Mesa (staging/22.1): nir/opt_algebraic: Fix mask in shift by constant combining.
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Wed May 11 04:23:24 UTC 2022
Module: Mesa
Branch: staging/22.1
Commit: e2c69cd976b2b4eef250c9e11bc8a994d71ddd25
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=e2c69cd976b2b4eef250c9e11bc8a994d71ddd25
Author: Georg Lehmann <dadschoorse at gmail.com>
Date: Sat Apr 16 13:36:17 2022 +0200
nir/opt_algebraic: Fix mask in shift by constant combining.
The comment above is correct, but the code to calculate the mask was broken.
No Foz-db changes outside of noise.
Fixes: 0e6581b87dc ("nir/algebraic: Reassociate shift-by-constant of shift-by-constant")
Signed-off-by: Georg Lehmann <dadschoorse at gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15990>
(cherry picked from commit 66e917fff69497143ebf6593a40891ea3d1daf93)
---
.pick_status.json | 2 +-
src/compiler/nir/nir_opt_algebraic.py | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/.pick_status.json b/.pick_status.json
index bdaa9be782b..26f6e1dca0f 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -454,7 +454,7 @@
"description": "nir/opt_algebraic: Fix mask in shift by constant combining.",
"nominated": true,
"nomination_type": 1,
- "resolution": 0,
+ "resolution": 1,
"main_sha": null,
"because_sha": "0e6581b87dc4e168fa864cd39e8947a58999189a"
},
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 63c2427344f..dcd4c501e4a 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -420,7 +420,7 @@ optimizations.extend([
# bits of the second source. These replacements must correctly handle the
# case where (b % bitsize) + (c % bitsize) >= bitsize.
for s in [8, 16, 32, 64]:
- mask = (1 << s) - 1
+ mask = s - 1
ishl = "ishl@{}".format(s)
ishr = "ishr@{}".format(s)
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