Merge branch 'master' into csb1725

[mv-sheeva.git] / arch / microblaze / lib / mulsi3.S

diff --git a/arch/microblaze/lib/mulsi3.S b/arch/microblaze/lib/mulsi3.S
new file mode 100644 (file)
index 0000000..90bd7b9
--- /dev/null
+++ b/arch/microblaze/lib/mulsi3.S
@@ -0,0 +1,46 @@
+#include <linux/linkage.h>
+
+/*
+ * Multiply operation for 32 bit integers.
+ *     Input : Operand1 in Reg r5
+ *             Operand2 in Reg r6
+ *     Output: Result [op1 * op2] in Reg r3
+ */
+       .text
+       .globl  __mulsi3
+       .type __mulsi3,  @function
+       .ent __mulsi3
+
+__mulsi3:
+       .frame  r1, 0, r15
+       add     r3, r0, r0
+       beqi    r5, result_is_zero /* multiply by zero */
+       beqi    r6, result_is_zero /* multiply by zero */
+       bgeid   r5, r5_pos
+       xor     r4, r5, r6 /* get the sign of the result */
+       rsubi   r5, r5, 0 /* make r5 positive */
+r5_pos:
+       bgei    r6, r6_pos
+       rsubi   r6, r6, 0 /* make r6 positive */
+r6_pos:
+       bri     l1
+l2:
+       add     r5, r5, r5
+l1:
+       srl     r6, r6
+       addc    r7, r0, r0
+       beqi    r7, l2
+       bneid   r6, l2
+       add     r3, r3, r5
+       blti    r4, negateresult
+       rtsd    r15, 8
+       nop
+negateresult:
+       rtsd    r15, 8
+       rsub    r3, r3, r0
+result_is_zero:
+       rtsd    r15, 8
+       addi    r3, r0, 0
+
+.size __mulsi3,  . - __mulsi3
+.end __mulsi3