diff options
author | Benjamin Segovia <[email protected]> | 2010-08-13 10:36:47 -0600 |
---|---|---|
committer | Brian Paul <[email protected]> | 2010-08-13 15:59:25 -0600 |
commit | 9021c56a5738815777f27c39b63637b5975270c6 (patch) | |
tree | 22ebdf6b578ff386fbfdbee0ec7b2687a27c0fa2 /src/mesa/program/prog_optimize.c | |
parent | 5c0a0f219843fa283a0fd98dbe0544e8ea820c60 (diff) |
mesa: more/better program optimizations
This is the patch from Benjamin's Aug 11, 2010 email with minor fixes
(such as moving declarations before code)
Signed-off-by: Brian Paul <[email protected]>
Diffstat (limited to 'src/mesa/program/prog_optimize.c')
-rw-r--r-- | src/mesa/program/prog_optimize.c | 604 |
1 files changed, 385 insertions, 219 deletions
diff --git a/src/mesa/program/prog_optimize.c b/src/mesa/program/prog_optimize.c index 2941a17da3f..6ca4d87e3eb 100644 --- a/src/mesa/program/prog_optimize.c +++ b/src/mesa/program/prog_optimize.c @@ -38,38 +38,103 @@ static GLboolean dbg = GL_FALSE; -/* Returns the mask of channels read from the given srcreg in this instruction. +#define NO_MASK 0xf + +/** Returns the mask of channels read from the given src in this instruction, We + * also provide one optional masks which may mask other components in the dst + * register */ static GLuint -get_src_arg_mask(const struct prog_instruction *inst, int arg) +get_src_arg_mask(const struct prog_instruction *inst, int arg, int dst_mask) { - int writemask = inst->DstReg.WriteMask; + int read_mask, channel_mask; + int comp; + ASSERT(arg < _mesa_num_inst_src_regs(inst->Opcode)); - if (inst->CondUpdate) - writemask = WRITEMASK_XYZW; + /* Form the dst register, find the written channels */ + if (inst->CondUpdate) { + channel_mask = WRITEMASK_XYZW; + } + else { + switch (inst->Opcode) { + case OPCODE_MOV: + case OPCODE_MIN: + case OPCODE_MAX: + case OPCODE_ABS: + case OPCODE_ADD: + case OPCODE_MAD: + case OPCODE_MUL: + case OPCODE_SUB: + channel_mask = inst->DstReg.WriteMask & dst_mask; + break; + case OPCODE_RCP: + case OPCODE_SIN: + case OPCODE_COS: + case OPCODE_RSQ: + case OPCODE_POW: + case OPCODE_EX2: + case OPCODE_LOG: + channel_mask = WRITEMASK_X; + break; + case OPCODE_DP2: + channel_mask = WRITEMASK_XY; + break; + case OPCODE_DP3: + case OPCODE_XPD: + channel_mask = WRITEMASK_XYZ; + break; + default: + channel_mask = WRITEMASK_XYZW; + break; + } + } - switch (inst->Opcode) { - case OPCODE_MOV: - case OPCODE_ABS: - case OPCODE_ADD: - case OPCODE_MUL: - case OPCODE_SUB: - return writemask; - case OPCODE_RCP: - case OPCODE_SIN: - case OPCODE_COS: - case OPCODE_RSQ: - case OPCODE_POW: - case OPCODE_EX2: - return WRITEMASK_X; - case OPCODE_DP2: - return WRITEMASK_XY; - case OPCODE_DP3: - case OPCODE_XPD: - return WRITEMASK_XYZ; - default: - return WRITEMASK_XYZW; + /* Now, given the src swizzle and the written channels, find which + * components are actually read + */ + read_mask = 0; + for (comp = 0; comp < 4; ++comp) { + const int coord = GET_SWZ(inst->SrcReg[arg].Swizzle, comp); + ASSERT(coord < 4); + if (channel_mask & (1 << comp) && coord <= SWIZZLE_W) + read_mask |= 1 << coord; } + + return read_mask; +} + +/** For a MOV instruction, compute