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Add an option to the shuffle fuzzer that lets you fuzz exclusively 

within a single bit-width of vectors. This is particularly useful for
when you know you have bugs in a certain area and want to find simpler
test cases than those produced by an open-ended fuzzing that ends up
legalizing the vector in addition to shuffling it.

llvm-svn: 215056
This commit is contained in:
Chandler Carruth 2014-08-07 04:49:54 +00:00
parent fcb526020a
commit ae42d7d020
1 changed files with 16 additions and 2 deletions
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18
llvm/utils/shuffle_fuzz.py
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@ -26,14 +26,28 @@ def main():
help='Show verbose output')
parser.add_argument('--fixed-num-shuffles', type=int,
help='Specify a fixed number of shuffles to test')
parser.add_argument('--fixed-bit-width', type=int, choices=[128, 256],
help='Specify a fixed bit width of vector to test')
parser.add_argument('--triple',
help='Specify a triple string to include in the IR')
args = parser.parse_args()
random.seed(args.seed)
width = random.choice([2, 4, 8, 16, 32, 64])
element_type = random.choice(['i8', 'i16', 'i32', 'i64', 'f32', 'f64'])
if args.fixed_bit_width is not None:
if args.fixed_bit_width == 128:
(width, element_type) = random.choice(
[(2, 'i64'), (4, 'i32'), (8, 'i16'), (16, 'i8'),
(2, 'f64'), (4, 'f32')])
elif args.fixed_bit_width == 256:
(width, element_type) = random.choice([
(4, 'i64'), (8, 'i32'), (16, 'i16'), (32, 'i8'),
(4, 'f64'), (8, 'f32')])
else:
sys.exit(1) # Checked above by argument parsing.
else:
width = random.choice([2, 4, 8, 16, 32, 64])
element_type = random.choice(['i8', 'i16', 'i32', 'i64', 'f32', 'f64'])
# FIXME: Support blends.
shuffle_indices = [-1] + range(width)