diff options
Diffstat (limited to 'src/mesa/shader')
| -rw-r--r-- | src/mesa/shader/prog_optimize.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/src/mesa/shader/prog_optimize.c b/src/mesa/shader/prog_optimize.c index b4658cb37f9..94d3dce6ea7 100644 --- a/src/mesa/shader/prog_optimize.c +++ b/src/mesa/shader/prog_optimize.c @@ -38,6 +38,39 @@ static GLboolean dbg = GL_FALSE; +/* Returns the mask of channels read from the given srcreg in this instruction. + */ +static GLuint +get_src_arg_mask(const struct prog_instruction *inst, int arg) +{ + int writemask = inst->DstReg.WriteMask; + + if (inst->CondUpdate) + writemask = WRITEMASK_XYZW; + + 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: + return WRITEMASK_XYZ; + default: + return WRITEMASK_XYZW; + } +} + /** * In 'prog' remove instruction[i] if removeFlags[i] == TRUE. * \return number of instructions removed @@ -217,6 +250,7 @@ _mesa_remove_dead_code(struct gl_program *prog) if (inst->SrcReg[j].File == PROGRAM_TEMPORARY) { const GLuint index = inst->SrcReg[j].Index; ASSERT(index < MAX_PROGRAM_TEMPS); + int read_mask = get_src_arg_mask(inst, j); if (inst->SrcReg[j].RelAddr) { if (dbg) @@ -227,6 +261,9 @@ _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) + continue; + switch (swz) { case SWIZZLE_X: tempRead[index][0] = GL_TRUE; @@ -396,6 +433,7 @@ _mesa_remove_extra_move_use(struct gl_program *prog) for (arg = 0; arg < _mesa_num_inst_src_regs(inst2->Opcode); arg++) { int comp; + int read_mask = get_src_arg_mask(inst2, arg); if (inst2->SrcReg[arg].File != mov->DstReg.File || inst2->SrcReg[arg].Index != mov->DstReg.Index || @@ -410,7 +448,8 @@ _mesa_remove_extra_move_use(struct gl_program *prog) int src_swz = GET_SWZ(inst2->SrcReg[arg].Swizzle, comp); /* If the MOV didn't write that channel, can't use it. */ - if (src_swz <= SWIZZLE_W && + if ((read_mask & (1 << comp)) && + src_swz <= SWIZZLE_W && (mov->DstReg.WriteMask & (1 << src_swz)) == 0) break; } |