2 * Copyright (C) 2009 Nicolai Haehnle.
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial
16 * portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 #include "radeon_dataflow.h"
30 #include "radeon_compiler.h"
33 struct updatemask_state
{
34 unsigned char Output
[RC_REGISTER_MAX_INDEX
];
35 unsigned char Temporary
[RC_REGISTER_MAX_INDEX
];
36 unsigned char Address
;
37 unsigned char Special
[RC_NUM_SPECIAL_REGISTERS
];
40 struct instruction_state
{
41 unsigned char WriteMask
:4;
42 unsigned char WriteALUResult
:1;
43 unsigned char SrcReg
[3];
47 struct updatemask_state
* Breaks
;
48 unsigned int BreakCount
;
49 unsigned int BreaksReserved
;
53 unsigned int HaveElse
:1;
55 struct updatemask_state StoreEndif
;
56 struct updatemask_state StoreElse
;
59 struct deadcode_state
{
60 struct radeon_compiler
* C
;
61 struct instruction_state
* Instructions
;
63 struct updatemask_state R
;
65 struct branchinfo
* BranchStack
;
66 unsigned int BranchStackSize
;
67 unsigned int BranchStackReserved
;
69 struct loopinfo
* LoopStack
;
70 unsigned int LoopStackSize
;
71 unsigned int LoopStackReserved
;
75 static void or_updatemasks(
76 struct updatemask_state
* dst
,
77 struct updatemask_state
* a
,
78 struct updatemask_state
* b
)
80 for(unsigned int i
= 0; i
< RC_REGISTER_MAX_INDEX
; ++i
) {
81 dst
->Output
[i
] = a
->Output
[i
] | b
->Output
[i
];
82 dst
->Temporary
[i
] = a
->Temporary
[i
] | b
->Temporary
[i
];
85 for(unsigned int i
= 0; i
< RC_NUM_SPECIAL_REGISTERS
; ++i
)
86 dst
->Special
[i
] = a
->Special
[i
] | b
->Special
[i
];
88 dst
->Address
= a
->Address
| b
->Address
;
91 static void push_break(struct deadcode_state
*s
)
93 struct loopinfo
* loop
= &s
->LoopStack
[s
->LoopStackSize
- 1];
94 memory_pool_array_reserve(&s
->C
->Pool
, struct updatemask_state
,
95 loop
->Breaks
, loop
->BreakCount
, loop
->BreaksReserved
, 1);
97 memcpy(&loop
->Breaks
[loop
->BreakCount
++], &s
->R
, sizeof(s
->R
));
100 static void push_loop(struct deadcode_state
* s
)
102 memory_pool_array_reserve(&s
->C
->Pool
, struct loopinfo
, s
->LoopStack
,
103 s
->LoopStackSize
, s
->LoopStackReserved
, 1);
104 memset(&s
->LoopStack
[s
->LoopStackSize
++], 0, sizeof(struct loopinfo
));
107 static void push_branch(struct deadcode_state
* s
)
109 memory_pool_array_reserve(&s
->C
->Pool
, struct branchinfo
, s
->BranchStack
,
110 s
->BranchStackSize
, s
->BranchStackReserved
, 1);
112 struct branchinfo
* branch
= &s
->BranchStack
[s
->BranchStackSize
++];
113 branch
->HaveElse
= 0;
114 memcpy(&branch
->StoreEndif
, &s
->R
, sizeof(s
->R
));
117 static unsigned char * get_used_ptr(struct deadcode_state
*s
, rc_register_file file
, unsigned int index
)
119 if (file
== RC_FILE_OUTPUT
|| file
== RC_FILE_TEMPORARY
) {
120 if (index
>= RC_REGISTER_MAX_INDEX
) {
121 rc_error(s
->C
, "%s: index %i is out of bounds for file %i\n", __FUNCTION__
, index
, file
);
125 if (file
== RC_FILE_OUTPUT
)
126 return &s
->R
.Output
[index
];
128 return &s
->R
.Temporary
[index
];
129 } else if (file
== RC_FILE_ADDRESS
) {
130 return &s
->R
.Address
;
131 } else if (file
== RC_FILE_SPECIAL
) {
132 if (index
>= RC_NUM_SPECIAL_REGISTERS
