Index: src/runtime/lookup-asm/lookup-asm-arm64-elf.S
==================================================================
--- src/runtime/lookup-asm/lookup-asm-arm64-elf.S
+++ src/runtime/lookup-asm/lookup-asm-arm64-elf.S
@@ -28,11 +28,11 @@
 .macro generate_lookup name not_found
 \name:
 	cbz	x0, ret_nil
 
 	tst	x0, #1
-	bne	.Ltagged_pointer_\name
+	b.ne	.Ltagged_pointer_\name
 
 	ldr	x2, [x0]
 	ldr	x2, [x2, #64]
 
 .Lmain_\name:

Index: src/runtime/lookup-asm/lookup-asm-mips-elf.S
==================================================================
--- src/runtime/lookup-asm/lookup-asm-mips-elf.S
+++ src/runtime/lookup-asm/lookup-asm-mips-elf.S
@@ -27,10 +27,13 @@
 .section .text
 .macro generate_lookup name not_found
 \name:
 	beqz	$a0, 0f
 
+	andi	$t0, $a0, 1
+	bnez	$t0, .Ltagged_pointer_\name
+
 	lw	$t0, 0($a0)
 	lw	$t0, 32($t0)
 
 .Lmain_\name:
 #ifdef OF_BIG_ENDIAN
@@ -87,10 +90,31 @@
 	addiu	$gp, $gp, 1b-\name
 
 	lw	$t9, %call16(\not_found)($gp)
 	jr	$t9
 #endif
+
+.Ltagged_pointer_\name:
+	and	$t0, $a0, 0xE
+	sll	$t0, $t0, 1
+
+#ifdef OF_PIC
+0:
+	lui	$gp, %hi(_gp_disp)
+	addiu	$gp, $gp, %lo(_gp_disp)
+	addu	$gp, $gp, $t9
+	addiu	$gp, $gp, 0b-\name
+
+	lw	$t1, %got(objc_tagged_pointer_classes)($gp)
+#else
+	la	$t1, objc_tagged_pointer_classes
+#endif
+	addu	$t0, $t1, $t0
+	ld	$t0, ($t0)
+	ld	$t0, 32($t0)
+
+	b	.Lmain_\name
 .type \name, %function
 .size \name, .-\name
 .endm
 
 .macro generate_lookup_super name lookup