a write mask when src register also has + * a mask + */ +static GLuint +get_dst_mask_for_mov(const struct prog_instruction *mov, int src_mask) +{ + const int mask = mov->DstReg.WriteMask; + int comp; + int updated_mask = 0; + ASSERT(mov->Opcode == OPCODE_MOV); + + for (comp = 0; comp < 4; ++comp) { + int src_comp; + if ((mask & (1 << comp)) == 0) + continue; + src_comp = GET_SWZ(mov->SrcReg[0].Swizzle, comp); + if ((src_mask & (1 << src_comp)) == 0) + continue; + updated_mask |= 1 << comp; + } + + return updated_mask; +} + +/** Ensure that the swizzle is regular */ +static int +is_swizzle_regular(int swz) +{ + return GET_SWZ(swz,0) <= SWIZZLE_W && + GET_SWZ(swz,1) <= SWIZZLE_W && + GET_SWZ(swz,2) <= SWIZZLE_W && + GET_SWZ(swz,3) <= SWIZZLE_W; } /** @@ -146,84 +211,14 @@ replace_regs(struct gl_program *prog, gl_register_file file, const GLint map[]) } } - -/** - * Consolidate temporary registers to use low numbers. For example, if the - * shader only uses temps 4, 5, 8, replace them with 0, 1, 2. - */ -static void -_mesa_consolidate_registers(struct gl_program *prog) -{ - GLboolean tempUsed[MAX_PROGRAM_TEMPS]; - GLint tempMap[MAX_PROGRAM_TEMPS]; - GLuint tempMax = 0, i; - - if (dbg) { - printf("Optimize: Begin register consolidation\n"); - } - - memset(tempUsed, 0, sizeof(tempUsed)); - - for (i = 0; i < MAX_PROGRAM_TEMPS; i++) { - tempMap[i] = -1; - } - - /* set tempUsed[i] if temporary [i] is referenced */ - for (i = 0; i < prog->NumInstructions; i++) { - const struct prog_instruction *inst = prog->Instructions + i; - const GLuint numSrc = _mesa_num_inst_src_regs(inst->Opcode); - GLuint j; - for (j = 0; j < numSrc; j++) { - if (inst->SrcReg[j].File == PROGRAM_TEMPORARY) { - const GLuint index = inst->SrcReg[j].Index; - ASSERT(index < MAX_PROGRAM_TEMPS); - tempUsed[index] = GL_TRUE; - tempMax = MAX2(tempMax, index); - break; - } - } - if (inst->DstReg.File == PROGRAM_TEMPORARY) { - const GLuint index = inst->DstReg.Index; - ASSERT(index < MAX_PROGRAM_TEMPS); - tempUsed[index] = GL_TRUE; - tempMax = MAX2(tempMax, index); - } - } - - /* allocate a new index for each temp that's used */ - { - GLuint freeTemp = 0; - for (i = 0; i <= tempMax; i++) { - if (tempUsed[i]) { - tempMap[i] = freeTemp++; - /*printf("replace %u with %u\n", i, tempMap[i]);*/ - } - } - if (freeTemp == tempMax + 1) { - /* no consolidation possible */ - return; - } - if (dbg) { - printf("Replace regs 0..%u with 0..%u\n", tempMax, freeTemp-1); - } - } - - replace_regs(prog, PROGRAM_TEMPORARY, tempMap); - - if (dbg) { - printf("Optimize: End register consolidation\n"); - } -} - - /** * Remove dead instructions from the given program. * This is very primitive for now. Basically look for temp registers * that are written to but never read. Remove any instructions that * write to such registers. Be careful with condition code setters. */ -static void -_mesa_remove_dead_code(struct gl_program *prog) +static GLboolean +_mesa_remove_dead_code_global(struct gl_program *prog) { GLboolean tempRead[MAX_PROGRAM_TEMPS][4]; GLboolean *removeInst; /* per-instruction removal flag */ @@ -251,7 +246,7 @@ _mesa_remove_dead_code(struct gl_program *prog) const GLuint