nir: add lower_ldexp to nir compiler options

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/broadcom/compiler/nir_to_vir.c

@@ -1893,6 +1893,7 @@ const nir_shader_compiler_options v3d_nir_options = {
         .lower_fpow = true,
         .lower_fsat = true,
         .lower_fsqrt = true,
+        .lower_ldexp = true,
         .native_integers = true,
 };
 

src/compiler/nir/nir.h

@@ -1859,6 +1859,8 @@ typedef struct nir_shader_compiler_options {
    /** lowers ffract to fsub+ffloor: */
    bool lower_ffract;
 
+   bool lower_ldexp;
+
    bool lower_pack_half_2x16;
    bool lower_pack_unorm_2x16;
    bool lower_pack_snorm_2x16;

src/compiler/nir/nir_opt_algebraic.py

@@ -560,8 +560,8 @@ def ldexp(f, exp, bits):
    return ('fmul', ('fmul', f, pow2_1), pow2_2)
 
 optimizations += [
-   (('ldexp@32', 'x', 'exp'), ldexp('x', 'exp', 32)),
-   (('ldexp@64', 'x', 'exp'), ldexp('x', 'exp', 64)),
+   (('ldexp@32', 'x', 'exp'), ldexp('x', 'exp', 32), 'options->lower_ldexp'),
+   (('ldexp@64', 'x', 'exp'), ldexp('x', 'exp', 64), 'options->lower_ldexp'),
 ]
 
 # Unreal Engine 4 demo applications open-codes bitfieldReverse()

src/gallium/drivers/freedreno/ir3/ir3_nir.c

@@ -44,6 +44,7 @@ static const nir_shader_compiler_options options = {
 		.lower_fmod32 = true,
 		.lower_fmod64 = true,
 		.lower_fdiv = true,
+		.lower_ldexp = true,
 		.fuse_ffma = true,
 		.native_integers = true,
 		.vertex_id_zero_based = true,

src/gallium/drivers/vc4/vc4_program.c

@@ -2188,6 +2188,7 @@ static const nir_shader_compiler_options nir_options = {
         .lower_fpow = true,
         .lower_fsat = true,
         .lower_fsqrt = true,
+        .lower_ldexp = true,
         .lower_negate = true,
         .native_integers = true,
         .max_unroll_iterations = 32,

src/intel/compiler/brw_compiler.c

@@ -41,6 +41,7 @@
    .lower_usub_borrow = true,                                                 \
    .lower_fdiv = true,                                                        \
    .lower_flrp64 = true,                                                      \
+   .lower_ldexp = true,                                                       \
    .native_integers = true,                                                   \
    .use_interpolated_input_intrinsics = true,                                 \
    .vertex_id_zero_based = true