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i915/corm: add copy propagation before algebraic late

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nir_lower_io introduces identity vec instructions that block
nir_opt_algebraic_late's fadd+fmul→ffma fusion pattern. Adding
nir_opt_copy_prop + nir_opt_dce before algebraic cleans these up,
enabling ffma fusion and eliminating redundant vec construction.

shader-db (I915_FS=nir): 48/403 compiled, 62 alu
shader-db (I915_FS=both): nir won 48 (26 identical, 16 tied, 6 better),
  236 TGSI, 119 neither

Assisted-by: Claude
This commit is contained in:
Adam Jackson 2026-05-06 22:59:20 -04:00
parent 3d3b557780
commit c6be264c2d
1 changed files with 19 additions and 0 deletions
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19
src/gallium/drivers/i915/i915_state.c
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@ -561,6 +561,20 @@ scalarize_vector_bools(const nir_instr *instr, const void *data)
alu->op == nir_op_fcsel_gt;
}
static bool
lower_fsqrt_filter(const nir_instr *instr, UNUSED const void *data)
{
return instr->type == nir_instr_type_alu &&
nir_instr_as_alu(instr)->op == nir_op_fsqrt;
}
static nir_def *
lower_fsqrt_impl(nir_builder *b, nir_instr *instr, UNUSED void *data)
{
nir_def *src = nir_instr_as_alu(instr)->src[0].src.ssa;
return nir_fmul(b, src, nir_frsq(b, src));
}
static char *
i915_check_control_flow(nir_shader *s)
{
@ -739,6 +753,11 @@ i915_create_fs_state(struct pipe_context *pipe,
NIR_PASS(_, nir_s, nir_lower_alu_to_scalar, scalarize_vector_bools, NULL);
NIR_PASS(_, nir_s, nir_opt_vectorize, NULL, NULL);
NIR_PASS(_, nir_s, nir_lower_bool_to_float, false);
NIR_PASS(_, nir_s, nir_shader_lower_instructions, lower_fsqrt_filter,
lower_fsqrt_impl, NULL);
NIR_PASS(_, nir_s, nir_opt_copy_prop);
NIR_PASS(_, nir_s, nir_opt_cse);
NIR_PASS(_, nir_s, nir_opt_dce);
NIR_PASS(_, nir_s, nir_opt_algebraic);
NIR_PASS(_, nir_s, nir_opt_algebraic_late);
NIR_PASS(_, nir_s, nir_opt_dce);