index = inst->SrcReg[j].Index; GLuint read_mask; ASSERT(index < MAX_PROGRAM_TEMPS); - read_mask = get_src_arg_mask(inst, j); + read_mask = get_src_arg_mask(inst, j, NO_MASK); if (inst->SrcReg[j].RelAddr) { if (dbg) @@ -260,25 +255,12 @@ _mesa_remove_dead_code(struct gl_program *prog) } for (comp = 0; comp < 4; comp++) { - GLuint swz = (inst->SrcReg[j].Swizzle >> (3 * comp)) & 0x7; - - if ((read_mask & (1 << comp)) == 0) + const GLuint swz = GET_SWZ(inst->SrcReg[j].Swizzle, comp); + ASSERT(swz < 4); + if ((read_mask & (1 << swz)) == 0) continue; - - switch (swz) { - case SWIZZLE_X: - tempRead[index][0] = GL_TRUE; - break; - case SWIZZLE_Y: - tempRead[index][1] = GL_TRUE; - break; - case SWIZZLE_Z: - tempRead[index][2] = GL_TRUE; - break; - case SWIZZLE_W: - tempRead[index][3] = GL_TRUE; - break; - } + if (swz <= SWIZZLE_W) + tempRead[index][swz] = GL_TRUE; } } } @@ -348,10 +330,11 @@ _mesa_remove_dead_code(struct gl_program *prog) done: free(removeInst); + return rem != 0; } -enum temp_use +enum inst_use { READ, WRITE, @@ -360,12 +343,17 @@ enum temp_use }; /** - * Scan forward in program from 'start' for the next occurance of TEMP[index]. + * Scan forward in program from 'start' for the next occurances of TEMP[index]. + * We look if an instruction reads the component given by the masks and if they + * are overwritten. * Return READ, WRITE, FLOW or END to indicate the next usage or an indicator * that we can't look further. */ -static enum temp_use -find_next_temp_use(const struct gl_program *prog, GLuint start, GLuint index) +static enum inst_use +find_next_use(const struct gl_program *prog, + GLuint start, + GLuint index, + GLuint mask) { GLuint i; @@ -373,26 +361,40 @@ find_next_temp_use(const struct gl_program *prog, GLuint start, GLuint index) const struct prog_instruction *inst = prog->Instructions + i; switch (inst->Opcode) { case OPCODE_BGNLOOP: - case OPCODE_ENDLOOP: case OPCODE_BGNSUB: + case OPCODE_BRA: + case OPCODE_CAL: + case OPCODE_CONT: + case OPCODE_IF: + case OPCODE_ELSE: + case OPCODE_ENDIF: + case OPCODE_ENDLOOP: case OPCODE_ENDSUB: + case OPCODE_RET: return FLOW; + case OPCODE_END: + return END; default: { const GLuint numSrc = _mesa_num_inst_src_regs(inst->Opcode); GLuint j; for (j = 0; j < numSrc; j++) { - if (inst->SrcReg[j].File == PROGRAM_TEMPORARY && - inst->SrcReg[j].Index == index) + if (inst->SrcReg[j].RelAddr || + (inst->SrcReg[j].File == PROGRAM_TEMPORARY && + inst->SrcReg[j].Index == index && + (get_src_arg_mask(inst,j,NO_MASK) & mask))) return READ; } - if (inst->DstReg.File == PROGRAM_TEMPORARY && - inst->DstReg.Index == index) - return WRITE; + if (_mesa_num_inst_dst_regs(inst->Opcode) == 1 && + inst->DstReg.File == PROGRAM_TEMPORARY && + inst->DstReg.Index == index) { + mask &= ~inst->DstReg.WriteMask; + if (mask == 0) + return WRITE; + } } } } - return END; } @@ -417,6 +419,30 @@ static GLboolean _mesa_is_flow_control_opcode(enum prog_opcode opcode) } } +static GLboolean +can_downward_mov_be_modifed(const struct prog_instruction *mov) +{ + return + mov->Opcode == OPCODE_MOV && + mov->CondUpdate == GL_FALSE && + mov->SrcReg[0].RelAddr == 0 && + mov->SrcReg[0].Negate == 0 && + mov->SrcReg[0].Abs == 0 && + mov->SrcReg[0].HasIndex2 == 0 && + mov->SrcReg[0].RelAddr2 == 0 && + mov->DstReg.RelAddr == 0 && + mov->DstReg.CondMask == COND_TR && + mov->SaturateMode == SATURATE_OFF; +} + +static GLboolean +can_upward_mov_be_modifed(const struct prog_instruction *mov) +{ + return + can_downward_mov_be_modifed(mov) && + mov->DstReg.File == PROGRAM_TEMPORARY; +} + /** * Try to remove use of extraneous MOV instructions, to free them up for dead * code removal. @@ -444,14 +470,15 @@ _mesa_remove_extra_move_use(struct gl_program *prog) for (i = 0; i + 1 < prog->NumInstructions; i++) { const struct prog_instruction *mov = prog->Instructions + i; + int dst_mask, src_mask; + if (can_upward_mov_be_modifed(mov) == GL_FALSE) + continue; - if (mov->Opcode != OPCODE_MOV || - mov->DstReg.File != PROGRAM_TEMPORARY || - mov->DstReg.RelAddr || - mov->DstReg.CondMask != COND_TR || - mov->SaturateMode != SATURATE_OFF || - mov->SrcReg[0].RelAddr) - continue; + /* Scanning the code, we maintain the components which are still active in + * these two masks + */ + dst_mask = mov->DstReg.WriteMask; + src_mask = get_src_arg_mask(mov, 0, NO_MASK); /* Walk through remaining instructions until the or src reg gets * rewritten or we get into some flow-control, eliminating the use of @@ -459,61 +486,60 @@ _mesa_remove_extra_move_use(struct gl_program *prog) */ for (j = i + 1; j < prog->NumInstructions; j++) { struct prog_instruction *inst2 = prog->Instructions + j; - GLuint arg; + GLuint arg; if (_mesa_is_flow_control_opcode(inst2->Opcode)) break; /* First rewrite this instruction's args if appropriate. */ for (arg = 0; arg < _mesa_num_inst_src_regs(inst2->Opcode); arg++) { - int comp; - int read_mask = get_src_arg_mask(inst2, arg); + int comp, read_mask; if (inst2->SrcReg[arg].File != mov->DstReg.File || inst2->SrcReg[arg].Index != mov->DstReg.Index || inst2->SrcReg[arg].RelAddr || inst2->SrcReg[arg].Abs) continue; + read_mask = get_src_arg_mask(inst2, arg, NO_MASK); - /* Check that all the sources for this arg of inst2 come from inst1 - * or constants. - */ - for (comp = 0; comp < 4; comp++) { - int src_swz = GET_SWZ(inst2->SrcReg[arg].Swizzle, comp); - - /* If the MOV didn't write that channel, can't use it. */ - if ((read_mask & (1 << comp)) && - src_swz <= SWIZZLE_W && - (mov->DstReg.WriteMask & (1 << src_swz)) == 0) - break; - } - if (comp != 4) - continue; - - /* Adjust the swizzles of inst2 to point at MOV's source */ - for (comp = 0; comp < 4; comp++) { - int inst2_swz = GET_SWZ(inst2->SrcReg[arg].Swizzle, comp); - - if (inst2_swz <= SWIZZLE_W) { - GLuint s = GET_SWZ(mov->SrcReg[0].Swizzle, inst2_swz); - inst2->SrcReg[arg].Swizzle &= ~(7 << (3 * comp)); - inst2->SrcReg[arg].Swizzle |= s << (3 * comp); - inst2->SrcReg[arg].Negate ^= (((mov->SrcReg[0].Negate >> - inst2_swz) & 0x1) << comp); - } - } - inst2->SrcReg[arg].File = mov->SrcReg[0].File; - inst2->SrcReg[arg].Index = mov->SrcReg[0].Index; + /* Adjust the swizzles of inst2 to point at MOV's source if ALL the + * components read still come from the mov instructions + */ + if(is_swizzle_regular(inst2->SrcReg[arg].Swizzle) && + (read_mask & dst_mask) == read_mask) { + for (comp = 0; comp < 4; comp++) { + int inst2_swz = GET_SWZ(inst2->SrcReg[arg].Swizzle, comp); + + GLuint s = GET_SWZ(mov->SrcReg[0].Swizzle, inst2_swz); + inst2->SrcReg[arg].Swizzle &= ~(7 << (3 * comp)); + inst2->SrcReg[arg].Swizzle |= s << (3 * comp); + inst2->SrcReg[arg].Negate ^= (((mov->SrcReg[0].Negate >> + inst2_swz) & 0x1) << comp); + } + inst2->SrcReg[arg].File = mov->SrcReg[0].File; + inst2->SrcReg[arg].Index = mov->SrcReg[0].Index; + } } - /* If this instruction overwrote part of the move, our time is up. */ - if ((inst2->DstReg.File == mov->DstReg.File && - (inst2->DstReg.RelAddr || - inst2->DstReg.Index == mov->DstReg.Index)) || - (inst2->DstReg.File == mov->SrcReg[0].File && - (inst2->DstReg.RelAddr || - inst2->DstReg.Index == mov->SrcReg[0].Index))) - break; + /* The source of MOV is written. This potentially deactivates some + * components from the src and dst of the MOV instruction + */ + if (inst2->DstReg.File == mov->DstReg.File && + (inst2->DstReg.RelAddr || + inst2->DstReg.Index == mov->DstReg.Index)) { + dst_mask &= ~inst2->DstReg.WriteMask; + src_mask = get_src_arg_mask(mov, 0, dst_mask); + } + + /* Idem when the destination of mov is written */ + if (inst2->DstReg.File == mov->SrcReg[0].File && + (inst2->DstReg.RelAddr || + inst2->DstReg.Index == mov->SrcReg[0].Index)) { + src_mask &= ~inst2->DstReg.WriteMask; + dst_mask &= get_dst_mask_for_mov(mov, src_mask); + } + if (dst_mask == 0) + break; } } @@ -524,13 +550,147 @@ _mesa_remove_extra_move_use(struct gl_program *prog) } /** + * Complements dead_code_global. Try to remove code in block of code by + * carefully monitoring the swizzles. Both functions should be merged into one + * with a proper control flow graph + */ +static GLboolean +_mesa_remove_dead_code_local(struct gl_program *prog) +{ + GLboolean *removeInst; + GLuint i, arg, rem = 0; + + removeInst = (GLboolean *) + calloc(1, prog->NumInstructions * sizeof(GLboolean)); + + for (i = 0; i < prog->NumInstructions; i++) { + const struct prog_instruction *inst = prog->Instructions + i; + const GLuint index = inst->DstReg.Index; + const GLuint mask = inst->DstReg.WriteMask; + enum inst_use use; + + /* We must deactivate the pass as soon as some indirection is used */ + if (inst->DstReg.RelAddr) + goto done; + for (arg = 0; arg < _mesa_num_inst_src_regs(inst->Opcode); arg++) + if (inst->SrcReg[arg].RelAddr) + goto done; + + if (_mesa_is_flow_control_opcode(inst->Opcode) || + _mesa_num_inst_dst_regs(inst->Opcode) == 0 || + inst->DstReg.File != PROGRAM_TEMPORARY || + inst->DstReg.RelAddr) + continue; + + use = find_next_use(prog, i+1, index, mask); + if (use == WRITE || use == END) + removeInst[i] = GL_TRUE; + } + + rem = remove_instructions(prog, removeInst); + +done: + free(removeInst); + return rem != 0; +} + +/** + * Try to inject the destination of mov as the destination of inst and recompute + * the swizzles operators for the sources of inst if required. Return GL_TRUE + * of the substitution was possible, GL_FALSE otherwise + */ +static GLboolean +_mesa_merge_mov_into_inst(struct prog_instruction *inst, + const struct prog_instruction *mov) +{ + /* Indirection table which associates