[Mesa-dev] [PATCH 2/8] nir/builder: Assert that intN_t immediates fit

[Jason Ekstrand]

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.
---
 src/compiler/nir/nir_builder.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/compiler/nir/nir_builder.h b/src/compiler/nir/nir_builder.h
index 3271a480520..3be630ab3dd 100644
--- a/src/compiler/nir/nir_builder.h
+++ b/src/compiler/nir/nir_builder.h
@@ -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));
-- 
2.19.1