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nir: fix potential left shift of a negative value

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Fixes UBSan error:
src/compiler/nir/nir_constant_expressions.c:36573:32: runtime error: left shift of negative value -1

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6206>
This commit is contained in:
Rhys Perry
2020-08-05 21:03:31 +01:00
committed by Marge Bot
parent 391eeb7443
commit 27ec38d746
1 changed files with 1 additions and 1 deletions
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src/compiler/nir/nir_opcodes.py
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@@ -785,7 +785,7 @@ binop("sne", tfloat32, _2src_commutative, "(src0 != src1) ? 1.0f : 0.0f") # Set
# but SM5 shifts are defined to use the least significant bits, only
# The NIR definition is according to the SM5 specification.
opcode("ishl", 0, tint, [0, 0], [tint, tuint32], False, "",
"src0 << (src1 & (sizeof(src0) * 8 - 1))")
"(uint64_t)src0 << (src1 & (sizeof(src0) * 8 - 1))")
opcode("ishr", 0, tint, [0, 0], [tint, tuint32], False, "",
"src0 >> (src1 & (sizeof(src0) * 8 - 1))")
opcode("ushr", 0, tuint, [0, 0], [tuint, tuint32], False, "",