diff options
| author | Francisco Jerez <[email protected]> | 2015-07-10 19:18:39 +0300 |
|---|---|---|
| committer | Francisco Jerez <[email protected]> | 2015-07-16 18:29:32 +0300 |
| commit | 3ee2daf23dc91b8dfc017b5c89c10ab1376ba4df (patch) | |
| tree | 543f89614463538b7e3f5348d8b00a887332ef67 /src | |
| parent | 8fba933ca2dd3c3487281135a9063b6ca9bed359 (diff) | |
i965: Implement b2f and b2i using negation.
Booleans are represented as 0/-1 on modern hardware which means we can
just negate them to convert them into a numeric type. Negation has
the benefit that it can be implemented using a source modifier which
can easily be propagated into some other instruction. shader-db
results on HSW:
total instructions in shared programs: 6349082 -> 6346693 (-0.04%)
instructions in affected programs: 40948 -> 38559 (-5.83%)
helped: 123
HURT: 1
GAINED: 1
LOST: 0
Reviewed-by: Matt Turner <[email protected]>
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_nir.cpp | 4 | ||||
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp | 7 |
2 files changed, 2 insertions, 9 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp index 10903a11c31..198703281e6 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp @@ -968,10 +968,8 @@ fs_visitor::nir_emit_alu(const fs_builder &bld, nir_alu_instr *instr) break; case nir_op_b2i: - bld.AND(result, op[0], fs_reg(1)); - break; case nir_op_b2f: - bld.AND(retype(result, BRW_REGISTER_TYPE_UD), op[0], fs_reg(0x3f800000u)); + bld.MOV(result, negate(op[0])); break; case nir_op_f2b: diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp index 67f2b5c29ff..8a352d33e2f 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp @@ -1733,16 +1733,11 @@ vec4_visitor::visit(ir_expression *ir) emit(MOV(result_dst, op[0])); break; case ir_unop_b2i: - emit(AND(result_dst, op[0], src_reg(1))); - break; case ir_unop_b2f: if (devinfo->gen <= 5) { resolve_bool_comparison(ir->operands[0], &op[0]); } - op[0].type = BRW_REGISTER_TYPE_D; - result_dst.type = BRW_REGISTER_TYPE_D; - emit(AND(result_dst, op[0], src_reg(0x3f800000u))); - result_dst.type = BRW_REGISTER_TYPE_F; + emit(MOV(result_dst, negate(op[0]))); break; case ir_unop_f2b: emit(CMP(result_dst, op[0], src_reg(0.0f), BRW_CONDITIONAL_NZ)); |