From cfede152c824aaf77e5abd75c804cb1553358478 Mon Sep 17 00:00:00 2001
From: Ophestra <cat@gensokyo.uk>
Date: Tue, 25 Aug 2026 16:27:05 +0900
Subject: internal/rosa/package/go: added PMULL gate on carryless multiply test

Fixes go.dev/issues/80991.

Signed-off-by: Ophestra <cat@gensokyo.uk>
---
 internal/rosa/package/go.az           | 57 ----------------------------------
 internal/rosa/package/go/820480.patch | 24 +++++++++++++++
 internal/rosa/package/go/package.az   | 58 +++++++++++++++++++++++++++++++++++
 3 files changed, 82 insertions(+), 57 deletions(-)
 delete mode 100644 internal/rosa/package/go.az
 create mode 100644 internal/rosa/package/go/820480.patch
 create mode 100644 internal/rosa/package/go/package.az

diff --git a/internal/rosa/package/go.az b/internal/rosa/package/go.az
deleted file mode 100644
index 096bb2fb..00000000
--- a/internal/rosa/package/go.az
+++ /dev/null
@@ -1,57 +0,0 @@
-package go {
-	description = "the Go programming language toolchain";
-	website = "https://go.dev";
-	anitya = 1227;
-
-	version# = "1.27.0";
-	source = remoteTar {
-		url = "https://go.dev/dl/go"+version+".src.tar.gz";
-		checksum = "Ookl2vP6KMfJuxaxX6nXZ1gnL43wZPl5GjpVsrI7IJiB4b3xr1PbnbYIOJ8v5jzG";
-		compress = gzip;
-	};
-
-	env = [
-		"CC=cc",
-		"GOCACHE=/tmp/gocache",
-		"GOROOT_BOOTSTRAP=/system/go",
-		"TMPDIR=/dev/shm/go",
-	];
-
-	enterSource = true;
-
-	exec = generic {
-		chdir = false;
-		build = `
-mkdir /work/system/ "${TMPDIR}"
-cp -r . /work/system/go
-cd /work/system/go/src/
-chmod -R +w ..
-
-sed -i \
-	's,/lib/ld-musl-`+linuxArch+`.so.1,/system/bin/linker,' \
-	cmd/link/internal/`+arch+`/obj.go
-
-rm \
-	os/root_unix_test.go \
-	runtime/crash_cgo_test.go \
-	cmd/cgo/internal/testsanitizers/tsan_test.go \
-	cmd/cgo/internal/testsanitizers/cshared_test.go
-
-set +u
-. ./make.bash "$@" --no-banner
-set -u
-`;
-		check = "bash run.bash --no-rebuild\n";
-		install = `
-../bin/go tool dist banner # print build info
-
-mkdir /work/system/bin
-ln -s \
-	../go/bin/go \
-	../go/bin/gofmt \
-	/work/system/bin
-`;
-	};
-
-	inputs = [ bash, go-bootstrap ];
-}
diff --git a/internal/rosa/package/go/820480.patch b/internal/rosa/package/go/820480.patch
new file mode 100644
index 00000000..05459a80
--- /dev/null
+++ b/internal/rosa/package/go/820480.patch
@@ -0,0 +1,24 @@
+From fa10bbcce5635dd533ba933252e9dabd8a7f5e2a Mon Sep 17 00:00:00 2001
+From: David Chase <drchase@google.com>
+Date: Mon, 24 Aug 2026 15:20:40 -0400
+Subject: [PATCH] simd/archsimd: added PMULL gate on carryless multiply test
+
+Fixes #80991.
+
+Change-Id: I637de72acbb338c4c3b0a47f4a5520c33fe81fd2
+---
+
+diff --git a/src/simd/archsimd/internal/simd_test/simd_arm64_test.go b/src/simd/archsimd/internal/simd_test/simd_arm64_test.go
+index f009488..7836fc8 100644
+--- a/src/simd/archsimd/internal/simd_test/simd_arm64_test.go
++++ b/src/simd/archsimd/internal/simd_test/simd_arm64_test.go
+@@ -22,6 +22,9 @@
+ }
+ 
+ func TestClMul(t *testing.T) {
++	if !archsimd.ARM64.PMULL() {
++		t.Skip("no carryless multiply")
++	}
+ 	var x = archsimd.LoadUint64x2([]uint64{1, 5})
+ 	var y = archsimd.LoadUint64x2([]uint64{3, 9})
+ 
diff --git a/internal/rosa/package/go/package.az b/internal/rosa/package/go/package.az
new file mode 100644
index 00000000..d06720b5
--- /dev/null
+++ b/internal/rosa/package/go/package.az
@@ -0,0 +1,58 @@
+package go {
+	description = "the Go programming language toolchain";
+	website = "https://go.dev";
+	anitya = 1227;
+
+	version# = "1.27.0";
+	source = remoteTar {
+		url = "https://go.dev/dl/go"+version+".src.tar.gz";
+		checksum = "Ookl2vP6KMfJuxaxX6nXZ1gnL43wZPl5GjpVsrI7IJiB4b3xr1PbnbYIOJ8v5jzG";
+		compress = gzip;
+	};
+	patches = [ "820480.patch" ];
+
+	env = [
+		"CC=cc",
+		"GOCACHE=/tmp/gocache",
+		"GOROOT_BOOTSTRAP=/system/go",
+		"TMPDIR=/dev/shm/go",
+	];
+
+	enterSource = true;
+
+	exec = generic {
+		chdir = false;
+		build = `
+mkdir /work/system/ "${TMPDIR}"
+cp -r . /work/system/go
+cd /work/system/go/src/
+chmod -R +w ..
+
+sed -i \
+	's,/lib/ld-musl-`+linuxArch+`.so.1,/system/bin/linker,' \
+	cmd/link/internal/`+arch+`/obj.go
+
+rm \
+	os/root_unix_test.go \
+	runtime/crash_cgo_test.go \
+	cmd/cgo/internal/testsanitizers/tsan_test.go \
+	cmd/cgo/internal/testsanitizers/cshared_test.go
+
+set +u
+. ./make.bash "$@" --no-banner
+set -u
+`;
+		check = "bash run.bash --no-rebuild\n";
+		install = `
+../bin/go tool dist banner # print build info
+
+mkdir /work/system/bin
+ln -s \
+	../go/bin/go \
+	../go/bin/gofmt \
+	/work/system/bin
+`;
+	};
+
+	inputs = [ bash, go-bootstrap ];
+}
-- 
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