From: Boris Brezillon <boris.brezillon@collabora.com>
Date: Wed, 19 Jun 2019 13:05:34 +0000 (+0200)
Subject: nir/lower_tex: Add an assert() in nir_lower_txs_lod()
X-Git-Tag: upstream/19.3.0~5258
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=56434450f634d54dd0e4bf3d243dbf931932ff93;p=platform%2Fupstream%2Fmesa.git

nir/lower_tex: Add an assert() in nir_lower_txs_lod()

We don't expect the output of a TXS instruction to be wider than a
vec3. Add an assert() to make sure this never happens.

Suggested-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
---

diff --git a/src/compiler/nir/nir_lower_tex.c b/src/compiler/nir/nir_lower_tex.c
index 8a36edf..05b46b9 100644
--- a/src/compiler/nir/nir_lower_tex.c
+++ b/src/compiler/nir/nir_lower_tex.c
@@ -1011,6 +1011,7 @@ nir_lower_txs_lod(nir_builder *b, nir_tex_instr *tex)
    if (tex->is_array) {
       nir_ssa_def *comp[3];
 
+      assert(dest_size <= ARRAY_SIZE(comp));
       for (unsigned i = 0; i < dest_size - 1; i++)
          comp[i] = nir_channel(b, minified, i);