2008-11-20 09:37:11 assembly align

Daniele Pagani (ITALY)

Message: 65613

Hi,

I'm porting the Scaler_Render function from VisualAudio to user application in uClinux.

In the source code, I've:

.align 2 ; // in VisualAudio on VisualDSP.

When I port the code, I need to remove this line, because the user application doesn't work fine.

When I enable this line, than the user application works in "strange" way.

Any suggestion?

Daniele.

The code:

.global _Scaler_Render;

.align 2;

_Scaler_Render:

P0 = R0 ; // instance struct ptr

link 0; // according to the compiler manual (near the bottom of page 1-192) a function

// MUST link at least 12 bytes of stack, even if it doesn't use it?

P1 = R1 ; // buffers array

P2 = R2; // tickSize

R0=[P1+ 0]; // *in

I0=R0;

R1=[P1+ 4]; // *out

I1=R1;

M0 = 4 (X);

R2=W[P0+ 0] (Z);// scale (16 bits), into bottom word

R1 = [I0++M0]; // get input

A0 = R2.L*R1.H, A1 = R2.L*R1.L (M); // scale*in

LSETUP (sampleLoopStart , sampleLoopEnd) LC0=P2; // blackfin lsetup can only get count from a P register

sampleLoopStart:

A1 = A1 >>> 15; // shift mixed-order sum

R0 = (A0 += A1) || R1 = [I0++M0]; // add higher-order and mixed-order sums, get next input

sampleLoopEnd:

A0 = R2.L*R1.H, A1 = R2.L*R1.L (M) || [I1++M0]=R0; // next scale*in, write output

P0=[FP+ 4];

unlink;

JUMP (P0);

_Scaler_Render.end:

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2008-11-20 17:52:56 Re: assembly align

Mike Frysinger (UNITED STATES)

Message: 65633

you should use ".align 4"