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nir/lower_io: fix array_length lowering if buffer is smaller than offset

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Matches SPIR-V -> NIR implementation of OpArrayLength.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8163>
This commit is contained in:
Rhys Perry
2020-12-07 14:44:15 +00:00
committed by Marge Bot
parent e10779a9f0
commit e200ce0996
1 changed files with 3 additions and 3 deletions
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6
src/compiler/nir/nir_lower_io.c
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@@ -1986,9 +1986,9 @@ lower_explicit_io_array_length(nir_builder *b, nir_intrinsic_instr *intrin,
nir_ssa_def *index = addr_to_index(b, addr, addr_format);
nir_ssa_def *offset = addr_to_offset(b, addr, addr_format);
nir_ssa_def *arr_size =
nir_idiv(b, nir_isub(b, nir_get_ssbo_size(b, index), offset),
nir_imm_int(b, stride));
nir_ssa_def *arr_size = nir_get_ssbo_size(b, index);
arr_size = nir_imax(b, nir_isub(b, arr_size, offset), nir_imm_int(b, 0u));
arr_size = nir_idiv(b, arr_size, nir_imm_int(b, stride));
nir_ssa_def_rewrite_uses(&intrin->dest.ssa, nir_src_for_ssa(arr_size));
nir_instr_remove(&intrin->instr);