm-noreg.diff";
+      url = "https://github.com/llvm/llvm-project/commit/9e9f991ac033.diff";
+      sha256 = "sha256:12s8vr6ibri8b48h2z38f3afhwam10arfiqfy4yg37bmc054p5hi";
+      stripLen = 1;
+    })
   ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''
diff --git a/pkgs/development/compilers/llvm/12/llvm/default.nix b/pkgs/development/compilers/llvm/12/llvm/default.nix
index 2e5afc0d5e2..d2365745b98 100644
--- a/pkgs/development/compilers/llvm/12/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/12/llvm/default.nix
@@ -1,6 +1,7 @@
 { lib, stdenv, llvm_meta
 , pkgsBuildBuild
 , fetch
+, fetchpatch
 , cmake
 , python3
 , libffi
@@ -56,10 +57,14 @@ in stdenv.mkDerivation (rec {
   propagatedBuildInputs = [ ncurses zlib ];
 
   patches = [
-    # Force a test to evaluate the saved benchmark for a CPU for which LLVM has
-    # an execution model. See NixOS/nixpkgs#119673.
-    ../../exegesis-force-bdver2.patch
     ./gnu-install-dirs.patch
+    # On older CPUs (e.g. Hydra/wendy) we'd be getting an error in this test.
+    (fetchpatch {
+      name = "uops-CMOV16rm-noreg.diff";
+      url = "https://github.com/llvm/llvm-project/commit/9e9f991ac033.diff";
+      sha256 = "sha256:12s8vr6ibri8b48h2z38f3afhwam10arfiqfy4yg37bmc054p5hi";
+      stripLen = 1;
+    })
   ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''
diff --git a/pkgs/development/compilers/llvm/9/llvm/default.nix b/pkgs/development/compilers/llvm/9/llvm/default.nix
index 6b37460b8ab..cf064b75b3f 100644
--- a/pkgs/development/compilers/llvm/9/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/9/llvm/default.nix
@@ -57,6 +57,9 @@ in stdenv.mkDerivation (rec {
 
   patches = [
     ./gnu-install-dirs.patch
+    # Force a test to evaluate the saved benchmark for a CPU for which LLVM has
+    # an execution model. See NixOS/nixpkgs#119673.
+    ../../exegesis-force-bdver2.patch
   ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''