[Mesa-dev] [PATCH 2/3] i965/vec4: Fix exec size for MOVs SET_{HIGH, LOW}_32BIT.

[Matt Turner]

Otherwise for a pack_double_2x32_split opcode, we emit:

   vec1 64 ssa_135 = pack_double_2x32_split ssa_133, ssa_134
mov(8)          g5<1>UD         g5<4>.xUD                       { align16 1Q compacted };
mov(8)          g7<2>UD         g5<4,4,1>UD                     { align1 1Q };
        ERROR: When the destination spans two registers, the source must span two registers
               (exceptions for scalar source and packed-word to packed-dword expansion)
mov(8)          g8<2>UD         g5.4<4,4,1>UD                   { align1 2N };
        ERROR: The offset from the two source registers must be the same
mov(8)          g5<1>UD         g6<4>.xUD                       { align16 1Q compacted };
mov(8)          g7.1<2>UD       g5<4,4,1>UD                     { align1 1Q };
        ERROR: When the destination spans two registers, the source must span two registers
               (exceptions for scalar source and packed-word to packed-dword expansion)
mov(8)          g8.1<2>UD       g5.4<4,4,1>UD                   { align1 2N };
        ERROR: The offset from the two source registers must be the same

The intention was to emit mov(4)s for the instructions that have ERROR
annotations.

See tests/spec/arb_gpu_shader_fp64/execution/vs-isinf-dvec.shader_test
for example.
---
 src/mesa/drivers/dri/i965/brw_vec4_generator.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp b/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
index b570792..f6034bc 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
@@ -2025,6 +2025,7 @@ generate_code(struct brw_codegen *p,
          assert(type_sz(dst.type) == 8);
 
          brw_set_default_access_mode(p, BRW_ALIGN_1);
+         brw_set_default_exec_size(p, BRW_EXECUTE_4);
 
          dst = retype(dst, BRW_REGISTER_TYPE_UD);
          if (inst->opcode == VEC4_OPCODE_SET_HIGH_32BIT)
@@ -2037,6 +2038,7 @@ generate_code(struct brw_codegen *p,
          src[0].hstride = BRW_HORIZONTAL_STRIDE_1;
          brw_MOV(p, dst, src[0]);
 
+         brw_set_default_exec_size(p, BRW_EXECUTE_8);
          brw_set_default_access_mode(p, BRW_ALIGN_16);
          break;
       }
-- 
2.7.3