pTAL Conversion Guide

Bit Operations

pTAL Conversion Guide—527302-002

14-2

pTAL

The shift count must be less than the number of bits in the shifted value; therefore, you

can shift an INT value up to 15 bits left or right, and an INT(32) value up to 31 bits left

or right.

The native compiler reports an error if the shift count is a constant and the shift-count

value is greater than the number of bits in the value to shift.

i := a '<<' 8; ! OK: result is %HCD00%

i := a '<<' 63; ! OK: result is %H0000%

i := a '<<' 64; ! ERROR: 64 is too large

i := a >> 8; ! OK: result is %HFFAB%

i := a >> 63; ! OK: result is %HFFFF%

i := a '>>' 8; ! OK: result is %H00AB%

i := a '>>' 63; ! OK: result is %H0000%

i := a << count1; ! OK: result is %H8000%

i := a '<<' count1; ! OK: result is %H0000%

i := a << count2; ! OK: result is %HCD00%

i := a '<<' count2; ! OK: result is %HCD00%

i := a >> count2; ! OK: result is %HFFAB%

i := a '>>' count2; ! OK: result is %H00AB%

--32-Bit Operands

i32 := b << 8; ! OK: result is %HCDEF6300%D

i32 := b << 63; ! OK: result is %H80000000%D

i32 := b '<<' 8; ! OK: result is %HCDEF6300%D

i32 := b '<<' 63; ! OK: result is %H00000000%D

i32 := b '<<' 64; ! ERROR: 64 is too large

i32 := b >> 8; ! OK: result is %HFFABCDEF%D

i32 := b >> 63; ! OK: result is %HFFFFFFFF%D

i32 := b '>>' 8; ! OK: result is %H00ABCDEF%D

i32 := b '>>' 63; ! OK: result is %H00000000%D

i32 := b << count2; ! OK: result is %HCDEF3600%D

i32 := b '<<' count2; ! OK: result is %HCDEF3600%D

i32 := b >> count2; ! OK: result is %HFFABCDEF%D

i32 := b '>>' count2; ! OK: result is %H00ABCDEF%D

Example 14-1. TAL Shift Operations (page 2 of 2)