PUSHR

Purpose

save multiple registers or stack

Format

opcode mask.rw

Operation

Condition codes

N ß N;

Z ß Z;

V ß V;

C ß C;

Exceptions

None

Opcodes

BB       PUSHR                        Push Registers

Description

The contents of registers whose number corresponds to set bits in the mask operand are pushed on the stack as long words. R[n] is pushed if mask <n> is set. The mask is scanned from bit 14 to bit 0. Bit 15 is ignored.

Notes

1. The order of pushing is specified so that the contents of higher numbered registers are stored at higher memory addresses. This results in a double floating datum stored in adjacent registers being stored by PUSHR in memory in the correct order

2. This instruction is similar to the sequence

PUSHL            R14

PUSHL            R13

...

PUSHL            R0

where only the masked registers are pushed.