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vkd3d-shader/dxil: Allow returning signed types from vsir_data_type_from_dxil().

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We have a number of vsir operations which should take a signed type, but
which the DXIL parser currently emits unsigned types for. For example,
ISHR.

In the SPIR-V backend, we translate ISHR to OpShiftRightArithmetic,
which is specified as filling the most-significant bits of the result
with the sign bit of the "Base" operand. For an unsigned type, that
would technically be 0. In practice, implementations like radv/Mesa seem
to fill with the most-significant bit of the "Base" operand for unsigned
types, but arguably that could be considered a bug. Alternatively, the
wording in the specification is just unfortunate; SPIR-V does generally
take the position that signedness of operands should be irrelevant for
almost all operations. Either way, it seems best to avoid using
OpShiftRightArithmetic with unsigned types.

For a target like MSL, allowing ISHR to take an unsigned source operand
is just inconvenient; we'd have to introduce bitcasts to achieve the
desired behaviour, instead of simply using msl_binop().
This commit is contained in:
Henri Verbeet
2025-09-01 20:14:32 +02:00
parent db3aaeca17
commit 8700e3a5bd
Notes: Henri Verbeet 2025-09-16 16:19:58 +02:00 
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1727
3 changed files with 43 additions and 11 deletions
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1
libs/vkd3d-shader/ir.c
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@@ -53,6 +53,7 @@ const char *vsir_data_type_get_name(enum vsir_data_type t, const char *error)
[VSIR_DATA_F16 ] = "f16",
[VSIR_DATA_F32 ] = "f32",
[VSIR_DATA_F64 ] = "f64",
[VSIR_DATA_I8 ] = "i8",
[VSIR_DATA_I16 ] = "i16",
[VSIR_DATA_I32 ] = "i32",
[VSIR_DATA_I64 ] = "i64",