NAME
cmp.ops - Comparison Opcodes
DESCRIPTION
Operations that compare two registers against each other. Some of these operations affect control flow directly; others do not.
Flow control comparison operators
These operators branch based on the relationship between their operands.
- eq(in INT, in INT, inconst LABEL)
- eq(in NUM, in NUM, inconst LABEL)
- eq(in STR, in STR, inconst LABEL)
- eq(invar PMC, invar PMC, inconst LABEL)
- eq(invar PMC, in INT, inconst LABEL)
- eq(invar PMC, in NUM, inconst LABEL)
- eq(invar PMC, in STR, inconst LABEL)
- eq_str(invar PMC, invar PMC, inconst LABEL)
- eq_num(invar PMC, invar PMC, inconst LABEL)
- eq_addr(in STR, in STR, inconst LABEL)
- eq_addr(invar PMC, invar PMC, inconst LABEL) Branch if $1 is equal to $2. For PMCs this does a generic comparison, whatever that is for the involved PMCs. Mixed PMC number/string operands do a numeric or string comparison respectively.eq_str and eq_num enforce string or number comparisons.eq_addr compares the address of the objects or strings.
- ne(in INT, in INT, inconst LABEL)
- ne(in NUM, in NUM, inconst LABEL)
- ne(in STR, in STR, inconst LABEL)
- ne(invar PMC, invar PMC, inconst LABEL)
- ne(invar PMC, in INT, inconst LABEL)
- ne(invar PMC, in NUM, inconst LABEL)
- ne(invar PMC, in STR, inconst LABEL)
- ne_str(invar PMC, invar PMC, inconst LABEL)
- ne_num(invar PMC, invar PMC, inconst LABEL)
- ne_addr(in STR, in STR, inconst LABEL)
- ne_addr(invar PMC, invar PMC, inconst LABEL) Branch if $1 is not equal to $2.
- lt(in INT, in INT, inconst LABEL)
- lt(in NUM, in NUM, inconst LABEL)
- lt(in STR, in STR, inconst LABEL)
- lt(invar PMC, invar PMC, inconst LABEL)
- lt(invar PMC, in INT, inconst LABEL)
- lt(invar PMC, in NUM, inconst LABEL)
- lt(invar PMC, in STR, inconst LABEL)
- lt_str(invar PMC, invar PMC, inconst LABEL)
- lt_num(invar PMC, invar PMC, inconst LABEL) Branch if $1 is less than $2.
- le(in INT, in INT, inconst LABEL)
- le(in NUM, in NUM, inconst LABEL)
- le(in STR, in STR, inconst LABEL)
- le(invar PMC, invar PMC, inconst LABEL)
- le(invar PMC, in INT, inconst LABEL)
- le(invar PMC, in NUM, inconst LABEL)
- le(invar PMC, in STR, inconst LABEL)
- le_str(invar PMC, invar PMC, inconst LABEL)
- le_num(invar PMC, invar PMC, inconst LABEL) Branch if $1 is less than or equal to $2.
- gt(invar PMC, invar PMC, inconst LABEL)
- gt(invar PMC, in INT, inconst LABEL)
- gt(invar PMC, in NUM, inconst LABEL)
- gt(invar PMC, in STR, inconst LABEL)
- gt_str(invar PMC, invar PMC, inconst LABEL)
- gt_num(invar PMC, invar PMC, inconst LABEL) Branch if $1 is greater than $2.
- ge(invar PMC, invar PMC, inconst LABEL)
- ge(invar PMC, in INT, inconst LABEL)
- ge(invar PMC, in NUM, inconst LABEL)
- ge(invar PMC, in STR, inconst LABEL)
- ge_str(invar PMC, invar PMC, inconst LABEL)
- ge_num(invar PMC, invar PMC, inconst LABEL) Branch if $1 is greater than or equal to $2.
- if_null(invar PMC, inconst LABEL) Branch to $2 if $1 is a NULL PMC.
- if_null(invar STR, inconst LABEL) Branch to $2 if $1 is a NULL STRING.
- unless_null(invar PMC, inconst LABEL) Branch to $2 if $1 is not a NULL PMC.
- unless_null(invar STR, inconst LABEL) Branch to $2 if $1 is not a NULL STRING.
