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vkd3d-shader/d3dbc: Use the actual instruction length in d3dbc_write_instruction().

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The current calculation doesn't take indirect addressing into account.
This issue is easy to spot in disassembly, when we don't skip correctly
to the next instruction. On Windows the disassembler does not depend on
this it seems and skips naturally after processing all parameters that
may or may not use indirect addressing.

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
This commit is contained in:
Nikolay Sivov
2025-06-12 10:39:41 +02:00
committed by Henri Verbeet
parent 7281f4ed39
commit d08673bad1
Notes: Henri Verbeet 2025-06-16 17:49:21 +02:00 
Approved-by: Francisco Casas (@fcasas)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1571
1 changed files with 10 additions and 3 deletions
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13
libs/vkd3d-shader/d3dbc.c
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@@ -1830,6 +1830,7 @@ static void d3dbc_write_instruction(struct d3dbc_compiler *d3dbc, const struct v
struct vkd3d_bytecode_buffer *buffer = &d3dbc->buffer;
const struct vkd3d_shader_src_param *src;
const struct vkd3d_sm1_opcode_info *info;
size_t size, token_position;
unsigned int i;
uint32_t token;
@@ -1842,9 +1843,7 @@ static void d3dbc_write_instruction(struct d3dbc_compiler *d3dbc, const struct v
token = info->sm1_opcode;
token |= VKD3D_SM1_INSTRUCTION_FLAGS_MASK & (ins->flags << VKD3D_SM1_INSTRUCTION_FLAGS_SHIFT);
if (version->major > 1)
token |= (ins->dst_count + ins->src_count) << VKD3D_SM1_INSTRUCTION_LENGTH_SHIFT;
put_u32(buffer, token);
token_position = put_u32(buffer, 0);
for (i = 0; i < ins->dst_count; ++i)
{
@@ -1864,6 +1863,14 @@ static void d3dbc_write_instruction(struct d3dbc_compiler *d3dbc, const struct v
if (src->reg.idx_count && src->reg.idx[0].rel_addr)
write_sm1_src_register(buffer, src->reg.idx[0].rel_addr);
}
if (version->major > 1)
{
size = (bytecode_get_size(buffer) - token_position) / sizeof(uint32_t);
token |= ((size - 1) << VKD3D_SM1_INSTRUCTION_LENGTH_SHIFT);
}
set_u32(buffer, token_position, token);
};
static void d3dbc_write_texkill(struct d3dbc_compiler *d3dbc, const struct vkd3d_shader_instruction *ins)