ActionAnalysis::ConstantInfo Struct Reference

#include <action_analysis.h>

Public Member Functions
unsigned	build_constant ()
unsigned	build_shiftable_constant ()
unsigned	valid_instruction_constant (int container_size) const

Public Attributes
TotalAlignment	alignment
unsigned	constant_value
int	container_size = -1
bool	initialized = false
safe_vector< ConstantPosition >	positions
bool	signExtend = false

Detailed Description

Information on all constants within a single container instruction

Member Function Documentation

build_shiftable_constant()

unsigned ActionAnalysis::ConstantInfo::build_shiftable_constant

(

)

Shifts a constant to the lower read bits point to determine if the constant can be used within a deposit-field

valid_instruction_constant()

unsigned ActionAnalysis::ConstantInfo::valid_instruction_constant

(

int

container_size

)

const

Because the assembly only recognizes constants between -8..7 or their corresponding container size complement, this function converts all container constants (post-shifted) to a pre-shift value between -8 and 7. If the value is used in a deposit-field instruction, the value is the post-rotation result, implicitly encoding the required rotation (no longer between -8 and 7). The assembler will need to undo this rotation, so it can recreate the pre-rotational value of between -8 and 7, along with its rotation parameter.