The analysis code was already there and running, we just weren't doing anything with the result of it yet. --- src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp index b13465b..27f23d0 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp @@ -1292,6 +1292,19 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr) default: unreachable("Unimplemented ALU operation"); } + + /* If we need to do a boolean resolve, replace the result with -(x & 1) + * to sign extend the low bit to 0/~0 + */ + if (devinfo->gen <= 5 && + (instr->instr.pass_flags & BRW_NIR_BOOLEAN_MASK) == BRW_NIR_BOOLEAN_NEEDS_RESOLVE) { + dst_reg masked = dst_reg(this, glsl_type::int_type); + masked.writemask = dst.writemask; + emit(AND(masked, src_reg(dst), src_reg(1))); + src_reg masked_neg = src_reg(masked); + masked_neg.negate = true; + emit(MOV(retype(dst, BRW_REGISTER_TYPE_D), masked_neg)); + } } void -- 2.4.3 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev