nir: Add an ALU lowering pass for mul_high.

This is based on the glsl/lower_instructions.cpp implementation, but
should be much more readable.

Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index b9426f8eb4e..7d01eb23bc4 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -1919,6 +1919,8 @@ typedef struct nir_shader_compiler_options {
    bool lower_find_lsb;
    bool lower_uadd_carry;
    bool lower_usub_borrow;
+   /** Lowers imul_high/umul_high to 16-bit multiplies and carry operations. */
+   bool lower_mul_high;
    /** lowers fneg and ineg to fsub and isub. */
    bool lower_negate;
    /** lowers fsub and isub to fadd+fneg and iadd+ineg. */
@@ -2628,6 +2630,7 @@ bool nir_move_vec_src_uses_to_dest(nir_shader *shader);
 bool nir_lower_vec_to_movs(nir_shader *shader);
 void nir_lower_alpha_test(nir_shader *shader, enum compare_func func,
                           bool alpha_to_one);
+bool nir_lower_alu(nir_shader *shader);
 bool nir_lower_alu_to_scalar(nir_shader *shader);
 bool nir_lower_load_const_to_scalar(nir_shader *shader);
 bool nir_lower_read_invocation_to_scalar(nir_shader *shader);