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nir/builder: Assert that intN_t immediates fit

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This assert won't catch all mistakes with this helper but it will at
least ensure that the top bits are all zero or all one which should help
catch bugs.

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
This commit is contained in:
Jason Ekstrand 2018-11-12 16:02:23 -06:00
parent 4266932c0b
commit 1f29f4db1e
1 changed files with 4 additions and 0 deletions
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4
src/compiler/nir/nir_builder.h
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@ -330,6 +330,10 @@ nir_imm_intN_t(nir_builder *build, uint64_t x, unsigned bit_size)
{
nir_const_value v;
assert(bit_size == 64 ||
(int64_t)x >> bit_size == 0 ||
(int64_t)x >> bit_size == -1);
memset(&v, 0, sizeof(v));
assert(bit_size <= 64);
v.i64[0] = x & (~0ull >> (64 - bit_size));