aboutsummaryrefslogtreecommitdiffstats
path: root/arch/microblaze/lib/muldi3.S
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--arch/microblaze/lib/muldi3.S121
1 files changed, 0 insertions, 121 deletions
diff --git a/arch/microblaze/lib/muldi3.S b/arch/microblaze/lib/muldi3.S
deleted file mode 100644
index ceeaa8c407f2..000000000000
--- a/arch/microblaze/lib/muldi3.S
+++ /dev/null
@@ -1,121 +0,0 @@
-#include <linux/linkage.h>
-
-/*
- * Multiply operation for 64 bit integers, for devices with hard multiply
- * Input : Operand1[H] in Reg r5
- * Operand1[L] in Reg r6
- * Operand2[H] in Reg r7
- * Operand2[L] in Reg r8
- * Output: Result[H] in Reg r3
- * Result[L] in Reg r4
- *
- * Explaination:
- *
- * Both the input numbers are divided into 16 bit number as follows
- * op1 = A B C D
- * op2 = E F G H
- * result = D * H
- * + (C * H + D * G) << 16
- * + (B * H + C * G + D * F) << 32
- * + (A * H + B * G + C * F + D * E) << 48
- *
- * Only 64 bits of the output are considered
- */
-
- .text
- .globl __muldi3
- .type __muldi3, @function
- .ent __muldi3
-
-__muldi3:
- addi r1, r1, -40
-
-/* Save the input operands on the caller's stack */
- swi r5, r1, 44
- swi r6, r1, 48
- swi r7, r1, 52
- swi r8, r1, 56
-
-/* Store all the callee saved registers */
- sw r20, r1, r0
- swi r21, r1, 4
- swi r22, r1, 8
- swi r23, r1, 12
- swi r24, r1, 16
- swi r25, r1, 20
- swi r26, r1, 24
- swi r27, r1, 28
-
-/* Load all the 16 bit values for A thru H */
- lhui r20, r1, 44 /* A */
- lhui r21, r1, 46 /* B */
- lhui r22, r1, 48 /* C */
- lhui r23, r1, 50 /* D */
- lhui r24, r1, 52 /* E */
- lhui r25, r1, 54 /* F */
- lhui r26, r1, 56 /* G */
- lhui r27, r1, 58 /* H */
-
-/* D * H ==> LSB of the result on stack ==> Store1 */
- mul r9, r23, r27
- swi r9, r1, 36 /* Pos2 and Pos3 */
-
-/* Hi (Store1) + C * H + D * G ==> Store2 ==> Pos1 and Pos2 */
-/* Store the carry generated in position 2 for Pos 3 */
- lhui r11, r1, 36 /* Pos2 */
- mul r9, r22, r27 /* C * H */
- mul r10, r23, r26 /* D * G */
- add r9, r9, r10
- addc r12, r0, r0
- add r9, r9, r11
- addc r12, r12, r0 /* Store the Carry */
- shi r9, r1, 36 /* Store Pos2 */
- swi r9, r1, 32
- lhui r11, r1, 32
- shi r11, r1, 34 /* Store Pos1 */
-
-/* Hi (Store2) + B * H + C * G + D * F ==> Store3 ==> Pos0 and Pos1 */
- mul r9, r21, r27 /* B * H */
- mul r10, r22, r26 /* C * G */
- mul r7, r23, r25 /* D * F */
- add r9, r9, r11
- add r9, r9, r10
- add r9, r9, r7
- swi r9, r1, 32 /* Pos0 and Pos1 */
-
-/* Hi (Store3) + A * H + B * G + C * F + D * E ==> Store3 ==> Pos0 */
- lhui r11, r1, 32 /* Pos0 */
- mul r9, r20, r27 /* A * H */
- mul r10, r21, r26 /* B * G */
- mul r7, r22, r25 /* C * F */
- mul r8, r23, r24 /* D * E */
- add r9, r9, r11
- add r9, r9, r10
- add r9, r9, r7
- add r9, r9, r8
- sext16 r9, r9 /* Sign extend the MSB */
- shi r9, r1, 32
-
-/* Move results to r3 and r4 */
- lhui r3, r1, 32
- add r3, r3, r12
- shi r3, r1, 32
- lwi r3, r1, 32 /* Hi Part */
- lwi r4, r1, 36 /* Lo Part */
-
-/* Restore Callee saved registers */
- lw r20, r1, r0
- lwi r21, r1, 4
- lwi r22, r1, 8
- lwi r23, r1, 12
- lwi r24, r1, 16
- lwi r25, r1, 20
- lwi r26, r1, 24
- lwi r27, r1, 28
-
-/* Restore Frame and return */
- rtsd r15, 8
- addi r1, r1, 40
-
-.size __muldi3, . - __muldi3
-.end __muldi3