def _load_word(self, array, reg, word):
"""Load an immediate value into a register w/o using load_word(); instead
append the instruction objects to an array.
Used when synthesizing the prologue/epilogue."""
array.append(ppc.addi(reg, 0, word & 0xFFFF, ignore_active=True))
if (word & 0xFFFF) != word:
array.append(
ppc.addis(reg,
reg, ((word + 32768) >> 16) & 0xFFFF,
ignore_active=True))
return
def _set_literal_value(self, value):
# Put the lower 16 bits into r-temp
self.code.add(ppc.addi(self.reg, 0, value & 0xFFFF))
# Addis r-temp with the upper 16 bits (shifted add immediate) and
# put the result in r-target
if (value & 0x7FFF) != value:
self.code.add(
ppc.addis(self.reg, self.reg, ((value + 32768) >> 16)))
return
def load_word(code, r_target, word):
"""
Generate the instruction sequence to load a word into r-target.
This can be used for any value greater than 2^16.
"""
# Put the lower 16 bits into r-temp
start = code.add(ppc.addi(r_target, 0, word & 0xFFFF))
# Addis r-temp with the upper 16 bits (shifted add immediate) and
# put the result in r-target
if (word & 0xFFFF) != word:
code.add(ppc.addis(r_target, r_target,
((word + 32768) >> 16) & 0xFFFF))
return start
def _load_word(self, array, reg, word):
"""Load an immediate value into a register w/o using load_word(); instead
append the instruction objects to an array.
Used when synthesizing the prologue/epilogue."""
array.append(ppc.addi(reg, 0, word & 0xFFFF, ignore_active=True))
uw = (word >> 16) & 0xFFFF
msb = word & 0x8000
if msb != 0:
# lower 16-bit MSB is set, upper 16 bits are 1, adjust uw
# If all upper 16 bits are 1, that is the value -1, so add 1 back in.
uw = (uw + 1) & 0xFFFF
if uw != 0:
array.append(ppc.addis(reg, reg, uw, ignore_active=True))
return
def _load_word(self, array, reg, word):
"""Load an immediate value into a register w/o using load_word(); instead
append the instruction objects to an array.
Used when synthesizing the prologue/epilogue."""
array.append(ppc.addi(reg, 0, word & 0xFFFF, ignore_active=True))
uw = (word >> 16) & 0xFFFF
msb = word & 0x8000
if msb != 0:
# lower 16-bit MSB is set, upper 16 bits are 1, adjust uw
# If all upper 16 bits are 1, that is the value -1, so add 1 back in.
uw = (uw + 1) & 0xFFFF
if uw != 0:
array.append(ppc.addis(reg, reg, uw, ignore_active=True))
return
def load_word(code, r_target, word):
"""
Generate the instruction sequence to load a word into r-target.
This can be used for any value greater than 2^16.
"""
# Put the lower 16 bits into r_target
start = code.add(ppc.addi(r_target, 0, word & 0xFFFF))
uw = (word >> 16) & 0xFFFF
msb = word & 0x8000
if msb != 0:
# lower 16-bit MSB is set, upper 16 bits are 1, adjust uw
# If all upper 16 bits are 1, that is the value -1, so add 1 back in.
uw = (uw + 1) & 0xFFFF
# Only issue addis if the value added (uw) is not zero.
if uw != 0:
code.add(ppc.addis(r_target, r_target, uw))
return start
def load_word(code, r_target, word):
"""
Generate the instruction sequence to load a word into r-target.
This can be used for any value greater than 2^16.
"""
# Put the lower 16 bits into r_target
start = code.add(ppc.addi(r_target, 0, word & 0xFFFF))
uw = (word >> 16) & 0xFFFF
msb = word & 0x8000
if msb != 0:
# lower 16-bit MSB is set, upper 16 bits are 1, adjust uw
# If all upper 16 bits are 1, that is the value -1, so add 1 back in.
uw = (uw + 1) & 0xFFFF
# Only issue addis if the value added (uw) is not zero.
if uw != 0:
code.add(ppc.addis(r_target, r_target, uw))
return start
