Cypress CSC-1200T Guia do Utilizador descarregar pdf (Página 55)

Chapter 6. C and C++ programming 55

The fact that Fortran stores arrays in reverse order compared to C needs

to be taken into account. Therefore, the array ct contains the transpose

of the result of the matrix multiplication.

This program takes about one second to execute on a 375 MHz proces-

sor, which corresponds to the execution speed of about 240 Mﬂop/s.

6.4 C compiler options

The most typical compiler options are given in the Table 6.1. Manyofthe

options have corresponding compiler directives, which can be included

in the source code.

Compiler option Meaning

-c Compile only, do not attempt to link

-On Choose optimization level n (0,1,2,3)

-hoption Enable speciﬁc compiler actions

-haggress Aggressive optimization

-hunroll Enable loop unrolling

-hscalarn Choose scalar optimization level n (0,1,2,3)

-hstdc Strict conformance of the ISO C standard

-hsplit Split loops into smaller ones

-happrentice Compile for MPP Apprentice

-lapp Link with MPP Apprentice library

-g Compile for the Cray TotalView debugger

-Gf Debugging with full optimization

-Gp Debugging with partial optimization

-Gn Debugging with no optimization (same as -g)

-Xnpes Compile for npes processors

-Dmacro[=def ] Deﬁne a cpp macro

-Umacro Undeﬁne a cpp macro

-V Display the version number of the compiler

-Wphase[,"options"] Pass options to phase

-Iincpath Search include ﬁles also from incpath

-Llibpath Search libraries also from libpath

-lname Link also with library libname.a

Table 6.1: Typical compiler options.

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 123 124

Sem comentários

Cypress CSC-1200T Guia do Utilizador Página 55