i965/fs: implement d2b

v2: Use subscript() instead of stride() (Curro)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index f4f4359..c456339 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -1107,6 +1107,19 @@ fs_visitor::nir_emit_alu(const fs_builder &bld, nir_alu_instr *instr)
    case nir_op_f2b:
       bld.CMP(result, op[0], brw_imm_f(0.0f), BRW_CONDITIONAL_NZ);
       break;
+   case nir_op_d2b: {
+      /* two-argument instructions can't take 64-bit immediates */
+      fs_reg zero = vgrf(glsl_type::double_type);
+      bld.MOV(zero, brw_imm_df(0.0));
+      /* A SIMD16 execution needs to be split in two instructions, so use
+       * a vgrf instead of the flag register as dst so instruction splitting
+       * works
+       */
+      fs_reg tmp = vgrf(glsl_type::double_type);
+      bld.CMP(tmp, op[0], zero, BRW_CONDITIONAL_NZ);
+      bld.MOV(result, subscript(tmp, BRW_REGISTER_TYPE_UD, 0));
+      break;
+   }
    case nir_op_i2b:
       bld.CMP(result, op[0], brw_imm_d(0), BRW_CONDITIONAL_NZ);
       break;