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SIMPLIFY EXPRESSIONS TO TRIPLES

Syntax:

[DO NOT] SIMPLIFY EXPRESSIONS TO TRIPLES [DO NOT] REDUCE EXPRESSIONS TO TRIPLES TRIPLES

Function:

Scalar assignment statements are split into statements of the form A = B <operator> C. Additional temporary local variables, named, for example, rtemp_1, rtemp_2 etc. are created if they are required, and declarations are added for them. No change is made to statements introduced by Fortran keywords.

This command is used to prepare code for execution on machines with novel architectures. Please see "APPRASE: Automatic parallelisation of Fortran to run on an FPGA" Farrimond B.T., Collins J. and Sharma A. 2008, Paper presented at The Summer Conference of the Society for Computer Simulation, Edinburgh, Scotland, June 2008. The command is used in combination with the commands:

• EXPAND INLINE
• UNWIND ALL LOOPS
• SCALARISE
• SEPARATE LIVES

Note, however, that unexpected speed improvements have been observed when this change is made to some Fortran codes.

Where to use this command:

Operating system command line	Yes
Configuration file, config.fsp	Yes
Specification (FSP) files, *.fsp	Yes
Interactively, to FPT> prompt:	Yes
Interactive command files	Yes
Embedded in the Fortran code	Yes

Default:

This change is not made by default (Note that defaults may be modified in the configuration file).

Example:

The code fragment shown below computes a polynomial:

REAL*8 r,x,k0,k1,k2,k3,k4 r = k0 + k1*x + k2*x*x + k3*x*x*x

This code is modified by the command (written in an fsp script):

% reduce expressions to triples

REAL*8 rtemp_1 REAL*8 rtemp_2 REAL*8 rtemp_3 REAL*8 rtemp_4 REAL*8 rtemp_5 REAL*8 rtemp_6 REAL*8 rtemp_7 REAL*8 rtemp_8 REAL*8 r,x,k0,k1,k2,k3,k4 ! ! FPT r=k0+k1*x+k2*x*x+k3*x*x*x rtemp_1=k1*x rtemp_2=k2*x rtemp_3=rtemp_2*x rtemp_4=k3*x rtemp_5=rtemp_4*x rtemp_6=rtemp_5*x rtemp_7=k0+rtemp_1 rtemp_8=rtemp_7+rtemp_3 r=rtemp_8+rtemp_6

Note that the original statement is commented-out by the delimiter "! FPT ".