[Mesa-dev] [PATCH v2 42/53] intel/compiler: implement isign for int8

[Iago Toral Quiroga]

Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
---
 src/intel/compiler/brw_fs_nir.cpp | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/src/intel/compiler/brw_fs_nir.cpp b/src/intel/compiler/brw_fs_nir.cpp
index 57bc8a01a91..2f3ad554147 100644
--- a/src/intel/compiler/brw_fs_nir.cpp
+++ b/src/intel/compiler/brw_fs_nir.cpp
@@ -982,11 +982,28 @@ fs_visitor::nir_emit_alu(const fs_builder &bld, nir_alu_instr *instr)
        *  Predicated OR sets 1 if val is positive.
        */
       uint32_t bit_size = nir_dest_bit_size(instr->dest.dest);
-      assert(bit_size == 32 || bit_size == 16);
 
-      fs_reg zero = bit_size == 32 ? brw_imm_d(0) : brw_imm_w(0);
-      fs_reg one = bit_size == 32 ? brw_imm_d(1) : brw_imm_w(1);
-      fs_reg shift = bit_size == 32 ? brw_imm_d(31) : brw_imm_w(15);
+      fs_reg zero, one, shift;
+      switch (bit_size) {
+      case 32:
+         zero = brw_imm_d(0);
+         one = brw_imm_d(1);
+         shift = brw_imm_d(31);
+         break;
+      case 16:
+         zero = brw_imm_w(0);
+         one = brw_imm_w(1);
+         shift = brw_imm_w(15);
+         break;
+      case 8: {
+         zero = setup_imm_b(bld, 0);
+         one = setup_imm_b(bld, 1);
+         shift = setup_imm_b(bld, 7);
+         break;
+      }
+      default:
+         unreachable("unsupported bit-size");
+      };
 
       bld.CMP(bld.null_reg_d(), op[0], zero, BRW_CONDITIONAL_G);
       bld.ASR(result, op[0], shift);
-- 
2.17.1