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nir: Make nir_build_deref_offset() support ptr_as_array

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nir_build_deref_offset() can be extended to support calculating an
offset relative to a base pointer.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7565>
This commit is contained in:
Boris Brezillon 2020-05-14 13:18:33 +02:00 • committed by Marge Bot
parent 949f8572ec
commit cab995b463
1 changed files with 2 additions and 1 deletions
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3
src/compiler/nir/nir_deref.c
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@ -334,7 +334,8 @@ nir_build_deref_offset(nir_builder *b, nir_deref_instr *deref,
nir_ssa_def *offset = nir_imm_intN_t(b, 0, deref->dest.ssa.bit_size);
for (nir_deref_instr **p = &path.path[1]; *p; p++) {
switch ((*p)->deref_type) {
case nir_deref_type_array: {
case nir_deref_type_array:
case nir_deref_type_ptr_as_array: {
nir_ssa_def *index = nir_ssa_for_src(b, (*p)->arr.index, 1);
int stride = type_get_array_stride((*p)->type, size_align);
offset = nir_iadd(b, offset, nir_amul_imm(b, index, stride));