<value>b3</value>
</enum>
- <enum name="Lane (32-bit)">
+ <enum name="Combine">
<desc>
Used for the lane select of `BRANCHZ`. To use an 8-bit condition, a
separate `ICMP` is required to cast to 16-bit.
<value default="true">none</value>
<value>h0</value>
<value>h1</value>
- <reserved/>
+ <value>and</value>
+ <value>lowbits</value>
</enum>
<enum name="Lane (16-bit)" implied="true">
source to a nonzero constant to implement a jump. May introduce
divergence, so generally requires `.reconverge` flow control.
</desc>
- <src lane="37">Value to compare against zero</src>
+ <src combine="true">Value to compare against zero</src>
<imm name="offset" start="8" size="27" signed="true"/>
+ <conservative/>
<mod name="eq" start="36" size="1"/>
</ins>
Jump to an indirectly specified (absolute or relative) address. Used to
jump to blend shaders at the end of a fragment shader.
</desc>
- <src>Value to compare against zero</src>
+ <src combine="true">Value to compare against zero</src>
<src>Branch target</src>
+ <conservative/>
<mod name="eq" start="36" size="1"/>
<mod name="absolute" start="40" size="1"/>
</ins>
swizzled = True
val = enums[f'lane_{src.size}_bit'].bare_values.index(mod)
encoded |= (val << src.offset['lane'])
+ elif src.combine and mod in enums['combine'].bare_values:
+ die_if(swizzled, "Multiple swizzles specified")
+ swizzled = True
+ val = enums['combine'].bare_values.index(mod)
+ encoded |= (val << src.offset['combine'])
elif src.size == 32 and mod in enums['widen'].bare_values:
die_if(not src.swizzle, "Instruction doesn't take widens")
die_if(swizzled, "Multiple swizzles specified")
# Model a single instruction
class Source:
- def __init__(self, index, size, is_float = False, swizzle = False, halfswizzle = False, widen = False, lanes = False, lane = None, absneg = False, notted = False, name = ""):
+ def __init__(self, index, size, is_float = False, swizzle = False,
+ halfswizzle = False, widen = False, lanes = False, combine = False, lane = None, absneg = False, notted = False, name = ""):
self.is_float = is_float or absneg
self.size = size
self.absneg = absneg
self.widen = widen
self.lanes = lanes
self.lane = lane
+ self.combine = combine
self.name = name
self.offset = {}
assert(size in [16, 32])
self.offset['swizzle'] = 24 + ((2 - index) * 2)
self.bits['swizzle'] = 2
+ if combine:
+ self.offset['combine'] = 37
+ self.bits['combine'] = 3
class Dest:
def __init__(self, name = ""):
halfswizzle = el.get('halfswizzle', False),
widen = el.get('widen', False),
lanes = el.get('lanes', False),
+ combine = el.get('combine', False),
lane = lane,
notted = el.get('not', False),
name = el.text or "")
"clamp": Modifier("clamp", 32, 2),
"sr_count": Modifier("staging_register_count", 33, 3, implied = True),
+ "conservative": Flag("conservative", 35),
"subgroup": Modifier("subgroup_size", 36, 4),
"update": Modifier("update_mode", 36, 2),
"sample": Modifier("sample_mode", 38, 2),