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i965/fs: Mark UBO uniform pull constant loads as force_writemask_all.

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This lets the rest of the backend know that the uniform pull constant
load opcodes don't respect channel enables -- Without this the
register allocator has no way to know that the return payload of a
pull constant load is not per-channel and spills of the destination
will be broken under non-uniform control flow.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Francisco Jerez 2016-05-23 14:07:23 -07:00
parent 7eb4966887
commit 015035027b
2 changed files with 4 additions and 1 deletions
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2
src/mesa/drivers/dri/i965/brw_fs_generator.cpp
View file

@ -2176,10 +2176,12 @@ fs_generator::generate_code(const cfg_t *cfg, int dispatch_width)
break;
case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD:
assert(inst->force_writemask_all);
generate_uniform_pull_constant_load(inst, dst, src[0], src[1]);
break;
case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7:
assert(inst->force_writemask_all);
generate_uniform_pull_constant_load_gen7(inst, dst, src[0], src[1]);
break;

3
src/mesa/drivers/dri/i965/brw_fs_nir.cpp
View file

@ -3611,7 +3611,8 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
const unsigned count = MIN2(instr->num_components - c,
(16 - base % 16) / type_size);
bld.emit(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD,
bld.exec_all()
.emit(FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD,
packed_consts, surf_index, brw_imm_ud(base & ~15));
const fs_reg consts =