diff options
| author | Kenneth Graunke <[email protected]> | 2014-10-15 18:57:07 -0700 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2014-10-21 21:13:37 -0700 |
| commit | 4d34c4b5823de984fb8f0469b67c6b4be02030b2 (patch) | |
| tree | c13d3d48970d99c286949b7b1c303da18ecee64e /src/mesa/drivers/dri | |
| parent | 32364a1fe58a09914daf4eef96674969167665d7 (diff) | |
i965/fs: Generate better code for ir_triop_csel.
Previously, we generated an extra CMP instruction:
cmp.ge.f0(8) g4<1>D g2<0,1,0>F 0F
cmp.nz.f0(8) null g4<8,8,1>D 0D
(+f0) sel(8) g120<1>F g2.4<0,1,0>F g3<0,1,0>F
The first operand is always a boolean, and we want to predicate the SEL
on that. Rather than producing a boolean value and comparing it against
zero, we can just produce a condition code in the flag register.
Now we generate:
cmp.ge.f0(8) null g2<0,1,0>F 0F
(+f0) sel(8) g124<1>F g2.4<0,1,0>F g3<0,1,0>F
total instructions in shared programs: 5473459 -> 5473253 (-0.00%)
instructions in affected programs: 6219 -> 6013 (-3.31%)
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Diffstat (limited to 'src/mesa/drivers/dri')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp index 541c25a9a07..3fc9e39484a 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp @@ -487,6 +487,19 @@ fs_visitor::visit(ir_expression *ir) return; break; + case ir_triop_csel: + ir->operands[1]->accept(this); + op[1] = this->result; + ir->operands[2]->accept(this); + op[2] = this->result; + + emit_bool_to_cond_code(ir->operands[0]); + + this->result = fs_reg(this, ir->type); + inst = emit(SEL(this->result, op[1], op[2])); + inst->predicate = BRW_PREDICATE_NORMAL; + return; + case ir_unop_interpolate_at_centroid: case ir_binop_interpolate_at_offset: case ir_binop_interpolate_at_sample: @@ -1023,11 +1036,6 @@ fs_visitor::visit(ir_expression *ir) break; case ir_triop_csel: - emit(CMP(reg_null_d, op[0], fs_reg(0), BRW_CONDITIONAL_NZ)); - inst = emit(BRW_OPCODE_SEL, this->result, op[1], op[2]); - inst->predicate = BRW_PREDICATE_NORMAL; - break; - case ir_unop_interpolate_at_centroid: case ir_binop_interpolate_at_offset: case ir_binop_interpolate_at_sample: |