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ATI CTM Guide v. 1.01

© 2006 Advanced Micro Devices, Inc.

38 Flow Control

INT_ADDR - Which of 32 constant integers to use for loop initialization (the red channel is used for iteration count,
green for aL initialization, and blue for aL increment).

JUMP_ADDR - Which instruction to jump to if conditions pass.

JUMP_GLOBAL -- Whether JUMP_ADDR is global, or if OFFSET_ADDR should be added to JUMP_ADDR.

3.5.4

Common Flow Control Statements

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Summary of Contents for ATI CTM

Page 1: ...ATI CTM Guide Technical Reference Manual Version 1 01...

Page 2: ...logo AMD Athlon AMD Opteron and combinations thereof AMD XXXX ATI and ATI product and product feature names are trademarks of Advanced Micro Devices Inc HyperTransport is a licensed trademark of the H...

Page 3: ...Processor Execution Unit Commands 10 2 2 2 Memory Controller Unit Commands 13 2 2 3 Conditional Output Unit Commands 21 Chapter 3 DPP Array Instruction Set Architecture 23 3 1 Instructions 23 3 2 Ins...

Page 4: ...E 40 3 6 2 ALU Non Transcendental Floating Point 41 3 6 3 ALU Transcendental Floating Point 42 3 6 4 Texture Floating Point 43 3 7 Errata 43 Chapter 4 DPP Application Binary Interface 45 4 1 Executabl...

Page 5: ...sor array found in ATI graphics hardware CTM consists of this processor array plus a handful of supporting components that control and feed the array This manual provides a programmatic overview of th...

Page 6: ...ATI CTM Guide v 1 01 2006 Advanced Micro Devices Inc 2 Related Documents...

Page 7: ...nents the Processor Execution Unit PE the Conditional Operation Unit CO and the Memory Contoller Unit MC Figure 2 1 CTM Block Diagram The PE reads commands sequentially from a specified area of memory...

Page 8: ...e CO then performs a conditional test based on the value and index pair If the test passes the processors dispatch l output write requests to the MC otherwise no output write requests are generated Th...

Page 9: ...or the test is a comparison between the conditional value v from a client to a value b read from a conditional output buffer residing in memory result v op b where op is one of or The conditional outp...

Page 10: ...ram inputs The x y index pair for a given request is specified in an instruction being executed on one of the processors The index pair is sent to the MC along with the program input identifier also s...

Page 11: ...st can be found in the MC conditional output cache then the MC will satisfy the request from the cache Otherwise it will pull data into the cache either from local or remote memory as appropriate in t...

Page 12: ...is a 32 bit unsigned integer It is followed immediately in memory by one or more parameters each of which is also a 32 bit unsigned integer No commands take a variable number of parameters and all co...

Page 13: ...offset pitch tiling and data format for the floating point constants set_consti_fmt x C0010F00 no 0 Base Address 1 Format Set the base address offset pitch tiling and data format for the integer const...

Page 14: ...ction 3 2 These are unsigned integers of a range given by the bits in use Parameter 0 i0 Conditional Output Unit Commands set_cond_test x C0001B00 yes 0 Condition Set the test the conditional output u...

Page 15: ...ll processors are idle processing of subsequent commands resumes 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 j0 Bits Field Name Description 11 0 j0 The j0 dom...

Page 16: ...ny enabled counters counting Parameter 0 Read Performance Counters Command The read_perf_counters command takes one parameter This command transfers the performance counters to an area in memory begin...

Page 17: ...ven in multiples of 4 the lowest two bits of the pitch must be zero The pitch tiling and data formats are used by the MC to calculate an address offset from an x y index pair as described in Section 2...

Page 18: ...rmation for the program data Parameter 0 base address 23 18 Reserved Reserved 26 24 format Data format possible values 0 UINT16_1 1 UINT8_4 2 FLOAT32_1 3 FLOAT32_2 4 FLOAT32_4 5 Reserved 31 27 Reserve...

Page 19: ...0 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 format t pitch Bits Field Name Description 1 0 Reserved Reserved 12 2 pitch The pitch in multiples of 4 15 13 Reserved...

Page 20: ...d Name Description 10 0 Reserved Reserved 31 11 base address The 2K aligned address at which the given input is located 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3...

Page 21: ...se address Bits Field Name Description 10 0 Reserved Reserved 31 11 base address The 2K aligned address at which the given output is located 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12...

Page 22: ...ght 31 13 Reserved Reserved 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 base address Bits Field Name Description 10 0 Reserved Reserved 31 11 base address The...

Page 23: ...commands all have the same form They take two parameters The first parameter is the base address for the corresponding constants in memory The second contains the corresponding pitch tiling and forma...

Page 24: ...30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 base address Bits Field Name Description 10 0 Reserved Reserved 31 11 base address The 2K aligned address at which th...

Page 25: ...nditional Output Unit CO Set Conditional Test Command The set_cond_test command takes a single parameter which specifies the test condition that the CO will perform This test is active until the next...

Page 26: ...ived Parameter 0 loc 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 cond Bits Field Name Description 2 0 condition Test Condition 0 Never always false 1 Less tru...

Page 27: ...t also be an OUTPUT instruction even if it s not outputting anything interesting The first OUTPUT instruction will reserve space in the output register fifo This space is limited therefore issuing an...

Page 28: ...tiple types It will process the three types ALU Output Texture and FC in parallel whenever possible Instructions need to be synchronized when an instruction of one type depends on the output of anothe...

Page 29: ...here is a special instruction the other engine can use to copy the result 3 3 1 Sources Each instruction can specify the addresses for 6 different sources 3 RGB vectors and 3 Alpha scalars Each source...

