i965/fs: Don't rely on the default builder to create a null register in emit_spill.

It's not guaranteed to have the same width as the instruction
generating the spilled variable.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

diff --git a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
index f25f2ec..6a7ed64 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
@@ -738,7 +738,7 @@ fs_visitor::emit_spill(bblock_t *block, fs_inst *inst, fs_reg src,
 
    for (int i = 0; i < count / reg_size; i++) {
       fs_inst *spill_inst =
-         ibld.emit(SHADER_OPCODE_GEN4_SCRATCH_WRITE, bld.null_reg_f(), src);
+         ibld.emit(SHADER_OPCODE_GEN4_SCRATCH_WRITE, ibld.null_reg_f(), src);
       src.reg_offset += reg_size;
       spill_inst->offset = spill_offset + i * reg_size * REG_SIZE;
       spill_inst->mlen = 1 + reg_size; /* header, value */