Mesa (master): intel/compiler: handle 16-bit to 64-bit conversions in BSW platforms

[Iago Toral Quiroga]

Module: Mesa
Branch: master
Commit: a75f967388b3224fb4da02f5bd01916018b639d4
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a75f967388b3224fb4da02f5bd01916018b639d4

Author: Iago Toral Quiroga <itoral at igalia.com>
Date:   Fri May  4 09:55:55 2018 +0200

intel/compiler: handle 16-bit to 64-bit conversions in BSW platforms

These are subject to the general restriction that anything that is converted
to 64-bit needs to be aligned to 64-bit.  We had this already in place for
32-bit to 64-bit conversions, so this patch generalizes the implementation
to take effect on any conversion to 64-bit from a source smaller than
64-bit.

Fixes assembly validation errors in the following CTS tests in BSW:
dEQP-VK.spirv_assembly.instruction.compute.sconvert.int16_to_int64
dEQP-VK.spirv_assembly.instruction.compute.uconvert.uint16_to_uint64
dEQP-VK.spirv_assembly.instruction.compute.sconvert.int16_to_uint64

Tested-by: Mark Janes <mark.a.janes at intel.com>
Reviewed-by: Matt Turner <mattst88 at gmail.com>
Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>

---

 src/intel/compiler/brw_fs_nir.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/intel/compiler/brw_fs_nir.cpp b/src/intel/compiler/brw_fs_nir.cpp
index f9fde145a1..c7f7bc21b8 100644
--- a/src/intel/compiler/brw_fs_nir.cpp
+++ b/src/intel/compiler/brw_fs_nir.cpp
@@ -785,12 +785,12 @@ fs_visitor::nir_emit_alu(const fs_builder &bld, nir_alu_instr *instr)
        *        the same qword.
        *     (...)"
        *
-       * This means that 32-bit to 64-bit conversions need to have the 32-bit
-       * data elements aligned to 64-bit. This restriction does not apply to
-       * BDW and later.
+       * This means that conversions from bit-sizes smaller than 64-bit to
+       * 64-bit need to have the source data elements aligned to 64-bit.
+       * This restriction does not apply to BDW and later.
        */
       if (nir_dest_bit_size(instr->dest.dest) == 64 &&
-          nir_src_bit_size(instr->src[0].src) == 32 &&
+          nir_src_bit_size(instr->src[0].src) < 64 &&
           (devinfo->is_cherryview || gen_device_info_is_9lp(devinfo))) {
          fs_reg tmp = bld.vgrf(result.type, 1);
          tmp = subscript(tmp, op[0].type, 0);