Mesa (main): spirv: Fix array length of buffers larger than INT32_MAX.
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Fri Jul 22 18:19:43 UTC 2022
Module: Mesa
Branch: main
Commit: 430d1a20eb1e49772539068e04baa071471a7bc5
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=430d1a20eb1e49772539068e04baa071471a7bc5
Author: Ian Romanick <ian.d.romanick at intel.com>
Date: Tue Feb 9 11:18:48 2021 -0800
spirv: Fix array length of buffers larger than INT32_MAX.
Like 90a8fb03556e.
fossil-db results:
All Skylake and newer Intel platforms had similar results. (Ice Lake shown)
Instructions in all programs: 141442369 -> 141442363 (-0.0%)
Instructions helped: 1
Cycles in all programs: 9099270231 -> 9099270187 (-0.0%)
Cycles helped: 1
Reviewed-by: Emma Anholt <emma at anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17637>
---
src/compiler/spirv/vtn_variables.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/src/compiler/spirv/vtn_variables.c b/src/compiler/spirv/vtn_variables.c
index 0eb7f60b24c..89e39963086 100644
--- a/src/compiler/spirv/vtn_variables.c
+++ b/src/compiler/spirv/vtn_variables.c
@@ -2647,13 +2647,11 @@ vtn_handle_variables(struct vtn_builder *b, SpvOp opcode,
/* array_length = max(buffer_size - offset, 0) / stride */
nir_ssa_def *array_length =
- nir_idiv(&b->nb,
- nir_imax(&b->nb,
- nir_isub(&b->nb,
- buf_size,
- nir_imm_int(&b->nb, offset)),
- nir_imm_int(&b->nb, 0u)),
- nir_imm_int(&b->nb, stride));
+ nir_udiv_imm(&b->nb,
+ nir_usub_sat(&b->nb,
+ buf_size,
+ nir_imm_int(&b->nb, offset)),
+ stride);
vtn_push_nir_ssa(b, w[2], array_length);
}
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