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pan/bi: Mark some opcodes as default round-to-zero 

Conversions to integer have different rounding rules.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15187>
This commit is contained in:
Alyssa Rosenzweig 2022-02-27 15:46:03 -05:00 committed by Marge Bot
parent 24d072fd6a
commit de37f75554
1 changed files with 8 additions and 1 deletions
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9
src/panfrost/bifrost/bifrost_isa.py
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@ -247,6 +247,12 @@ def simplify_to_ir(ins):
'immediates': [m[0] for m in ins['immediates']]
}
# Converstions to integers default to rounding-to-zero
# All other opcodes default to rounding to nearest even
def default_round_to_zero(name):
# 8-bit int to float is exact
subs = ['_TO_U', '_TO_S', '_TO_V2U', '_TO_V2S', '_TO_V4U', '_TO_V4S']
return any([x in name for x in subs])
def combine_ir_variants(instructions, key):
seen = [op for op in instructions.keys() if op[1:] == key]
@ -278,7 +284,8 @@ def combine_ir_variants(instructions, key):
'immediates': sorted(variants[0]['immediates']),
'modifiers': modifiers,
'v': len(variants),
'ir': variants
'ir': variants,
'rtz': default_round_to_zero(key)
}
# Partition instructions to mnemonics, considering units and variants