destination and source components for + * the mov instruction + */ + const GLuint mask = get_src_arg_mask(mov, 0, NO_MASK); + + /* Some components are not written by inst. We cannot remove the mov */ + if (mask != (inst->DstReg.WriteMask & mask)) + return GL_FALSE; + + /* Depending on the instruction, we may need to recompute the swizzles. + * Also, some other instructions (like TEX) are not linear. We will only + * consider completely active sources and destinations + */ + switch (inst->Opcode) { + + /* Carstesian instructions: we compute the swizzle */ + case OPCODE_MOV: + case OPCODE_MIN: + case OPCODE_MAX: + case OPCODE_ABS: + case OPCODE_ADD: + case OPCODE_MAD: + case OPCODE_MUL: + case OPCODE_SUB: + { + int dst_to_src_comp[4] = {0,0,0,0}; + int dst_comp, arg; + for (dst_comp = 0; dst_comp < 4; ++dst_comp) { + if (mov->DstReg.WriteMask & (1 << dst_comp)) { + const int src_comp = GET_SWZ(mov->SrcReg[0].Swizzle, dst_comp); + ASSERT(src_comp < 4); + dst_to_src_comp[dst_comp] = src_comp; + } + } + + /* Patch each source of the instruction */ + for (arg = 0; arg < _mesa_num_inst_src_regs(inst->Opcode); arg++) { + const int arg_swz = inst->SrcReg[arg].Swizzle; + inst->SrcReg[arg].Swizzle = 0; + + /* Reset each active component of the swizzle */ + for (dst_comp = 0; dst_comp < 4; ++dst_comp) { + int src_comp, arg_comp; + if ((mov->DstReg.WriteMask & (1 << dst_comp)) == 0) + continue; + src_comp = dst_to_src_comp[dst_comp]; + ASSERT(src_comp < 4); + arg_comp = GET_SWZ(arg_swz, src_comp); + ASSERT(arg_comp < 4); + inst->SrcReg[arg].Swizzle |= arg_comp << (3*dst_comp); + } + } + inst->DstReg = mov->DstReg; + return GL_TRUE; + } + + /* Dot products and scalar instructions: we only change the destination */ + case OPCODE_RCP: + case OPCODE_SIN: + case OPCODE_COS: + case OPCODE_RSQ: + case OPCODE_POW: + case OPCODE_EX2: + case OPCODE_LOG: + case OPCODE_DP2: + case OPCODE_DP3: + case OPCODE_DP4: + inst->DstReg = mov->DstReg; + return GL_TRUE; + + /* All other instructions require fully active components with no swizzle */ + default: + if (mov->SrcReg[0].Swizzle != SWIZZLE_XYZW || + inst->DstReg.WriteMask != WRITEMASK_XYZW) + return GL_FALSE; + inst->DstReg = mov->DstReg; + return GL_TRUE; + } +} + +/** * Try to remove extraneous MOV instructions from the given program. */ -static void +static GLboolean _mesa_remove_extra_moves(struct gl_program *prog) { GLboolean *removeInst; /* per-instruction removal flag */ - GLuint i, rem, loopNesting = 0, subroutineNesting = 0; + GLuint i, rem = 0, nesting = 0; if (dbg) { printf("Optimize: Begin remove extra moves\n"); @@ -549,29 +709,24 @@ _mesa_remove_extra_moves(struct gl_program *prog) */ for (i = 0; i < prog->NumInstructions; i++) { - const struct prog_instruction *inst = prog->Instructions + i; + const struct prog_instruction *mov = prog->Instructions + i; - switch (inst->Opcode) { + switch (mov->Opcode) { case OPCODE_BGNLOOP: - loopNesting++; - break; - case OPCODE_ENDLOOP: - loopNesting--; - break; case OPCODE_BGNSUB: - subroutineNesting++; + case OPCODE_IF: + nesting++; break; + case OPCODE_ENDLOOP: case OPCODE_ENDSUB: - subroutineNesting--; + case OPCODE_ENDIF: + nesting--; break; case OPCODE_MOV: - if (i > 0 && - loopNesting == 0 && - subroutineNesting == 0 && - inst->SrcReg[0].File == PROGRAM_TEMPORARY && - inst->SrcReg[0].Swizzle == SWIZZLE_XYZW) { + if (i > 0 && can_downward_mov_be_modifed(mov) && nesting == 0) { + /* see if this MOV can be removed */ - const GLuint tempIndex = inst->SrcReg[0].Index; + const GLuint id = mov->SrcReg[0].Index; struct prog_instruction *prevInst; GLuint prevI; @@ -582,11 +737,13 @@ _mesa_remove_extra_moves(struct gl_program *prog) prevInst = prog->Instructions + prevI; if (prevInst->DstReg.File == PROGRAM_TEMPORARY && - prevInst->DstReg.Index == tempIndex && - prevInst->DstReg.WriteMask == WRITEMASK_XYZW) { + prevInst->DstReg.Index == id && + prevInst->DstReg.RelAddr == 0 && + prevInst->DstReg.CondSrc == 0 && + prevInst->DstReg.CondMask == COND_TR) { - enum temp_use next_use = - find_next_temp_use(prog, i + 1, tempIndex); + const GLuint dst_mask = prevInst->DstReg.WriteMask; + enum inst_use next_use = find_next_use(prog, i+1, id, dst_mask); if (next_use == WRITE || next_use == END) { /* OK, we can safely remove this MOV instruction. @@ -596,18 +753,13 @@ _mesa_remove_extra_moves(struct gl_program *prog) * Into: * prevI: FOO z, x, y; */ - - /* patch up prev inst */ - prevInst->DstReg.File = inst->DstReg.File; - prevInst->DstReg.Index = inst->DstReg.Index; - - /* flag this instruction for removal */ - removeInst[i] = GL_TRUE; - - if (dbg) { - printf("Remove MOV at %u\n", i); - printf("new prev inst %u: ", prevI); - _mesa_print_instruction(prevInst); + if (_mesa_merge_mov_into_inst(prevInst, mov)) { + removeInst[i] = GL_TRUE; + if (dbg) { + printf("Remove MOV at %u\n", i); + printf("new prev inst %u: ", prevI); + _mesa_print_instruction(prevInst); + } } } } @@ -627,6 +779,8 @@ _mesa_remove_extra_moves(struct gl_program *prog) printf("Optimize: End remove extra moves. %u instructions removed\n", rem); /*_mesa_print_program(prog);*/ } + + return rem != 0; } @@ -1012,6 +1166,15 @@ _mesa_reallocate_registers(struct gl_program *prog) } } +#if 0 +static void +print_it(GLcontext *ctx, struct gl_program *program, const char *txt) { + fprintf(stderr, "%s (%u inst):\n", txt, program->NumInstructions); + _mesa_print_program(program); + _mesa_print_program_parameters(ctx, program); + fprintf(stderr, "\n\n"); +} +#endif /** * Apply optimizations to the given program to eliminate unnecessary @@ -1020,16 +1183,19 @@ _mesa_reallocate_registers(struct gl_program *prog) void _mesa_optimize_program(GLcontext *ctx, struct gl_program *program) { - _mesa_remove_extra_move_use(program); - - if (1) - _mesa_remove_dead_code(program); - - if (0) /* not tested much yet */ - _mesa_remove_extra_moves(program); - - if (0) - _mesa_consolidate_registers(program); - else + GLboolean any_change; + + /* Stop when no modifications were output */ + do { + any_change = GL_FALSE; + _mesa_remove_extra_move_use(program); + if (_mesa_remove_dead_code_global(program)) + any_change = GL_TRUE; + if (_mesa_remove_extra_moves(program)) + any_change = GL_TRUE; + if (_mesa_remove_dead_code_local(program)) + any_change = GL_TRUE; _mesa_reallocate_registers(program); + } while (any_change); } + |