Non-flow control comparison ops
These ops do comparisons and truth testing without doing flow control.
- cmp(out INT, in INT, in INT)
- cmp(out INT, in NUM, in NUM)
- cmp(out INT, in STR, in STR)
- cmp(out INT, invar PMC, invar PMC)
- cmp(out INT, invar PMC, in INT)
- cmp(out INT, invar PMC, in NUM)
- cmp(out INT, invar PMC, in STR)
- cmp_str(out INT, invar PMC, invar PMC)
- cmp_num(out INT, invar PMC, invar PMC) Sets $1 to -1 if $2 < $3, +1 if $2 > $3, and 0 otherwise.
- cmp_pmc(out PMC, invar PMC, invar PMC) Does the same thing as the other cmp_* variants, but puts a PMC in $1. This is useful for avoiding the semipredicate problem in HLLs where two aggregate PMCs are not always comparable.
- issame(out INT, invar PMC, invar PMC)
- issame(out INT, in STR, in STR) Sets $1 to 1 or 0, depending on the identity of the 2 objects. The identity is the PMCs memory address.
- isntsame(out INT, invar PMC, invar PMC)
- isntsame(out INT, in STR, in STR) Sets $1 to 0 or 1, depending on the identity of the 2 objects.
- istrue(out INT, invar PMC) Sets $1 to 1 or 0, depending on whether $2 is true or not.
- isfalse(out INT, invar PMC) Sets $1 to 1 or 0, depending on whether $2 is false or not.
- isnull(out INT, in PMC) Sets $1 to 1 if the object is null, 0 otherwise.
- isnull(out INT, in STR) Sets $1 to 1 if the string is null, 0 otherwise.
- isgt(out INT, in INT, in INT)
- isgt(out INT, in NUM, in NUM)
- isgt(out INT, in STR, in STR) These 3 opcodes are valid, but create as their reverse.
- isgt(out INT, invar PMC, invar PMC) Sets $1 to 1 if $2 is greater than $3.
- isge(out INT, in INT, in INT)
- isge(out INT, in NUM, in NUM)
- isge(out INT, in STR, in STR) These 3 opcodes are valid, but create as their reverse.
- isge(out INT, invar PMC, invar PMC) Sets $1 to 1 if $2 is greater than or equal to $3.
- isle(out INT, in INT, in INT)
- isle(out INT, in NUM, in NUM)
- isle(out INT, in STR, in STR)
- isle(out INT, invar PMC, invar PMC) Sets $1 to 1 if $2 is less than or equal to $3.
- islt(out INT, in INT, in INT)
- islt(out INT, in NUM, in NUM)
- islt(out INT, in STR, in STR)
- islt(out INT, invar PMC, invar PMC) Sets $1 to 1 if $2 is less than $3.
- iseq(out INT, in INT, in INT)
- iseq(out INT, in NUM, in NUM)
- iseq(out INT, in STR, in STR)
- iseq(out INT, invar PMC, invar PMC) Sets $1 to 1 if $2 is equal to $3.
- isne(out INT, in INT, in INT)
- isne(out INT, in NUM, in NUM)
- isne(out INT, in STR, in STR)
- isne(out INT, invar PMC, invar PMC) Sets $1 to 1 if $2 is not equal to $3.
Logical operations
These operations apply logical functions to their arguments.
- and(out INT, in INT, in INT)
- and(invar PMC, invar PMC, invar PMC) Short-circuiting logical and. Returns $2 if it's false, else returns $3.
- not(inout INT)
- not(invar PMC) Set the boolean state of $1 to the opposite of the boolean state from $1.
- not(out INT, in INT)
- not(out PMC, invar PMC)
- or(out INT, in INT, in INT)
- or(invar PMC, invar PMC, invar PMC) Short-circuiting logical or. Returns $2 if it's true, else returns $3.
- xor(out INT, in INT, in INT)
- xor(invar PMC, invar PMC, invar PMC) Logical xor. Returns $2 if it's true and $3 isn't, returns $3 if it's true and $2 isn't, else returns false.
COPYRIGHT
Copyright (C) 2001-2009, Parrot Foundation.
LICENSE
This program is free software. It is subject to the same license as the Parrot interpreter itself.