arch/blackfin/lib/umulsi3_highpart.S

   1 /*
   2  * Copyright 2007 Analog Devices Inc.
   3  *
   4  * Licensed under the Clear BSD license or the GPL-2 (or later)
   5  */
   6
   7 .align 2
   8 .global ___umulsi3_highpart;
   9 .type ___umulsi3_highpart, STT_FUNC;
  10
  11 #ifdef CONFIG_ARITHMETIC_OPS_L1
  12 .section .l1.text
  13 #else
  14 .text
  15 #endif
  16
  17 ___umulsi3_highpart:
  18         R2 = R1.H * R0.H, R3 = R1.L * R0.H (FU);
  19         R0 = R1.L * R0.L, R1 = R1.H * R0.L (FU);
  20         R0 >>= 16;
  21         /* Unsigned multiplication has the nice property that we can
  22            ignore carry on this first addition.  */
  23         R0 = R0 + R3;
  24         R0 = R0 + R1;
  25         cc = ac0;
  26         R1 = cc;
  27         R1 = PACK(R1.l,R0.h);
  28         R0 = R1 + R2;
  29         RTS;
  30
  31 .size ___umulsi3_highpart, .-___umulsi3_highpart