microblaze: Fix irq.S code

It is ancient code. There is possible to save several instructions
just if we use offset instead of addik

Signed-off-by: Michal Simek <monstr@monstr.eu>

arch/microblaze/cpu/irq.S

@@ -27,129 +27,71 @@
 	.text
 	.global _interrupt_handler
 _interrupt_handler:
-	addi	r1, r1, -4
+	swi	r2, r1, -4
-	swi	r2, r1, 0
+	swi	r3, r1, -8
-	addi	r1, r1, -4
+	swi	r4, r1, -12
-	swi	r3, r1, 0
+	swi	r5, r1, -16
-	addi	r1, r1, -4
+	swi	r6, r1, -20
-	swi	r4, r1, 0
+	swi	r7, r1, -24
-	addi	r1, r1, -4
+	swi	r8, r1, -28
-	swi	r5, r1, 0
+	swi	r9, r1, -32
-	addi	r1, r1, -4
+	swi	r10, r1, -36
-	swi	r6, r1, 0
+	swi	r11, r1, -40
-	addi	r1, r1, -4
+	swi	r12, r1, -44
-	swi	r7, r1, 0
+	swi	r13, r1, -48
-	addi	r1, r1, -4
+	swi	r14, r1, -52
-	swi	r8, r1, 0
+	swi	r15, r1, -56
-	addi	r1, r1, -4
+	swi	r16, r1, -60
-	swi	r9, r1, 0
+	swi	r17, r1, -64
-	addi	r1, r1, -4
+	swi	r18, r1, -68
-	swi	r10, r1, 0
+	swi	r19, r1, -72
-	addi	r1, r1, -4
+	swi	r20, r1, -76
-	swi	r11, r1, 0
+	swi	r21, r1, -80
-	addi	r1, r1, -4
+	swi	r22, r1, -84
-	swi	r12, r1, 0
+	swi	r23, r1, -88
-	addi	r1, r1, -4
+	swi	r24, r1, -92
-	swi	r13, r1, 0
+	swi	r25, r1, -96
-	addi	r1, r1, -4
+	swi	r26, r1, -100
-	swi	r14, r1, 0
+	swi	r27, r1, -104
-	addi	r1, r1, -4
+	swi	r28, r1, -108
-	swi	r15, r1, 0
+	swi	r29, r1, -112
-	addi	r1, r1, -4
+	swi	r30, r1, -116
-	swi	r16, r1, 0
+	swi	r31, r1, -120
-	addi	r1, r1, -4
+	addik	r1, r1, -124
-	swi	r17, r1, 0
-	addi	r1, r1, -4
-	swi	r18, r1, 0
-	addi	r1, r1, -4
-	swi	r19, r1, 0
-	addi	r1, r1, -4
-	swi	r20, r1, 0
-	addi	r1, r1, -4
-	swi	r21, r1, 0
-	addi	r1, r1, -4
-	swi	r22, r1, 0
-	addi	r1, r1, -4
-	swi	r23, r1, 0
-	addi	r1, r1, -4
-	swi	r24, r1, 0
-	addi	r1, r1, -4
-	swi	r25, r1, 0
-	addi	r1, r1, -4
-	swi	r26, r1, 0
-	addi	r1, r1, -4
-	swi	r27, r1, 0
-	addi	r1, r1, -4
-	swi	r28, r1, 0
-	addi	r1, r1, -4
-	swi	r29, r1, 0
-	addi	r1, r1, -4
-	swi	r30, r1, 0
-	addi	r1, r1, -4
-	swi	r31, r1, 0
 	brlid	r15, interrupt_handler
 	nop
 	nop
-	lwi	r31, r1, 0
+	addik	r1, r1, 124
-	addi	r1, r1, 4
+	lwi	r31, r1, -120
-	lwi	r30, r1, 0
+	lwi	r30, r1, -116
-	addi	r1, r1, 4
+	lwi	r29, r1, -112
-	lwi	r29, r1, 0
+	lwi	r28, r1, -108
-	addi	r1, r1, 4
+	lwi	r27, r1, -104
-	lwi	r28, r1, 0
+	lwi	r26, r1, -100
-	addi	r1, r1, 4
+	lwi	r25, r1, -96
-	lwi	r27, r1, 0
+	lwi	r24, r1, -92
-	addi	r1, r1, 4
+	lwi	r23, r1, -88
-	lwi	r26, r1, 0
+	lwi	r22, r1, -84
-	addi	r1, r1, 4
+	lwi	r21, r1, -80
-	lwi	r25, r1, 0
+	lwi	r20, r1, -76
-	addi	r1, r1, 4
+	lwi	r19, r1, -72
-	lwi	r24, r1, 0
+	lwi	r18, r1, -68
-	addi	r1, r1, 4
+	lwi	r17, r1, -64
-	lwi	r23, r1, 0
+	lwi	r16, r1, -60
-	addi	r1, r1, 4
+	lwi	r15, r1, -56
-	lwi	r22, r1, 0
+	lwi	r14, r1, -52
-	addi	r1, r1, 4
+	lwi	r13, r1, -48
-	lwi	r21, r1, 0
+	lwi	r12, r1, -44
-	addi	r1, r1, 4
+	lwi	r11, r1, -40
-	lwi	r20, r1, 0
+	lwi	r10, r1, -36
-	addi	r1, r1, 4
+	lwi	r9, r1, -32
-	lwi	r19, r1, 0
+	lwi	r8, r1, -28
-	addi	r1, r1, 4
+	lwi	r7, r1, -24
-	lwi	r18, r1, 0
+	lwi	r6, r1, -20
-	addi	r1, r1, 4
+	lwi	r5, r1, -16
-	lwi	r17, r1, 0
+	lwi	r4, r1, -12
-	addi	r1, r1, 4
+	lwi	r3, r1, -8
-	lwi	r16, r1, 0
+	lwi	r2, r1, -4
-	addi	r1, r1, 4
-	lwi	r15, r1, 0
-	addi	r1, r1, 4
-	lwi	r14, r1, 0
-	addi	r1, r1, 4
-	lwi	r13, r1, 0
-	addi	r1, r1, 4
-	lwi	r12, r1, 0
-	addi	r1, r1, 4
-	lwi	r11, r1, 0
-	addi	r1, r1, 4
-	lwi	r10, r1, 0
-	addi	r1, r1, 4
-	lwi	r9, r1, 0
-	addi	r1, r1, 4
-	lwi	r8, r1, 0
-	addi	r1, r1, 4
-	lwi	r7, r1, 0
-	addi	r1, r1, 4
-	lwi	r6, r1, 0
-	addi	r1, r1, 4
-	lwi	r5, r1, 0
-	addi	r1, r1, 4
-	lwi	r4, r1, 0
-	addi	r1, r1, 4
-	lwi	r3, r1, 0
-	addi	r1, r1, 4
-	lwi	r2, r1, 0
-	addi	r1, r1, 4
 
 	/* enable_interrupt */
 #ifdef XILINX_USE_MSR_INSTR