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i965/fs: Drop offset_reg temporary in ssbo load 

Now that we don't read each component one-by-one, we don't need the
temoprary vgrf for the offset. More importantly, this register was type
UD while the nir source was type D. This broke copy propagation and left
a redundant MOV in the generated code.

Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Kristian Høgsberg Kristensen <krh@bitplanet.net>
This commit is contained in:
Kristian Høgsberg Kristensen 2015-10-21 22:49:14 -07:00
parent 0a5a738252
commit feff21d1a6
1 changed files with 3 additions and 5 deletions
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8
src/mesa/drivers/dri/i965/brw_fs_nir.cpp
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@ -1521,13 +1521,11 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
}
/* Get the offset to read from */
fs_reg offset_reg = vgrf(glsl_type::uint_type);
unsigned const_offset_bytes = 0;
fs_reg offset_reg;
if (has_indirect) {
bld.MOV(offset_reg, get_nir_src(instr->src[1]));
offset_reg = get_nir_src(instr->src[1]);
} else {
const_offset_bytes = instr->const_index[0];
bld.MOV(offset_reg, fs_reg(const_offset_bytes));
offset_reg = fs_reg(instr->const_index[0]);
}
/* Read the vector */