) {
133 rc_error(s
->C
, "%s: special file index %i out of bounds\n", __FUNCTION__
, index
);
137 return &s
->R
.Special
[index
];
143 static void mark_used(struct deadcode_state
* s
, rc_register_file file
, unsigned int index
, unsigned int mask
)
145 unsigned char * pused
= get_used_ptr(s
, file
, index
);
150 static void update_instruction(struct deadcode_state
* s
, struct rc_instruction
* inst
)
152 const struct rc_opcode_info
* opcode
= rc_get_opcode_info(inst
->U
.I
.Opcode
);
153 struct instruction_state
* insts
= &s
->Instructions
[inst
->IP
];
154 unsigned int usedmask
= 0;
156 if (opcode
->HasDstReg
) {
157 unsigned char * pused
= get_used_ptr(s
, inst
->U
.I
.DstReg
.File
, inst
->U
.I
.DstReg
.Index
);
159 usedmask
= *pused
& inst
->U
.I
.DstReg
.WriteMask
;
160 if (!inst
->U
.I
.DstReg
.RelAddr
)
164 if (inst
->U
.I
.DstReg
.RelAddr
)
165 mark_used(s
, RC_FILE_ADDRESS
, 0, RC_MASK_X
);
168 insts
->WriteMask
|= usedmask
;
170 if (inst
->U
.I
.WriteALUResult
) {
171 unsigned char * pused
= get_used_ptr(s
, RC_FILE_SPECIAL
, RC_SPECIAL_ALU_RESULT
);
172 if (pused
&& *pused
) {
173 if (inst
->U
.I
.WriteALUResult
== RC_ALURESULT_X
)
174 usedmask
|= RC_MASK_X
;
175 else if (inst
->U
.I
.WriteALUResult
== RC_ALURESULT_W
)
176 usedmask
|= RC_MASK_W
;
179 insts
->WriteALUResult
= 1;
183 unsigned int srcmasks
[3];
184 rc_compute_sources_for_writemask(inst
, usedmask
, srcmasks
);
186 for(unsigned int src
= 0; src
< opcode
->NumSrcRegs
; ++src
) {
187 unsigned int refmask
= 0;
188 unsigned int newsrcmask
= srcmasks
[src
] & ~insts
->SrcReg
[src
];
189 insts
->SrcReg
[src
] |= newsrcmask
;
191 for(unsigned int chan
= 0; chan
< 4; ++chan
) {
192 if (GET_BIT(newsrcmask
, chan
))
193 refmask
|= 1 << GET_SWZ(inst
->U
.I
.SrcReg
[src
].Swizzle
, chan
);
196 /* get rid of spurious bits from ZERO, ONE, etc. swizzles */
197 refmask
&= RC_MASK_XYZW
;
202 mark_used(s
, inst
->U
.I
.SrcReg
[src
].File
, inst
->U
.I
.SrcReg
[src
].Index
, refmask
);
204 if (inst
->U
.I
.SrcReg
[src
].RelAddr
)
205 mark_used(s
, RC_FILE_ADDRESS
, 0, RC_MASK_X
);
209 static void mark_output_use(void * data
, unsigned int index
, unsigned int mask
)
211 struct deadcode_state
* s
= data
;
213 mark_used(s
, RC_FILE_OUTPUT
, index
, mask
);
216 void rc_dataflow_deadcode(struct radeon_compiler
* c
, rc_dataflow_mark_outputs_fn dce
, void * userdata
)
218 struct deadcode_state s
;
219 unsigned int nr_instructions
;
220 unsigned has_temp_reladdr_src
= 0;
222 memset(&s
, 0, sizeof(s
));
225 nr_instructions
= rc_recompute_ips(c
);
226 s
.Instructions
= memory_pool_malloc(&c
->Pool
, sizeof(struct instruction_state
)*nr_instructions
);
227 memset(s
.Instructions
, 0, sizeof(struct instruction_state
)*nr_instructions
);
229 dce(userdata
, &s
, &mark_output_use
);
231 for(struct rc_instruction
* inst
= c
->Program
.Instructions
.Prev
;
232 inst
!= &c
->Program
.Instructions
;
234 const struct rc_opcode_info
* opcode
= rc_get_opcode_info(inst
->U
.I
.Opcode
);
236 switch(opcode
->Opcode
){
237 /* Mark all sources in the loop body as used before doing
238 * normal deadcode analysis. This is probably not optimal.
