C166 User's Guide

NOSAVEMAC Compiler Directive

Abbreviation

NOSM

Arguments

None.

Default

The C166 Compiler does not save MAC registers for interrupt functions.

µVision

Options — C166 — Misc Controls.

Description

The NOSAVEMAC directive directs the C166 Compiler not to save the MAC co-processor registers during interrupt functions.

See Also

MAC, SAVEMAC

Example

C166 SAMPLE.C NOSAVEMAC

The following example:

 stmt lvl     source
    1         void irq_func1 (void) interrupt 1 {
    2  1        ;
    3  1      }

demonstrates code generated using the SAVEMAC directive:

Code Generated
With SAVEMAC

; FUNCTION irq_func1
 1:  void irq_func1 (void) interrupt 1 {
0002 EC2E          PUSH      MAL
0004 EC2F          PUSH      MAH
0006 C6ED0000      SCXT      MRW,#00H
000A EC84          PUSH      IDX0
000C EC85          PUSH      IDX1
000E EC02          PUSH      QR0
0010 EC03          PUSH      QR1
0012 EC00          PUSH      QX0
0014 EC01          PUSH      QX1
0016 ECEE          PUSH      MCW
 2:    ;
0018 FCEE          POP       MCW
001A FC01          POP       QX1
001C FC00          POP       QX0
001E FC03          POP       QR1
0020 FC02          POP       QR0
0022 FC85          POP       IDX1
0024 FC84          POP       IDX0
0026 FCED          POP       MRW
0028 FC2F          POP       MAH
002A FC2E          POP       MAL
002C FCEF          POP       MSW
002E FB88          RETI
 3:  }

CODE SIZE: 48 Bytes

Code Generated With NOSAVEMAC
; FUNCTION irq_func1 1: void irq_func1 (void) interrupt 1 { 2: ; 0000 FB88 RETI 3: }
CODE SIZE: 2 Bytes

Note

When both the NOSAVEMAC directive and the MAC directives are used, the compiler saves a reduced context of MAC co-processor registers ( IDX0, MRW, MAH, MAL, MSW).
When the MAC directive is not used and the NOSAVEMAC directive is used, no MAC co-processor registers are saved in interrupts.

C166 User's Guide

NOSAVEMAC Compiler Directive

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