Hi,

When I run the below small example in BF533 processor, I am getting the value
incorrect.

Asm_code.asm:

            r1.h  = 0x3E5A;

            r1.l   = 0x2778;

            A0    = R1;

            R3.L = 0XFFDD; // -35 in decimal

            R3 = R3.L(X);

            A0 =  ASHIFT A0 BY R3.L;

Can any tell me why the output of accumulator is not zero.

Regards

Sundar.S

Sundar,

This is from the Programmers Ref Manual

The "ASHIFT" versions can shift 32-bit Dreg and 40-bit Accumulator

registers by up to -32 through +31 places.

This means only 6 LS bits are used from R3.L.  0xFFDD is interpreted as
0x001D, which is +29, and hence, the correct result that you see
(0xEF00000000) in A0.

Cheers,

George

  _____  

From: a...@yahoogroups.com [mailto:a...@yahoogroups.com] On Behalf Of Sundar
S.
Sent: Wednesday, August 30, 2006 4:15 AM
To: a...@yahoogroups.com
Cc: Sundar S.
Subject: [adsp] Facing problem in ASHIFT instrauction in BF533

Hi,

When I run the below small example in BF533 processor, I am getting the
value incorrect.

Asm_code.asm:

            r1.h  = 0x3E5A;

            r1.l   = 0x2778;

            A0    = R1;

            R3.L = 0XFFDD; // -35 in decimal

            R3 = R3.L(X);

            A0 =  ASHIFT A0 BY R3.L;

Can any tell me why the output of accumulator is not zero.

Regards

Sundar.SS

even I got the same result when I compiled but I do not know the exact reason...
  ----- Original Message -----

  From: George Kadziolka

  To: 'Sundar S.' ; a...@yahoogroups.com

  Sent: Wednesday, August 30, 2006 6:06 PM
  Subject: RE: [adsp] Facing problem in ASHIFT instrauction in BF533

  Sundar,

  This is from the Programmers Ref Manual

  The "ASHIFT" versions can shift 32-bit Dreg and 40-bit Accumulator

  registers by up to -32 through +31 places.

  This means only 6 LS bits are used from R3.L.  0xFFDD is interpreted as 0x001D, which is +29,
and hence, the correct result that you see (0xEF00000000) in A0.

  Cheers,

  George

------------------------------------------------------------------------------

  From: a...@yahoogroups.com [mailto:a...@yahoogroups.com] On Behalf Of Sundar S.
  Sent: Wednesday, August 30, 2006 4:15 AM
  To: a...@yahoogroups.com
  Cc: Sundar S.
  Subject: [adsp] Facing problem in ASHIFT instrauction in BF533

  Hi,

  When I run the below small example in BF533 processor, I am getting the value incorrect.

  Asm_code.asm:

              r1.h  = 0x3E5A;

              r1.l   = 0x2778;

              A0    = R1;

              R3.L = 0XFFDD; // -35 in decimal

              R3 = R3.L(X);

              A0 =  ASHIFT A0 BY R3.L;

  Can any tell me why the output of accumulator is not zero.

  Regards

  Sundar.SS

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