Page 30: ...he previous instruction is an ALU or output instruction a NOP needs to be inserted between the two instructions Do this by setting the NOP flag in the previous instruction so the NOP does not consume...

Page 31: ...e RGB selectors RGB_SEL_x and except for one case noted below the red RED_SWIZ_x green GREEN_SWIZ_x and blue BLUE_SWIZ_x swizzle selects The alpha unit always uses the alpha selectors ALPHA_SEL_x and...

Page 32: ...B_MAX OP_ALPHA_MAX A B A B Maximum of A and B OP_RGB_CND OP_ALPHA_CND C 0 5 A B OP_RGB_CMP OP_ALPHA_CMP C 0 A B OP_RGB_FRC OP_ALPHA_FRC A floor A floor A is the largest integer value less than or equa...

Page 33: ...de by 4 OMOD_D8 Divide by 8 OMOD_DISABLED No modification Each instruction can also be optionally clamped to the range 0 to 1 This happens after the above output modifier Disabling the Output Modifier...

Page 34: ...register Writemask Size Description RGB_WMASK 3 bits Write R G B to register destination ALPHA_WMASK 1 bit Write A to register destination RGB_OMASK 3 bits Write R G B to output or to predicate bits...

Page 35: ...reads If the program is reading back results written with uncached writes then the program should use one of the TEX_SEM_ACQUIRE choices to synchronize uncached writes and reads Additional information...

Page 36: ...ination temporary address 1 to 3 source temporary addresses a sampler ID and an opcode and control bits specifying how to lookup the texture As with ALU temporary addresses the loop variable aL may be...

Page 37: ...at that particular lookup and all prior lookups have completed before releasing the semaphore Therefore to protect several texture lookups you may set TEX_SEM_ACQUIRE only on the last texture lookup a...

Page 38: ...subroutine calls Partial flow control mode should be used unless the program requires branch statements nested more than 6 deep or the program requires loops or subroutines In CTM partial or full flo...

Page 39: ...CONTINUE instruction Each stack s size is dependent on whether the program is in partial or full flow control mode Stack overflows and underflows produce undefined behaviour in the hardware The stack...

Page 40: ...UNC 2x2x2 table indicating when to jump Bit 0 Jump when alu_result predicate boolean Bit 1 Jump when alu_result predicate boolean Bit 2 Jump when alu_result predicate boolean Bit 3 Jump when alu_resul...

Page 41: ...counter for inactive processors by amount in B_POP_CNT Activate processors which go negative FC_B_OP_INCR Increment branch counter for inactive processors by 1 Deactivate processors which disagree wit...

Page 42: ...o use for loop initialization the red channel is used for iteration count green for aL initialization and blue for aL increment JUMP_ADDR Which instruction to jump to if conditions pass JUMP_GLOBAL Wh...

Page 43: ...ENDIF 1 ENDIF 0x00 1 JUMP NONE DECR NONE 1 0 0 LOOP 0x00 0 LOOP NONE NONE NONE 0 0 ENDLOOP 1 ENDLOOP 0xff 1 ENDLOOP NONE NONE NONE 0 0 LOOP 1 REP 0x00 0 REP NONE NONE NONE 0 0 ENDREP 1 ENDREP 0xff 1 E...

Page 44: ...P NONE INCR DECR 2 0 ENDIF 1 ENDIF ENDIF ENDIF 0x00 1 JUMP NONE DECR NONE 3 0 0 3 6 Note on Floating Point X1K FP is designed to be compliant with the Shader Model 3 which does not officially support...

Page 45: ...lts but this will not have the desired effect for special values In IEEE an infinite value is equivalent to itself but NaN is never equivalent to NaN Yet infinity infinity NaN NaN NaN and the results...

Page 46: ...operations usually enable the output modifier which in turn standardizes NaN values and flushes denormal results to zero A MOV instruction which preserves the source bits may be implemented by setting...

Page 47: ...ution when generating very large values for use as coordinates in a texture lookup These values may generate infinite values when scaled by the texture dimensions or projected 3 7 Errata There is a pr...

Page 48: ...ATI CTM Guide v 1 01 2006 Advanced Micro Devices Inc 44 Errata...

Page 49: ...with ELF and details only the portions of the ELF file that are specific to loading programs for the DPP 4 1 1 File Format The top level layout of an executable file object the Execution View of the...

Page 50: ...mation Note is Name Type Flags Section Contents text SHT_PROGBITS SHF_ALLOC SHF_EXECINSTR The executable instructions of a program Note Description Program Information Ancillary information used by th...

Page 51: ...2_Word 0x00000000 Reserved Reserved Elf32_Word 0x00000000 Reserved Reserved Elf32_Word 0x00000000 Reserved Reserved Elf32_Word 0x00000000 Reserved Reserved Elf32_Word 0x00000000 Reserved Reserved Elf3...

Page 52: ...he Int32 Constants Note is summarized in the following table If an object file does not contain an Int32 constants note then the program loader acts as if the program has no int32 constant references...

Page 53: ...if the program has no early program exit command type 4 ELF_NOTE_ATI_INT32CONSTS current value is 6 name 8 ELF_NOTE_ATI current value is ATI DPP desc 4 nint32consts List of the int32 constant indices...

Page 54: ...ATI CTM Guide v 1 01 2006 Advanced Micro Devices Inc 50 Executable Files...

Page 55: ...2 amCommandBufferConsumed amCommandBufferConsumed AMmanagedDevice dev AMuint32 buf Submit a command buffer to a managed device This function submits a command buffer to a managed device The command b...

Page 56: ...Submit a command buffer to a managed device This function submits a command buffer to a managed device The command buffer location as a GPU address and size are passed in It returns a unique 32 bit u...

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