diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 2672971b83f3..bed3f1c8d9d2 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -16,6 +16,7 @@ config ALPHA
 	select ARCH_NO_PREEMPT
 	select ARCH_NO_SG_CHAIN
 	select ARCH_SUPPORTS_ATOMIC_RMW
+	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select FORCE_PCI
 	select PCI_DOMAINS if PCI
diff --git a/arch/alpha/include/asm/asm-prototypes.h b/arch/alpha/include/asm/asm-prototypes.h
index c8ae46fc2e74..672fea15032f 100644
--- a/arch/alpha/include/asm/asm-prototypes.h
+++ b/arch/alpha/include/asm/asm-prototypes.h
@@ -17,3 +17,9 @@ extern void __remlu(void);
 extern void __divqu(void);
 extern void __remqu(void);
 extern unsigned long __udiv_qrnnd(unsigned long *, unsigned long, unsigned long , unsigned long);
+
+#ifdef CONFIG_ARCH_SUPPORTS_INT128
+extern __int128_t __ashlti3(__int128_t a, int shift);
+extern __int128_t __ashrti3(__int128_t a, int shift);
+extern __int128_t __lshrti3(__int128_t a, int shift);
+#endif
diff --git a/arch/alpha/lib/Makefile b/arch/alpha/lib/Makefile
index 84046e730e6d..f77d4a46f2e6 100644
--- a/arch/alpha/lib/Makefile
+++ b/arch/alpha/lib/Makefile
@@ -35,6 +35,8 @@ lib-y =	__divqu.o __remqu.o __divlu.o __remlu.o \
 	callback_srm.o srm_puts.o srm_printk.o \
 	fls.o
 
+obj-$(CONFIG_ARCH_SUPPORTS_INT128) += tishift.o
+
 # The division routines are built from single source, with different defines.
 AFLAGS___divqu.o = -DDIV
 AFLAGS___remqu.o =       -DREM
diff --git a/arch/alpha/lib/tishift.c b/arch/alpha/lib/tishift.c
new file mode 100644
index 000000000000..8319907d8150
--- /dev/null
+++ b/arch/alpha/lib/tishift.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 128-bit shift helpers.
+ *
+ * gcc open-codes a variable 128-bit shift when optimizing for speed, but
+ * calls these libgcc routines when optimizing for size.
+ */
+
+#include <linux/export.h>
+#include <linux/types.h>
+#include <asm/asm-prototypes.h>
+
+union ti {
+	__int128_t val;
+	struct {
+		u64 low;
+		u64 high;
+	};
+};
+
+noinstr __int128_t __ashlti3(__int128_t a, int shift)
+{
+	union ti ti = { .val = a };
+
+	if (!shift)
+		return ti.val;
+	if (shift < 64) {
+		ti.high = (ti.high << shift) | (ti.low >> (64 - shift));
+		ti.low <<= shift;
+	} else {
+		ti.high = ti.low << (shift - 64);
+		ti.low = 0;
+	}
+	return ti.val;
+}
+EXPORT_SYMBOL(__ashlti3);
+
+noinstr __int128_t __ashrti3(__int128_t a, int shift)
+{
+	union ti ti = { .val = a };
+
+	if (!shift)
+		return ti.val;
+	if (shift < 64) {
+		ti.low = (ti.low >> shift) | (ti.high << (64 - shift));
+		ti.high = (s64)ti.high >> shift;
+	} else {
+		ti.low = (s64)ti.high >> (shift - 64);
+		ti.high = (s64)ti.high >> 63;
+	}
+	return ti.val;
+}
+EXPORT_SYMBOL(__ashrti3);
+
+noinstr __int128_t __lshrti3(__int128_t a, int shift)
+{
+	union ti ti = { .val = a };
+
+	if (!shift)
+		return ti.val;
+	if (shift < 64) {
+		ti.low = (ti.low >> shift) | (ti.high << (64 - shift));
+		ti.high >>= shift;
+	} else {
+		ti.low = ti.high >> (shift - 64);
+		ti.high = 0;
+	}
+	return ti.val;
+}
+EXPORT_SYMBOL(__lshrti3);