240 case RC_OPCODE_ENDLOOP
:
243 struct rc_instruction
*ptr
;
244 for(ptr
= inst
->Prev
; endloops
> 0; ptr
= ptr
->Prev
){
245 opcode
= rc_get_opcode_info(ptr
->U
.I
.Opcode
);
246 if(ptr
->U
.I
.Opcode
== RC_OPCODE_BGNLOOP
){
250 if(ptr
->U
.I
.Opcode
== RC_OPCODE_ENDLOOP
){
254 if(opcode
->HasDstReg
){
256 unsigned int srcmasks
[3];
257 rc_compute_sources_for_writemask(ptr
,
258 ptr
->U
.I
.DstReg
.WriteMask
, srcmasks
);
259 for(src
=0; src
< opcode
->NumSrcRegs
; src
++){
261 ptr
->U
.I
.SrcReg
[src
].File
,
262 ptr
->U
.I
.SrcReg
[src
].Index
,
273 case RC_OPCODE_BGNLOOP
:
276 struct loopinfo
* loop
= &s
.LoopStack
[s
.LoopStackSize
-1];
277 for(i
= 0; i
< loop
->BreakCount
; i
++) {
278 or_updatemasks(&s
.R
, &s
.R
, &loop
->Breaks
[i
]);
284 case RC_OPCODE_ENDIF
:
288 if (opcode
->IsFlowControl
&& s
.BranchStackSize
) {
289 struct branchinfo
* branch
= &s
.BranchStack
[s
.BranchStackSize
-1];
290 if (opcode
->Opcode
== RC_OPCODE_IF
) {
293 branch
->HaveElse
? &branch
->StoreElse
: &branch
->StoreEndif
);
296 } else if (opcode
->Opcode
== RC_OPCODE_ELSE
) {
297 if (branch
->HaveElse
) {
298 rc_error(c
, "%s: Multiple ELSE for one IF/ENDIF\n", __FUNCTION__
);
300 memcpy(&branch
->StoreElse
, &s
.R
, sizeof(s
.R
));
301 memcpy(&s
.R
, &branch
->StoreEndif
, sizeof(s
.R
));
302 branch
->HaveElse
= 1;
305 rc_error(c
, "%s: Unhandled control flow instruction %s\n", __FUNCTION__
, opcode
->Name
);
309 if (!has_temp_reladdr_src
) {
310 for (unsigned i
= 0; i
< opcode
->NumSrcRegs
; i
++) {
311 if (inst
->U
.I
.SrcReg
[i
].File
== RC_FILE_TEMPORARY
&&
312 inst
->U
.I
.SrcReg
[i
].RelAddr
) {
313 /* If there is a register read from a temporary file with relative addressing,
314 * mark all preceding written registers as used. */
315 for (struct rc_instruction
*ptr
= inst
->Prev
;
316 ptr
!= &c
->Program
.Instructions
;
318 if (opcode
->HasDstReg
&&
319 ptr
->U
.I
.DstReg
.File
== RC_FILE_TEMPORARY
&&
320 ptr
->U
.I
.DstReg
.WriteMask
) {
322 ptr
->U
.I
.DstReg
.File
,
323 ptr
->U
.I
.DstReg
.Index
,
324 ptr
->U
.I
.DstReg
.WriteMask
);
328 has_temp_reladdr_src
= 1;
334 update_instruction(&s
, inst
);
338 for(struct rc_instruction
* inst
= c
->Program
.Instructions
.Next
;
339 inst
!= &c
->Program
.Instructions
;
340 inst
= inst
->Next
, ++ip
) {
341 const struct rc_opcode_info
* opcode
= rc_get_opcode_info(inst
->U
.I
.Opcode
);
344 if (!opcode
->HasDstReg
) {
347 inst
->U
.I
.DstReg
.WriteMask
= s
.Instructions
[ip
].WriteMask
;
348 if (s
.Instructions
[ip
].WriteMask
)
351 if (s
.Instructions
[ip
].WriteALUResult
)
354 inst
->U
.I
.WriteALUResult
= RC_ALURESULT_NONE
;
358 struct rc_instruction
* todelete
= inst
;
360 rc_remove_instruction(todelete
);
364 unsigned int srcmasks
[3];
365 unsigned int usemask
= s
.Instructions
[ip
].WriteMask
;
367 if (inst
->U
.I
.WriteALUResult
== RC_ALURESULT_X
)
368 usemask
|= RC_MASK_X
;
369 else if (inst
->U
.I
.WriteALUResult
== RC_ALURESULT_W
)
370 usemask
|= RC_MASK_W
;
372 rc_compute_sources_for_writemask(inst
, usemask
, srcmasks
);
374 for(unsigned int src
= 0; src
< 3; ++src
) {
375 for(unsigned int chan
= 0; chan
< 4; ++chan
) {
376 if (!GET_BIT(srcmasks
[src
], chan
))
377 SET_SWZ(inst
->U
.I
.SrcReg
[src
].Swizzle
, chan
, RC_SWIZZLE_UNUSED
);
382 rc_calculate_inputs_outputs(c
);