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nir: Add a combined alignment helper

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Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@colllabora.com>
Reviewed-by: M Henning <drawoc@darkrefraction.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21524>
This commit is contained in:
Faith Ekstrand
2023-02-27 08:33:02 -06:00
committed by Marge Bot
parent e433a7c4fa
commit ca4d73ba36
2 changed files with 19 additions and 7 deletions
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22
src/compiler/nir/nir.h
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@@ -1958,6 +1958,22 @@ nir_intrinsic_set_align(nir_intrinsic_instr *intrin,
nir_intrinsic_set_align_offset(intrin, align_offset);
}
/** Returns a simple alignment for an align_mul/offset pair
*
* This helper converts from the full mul+offset alignment scheme used by
* most NIR intrinsics to a simple alignment. The returned value is the
* largest power of two which divides both align_mul and align_offset.
* For any offset X which satisfies the complex alignment described by
* align_mul/offset, X % align == 0.
*/
static inline uint32_t
nir_combined_align(uint32_t align_mul, uint32_t align_offset)
{
assert(util_is_power_of_two_nonzero(align_mul));
assert(align_offset < align_mul);
return align_offset ? 1 << (ffs(align_offset) - 1) : align_mul;
}
/** Returns a simple alignment for a load/store intrinsic offset
*
* Instead of the full mul+offset alignment scheme provided by the ALIGN_MUL
@@ -1968,10 +1984,8 @@ nir_intrinsic_set_align(nir_intrinsic_instr *intrin,
static inline unsigned
nir_intrinsic_align(const nir_intrinsic_instr *intrin)
{
const unsigned align_mul = nir_intrinsic_align_mul(intrin);
const unsigned align_offset = nir_intrinsic_align_offset(intrin);
assert(align_offset < align_mul);
return align_offset ? 1 << (ffs(align_offset) - 1) : align_mul;
return nir_combined_align(nir_intrinsic_align_mul(intrin),
nir_intrinsic_align_offset(intrin));
}
static inline bool