r300: Request that nir-to-tgsi avoid generating TGSI_OPCODE_CMP.
Given that our fcsels are on float-bools, we can emit the LRP directly and save the backend having to emit a SLT to turn the CMP src[0] into a bool. This required passing a codegen flags struct for nir-to-tgsi. I think this is a good way forward for it, as the alternative I think has mostly been adding flags to nir_shader_compiler_options (since adding PIPE_SHADER_CAPs is an unreasonable amount of pain). r300 shader-db: total instructions in shared programs: 1484320 -> 1472463 (-0.80%) instructions in affected programs: 243588 -> 231731 (-4.87%) total temps in shared programs: 212485 -> 212143 (-0.16%) temps in affected programs: 3845 -> 3503 (-8.89%) Acked-by: Pavel Ondračka <pavel.ondracka@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14886>
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@ -37,6 +37,7 @@
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struct ntt_compile {
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nir_shader *s;
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nir_function_impl *impl;
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const struct nir_to_tgsi_options *options;
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struct pipe_screen *screen;
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struct ureg_program *ureg;
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@ -1156,15 +1157,26 @@ ntt_emit_alu(struct ntt_compile *c, nir_alu_instr *instr)
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break;
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case nir_op_fcsel:
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/* NIR is src0 != 0 ? src1 : src2.
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* TGSI is src0 < 0 ? src1 : src2.
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/* NIR fcsel is src0 != 0 ? src1 : src2.
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* TGSI CMP is src0 < 0 ? src1 : src2.
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*
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* However, fcsel so far as I can find only appears on bools-as-floats
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* (1.0 or 0.0), so we can just negate it for the TGSI op. It's
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* important to not have an abs here, as i915g has to make extra
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* instructions to do the abs.
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*/
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ureg_CMP(c->ureg, dst, ureg_negate(src[0]), src[1], src[2]);
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if (c->options->lower_cmp) {
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/* If the HW doesn't support TGSI CMP (r300 VS), then lower it to a
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* LRP on the boolean 1.0/0.0 value, instead of requiring the
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* backend to turn the src0 into 1.0/0.0 first.
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*
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* We don't use this in general because some hardware (i915 FS) the
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* LRP gets expanded to MUL/MAD.
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*/
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ureg_LRP(c->ureg, dst, src[0], src[1], src[2]);
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} else {
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ureg_CMP(c->ureg, dst, ureg_negate(src[0]), src[1], src[2]);
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}
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break;
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/* It would be nice if we could get this left as scalar in NIR, since
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@ -2906,7 +2918,8 @@ nir_to_tgsi_lower_tex(nir_shader *s)
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}
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static void
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ntt_fix_nir_options(struct pipe_screen *screen, struct nir_shader *s)
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ntt_fix_nir_options(struct pipe_screen *screen, struct nir_shader *s,
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const struct nir_to_tgsi_options *ntt_options)
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{
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const struct nir_shader_compiler_options *options = s->options;
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bool lower_fsqrt =
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@ -3051,6 +3064,14 @@ nir_lower_primid_sysval_to_input(nir_shader *s)
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nir_lower_primid_sysval_to_input_lower, &input);
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}
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const void *
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nir_to_tgsi(struct nir_shader *s,
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struct pipe_screen *screen)
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{
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static const struct nir_to_tgsi_options default_ntt_options = {0};
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return nir_to_tgsi_options(s, screen, &default_ntt_options);
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}
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/**
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* Translates the NIR shader to TGSI.
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*
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@ -3058,9 +3079,9 @@ nir_lower_primid_sysval_to_input(nir_shader *s)
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* We take ownership of the NIR shader passed, returning a reference to the new
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* TGSI tokens instead. If you need to keep the NIR, then pass us a clone.
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*/
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const void *
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nir_to_tgsi(struct nir_shader *s,
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struct pipe_screen *screen)
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const void *nir_to_tgsi_options(struct nir_shader *s,
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struct pipe_screen *screen,
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const struct nir_to_tgsi_options *options)
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{
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struct ntt_compile *c;
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const void *tgsi_tokens;
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@ -3070,7 +3091,7 @@ nir_to_tgsi(struct nir_shader *s,
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PIPE_SHADER_CAP_INTEGERS);
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const struct nir_shader_compiler_options *original_options = s->options;
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ntt_fix_nir_options(screen, s);
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ntt_fix_nir_options(screen, s, options);
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NIR_PASS_V(s, nir_lower_io, nir_var_shader_in | nir_var_shader_out,
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type_size, (nir_lower_io_options)0);
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@ -3157,6 +3178,7 @@ nir_to_tgsi(struct nir_shader *s,
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c = rzalloc(NULL, struct ntt_compile);
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c->screen = screen;
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c->options = options;
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c->needs_texcoord_semantic =
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screen->get_param(screen, PIPE_CAP_TGSI_TEXCOORD);
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@ -24,12 +24,22 @@
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#ifndef NIR_TO_TGSI_H
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#define NIR_TO_TGSI_H
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#include <stdbool.h>
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struct nir_shader;
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struct pipe_screen;
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struct nir_to_tgsi_options {
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bool lower_cmp;
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};
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const void *nir_to_tgsi(struct nir_shader *s,
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struct pipe_screen *screen);
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const void *nir_to_tgsi_options(struct nir_shader *s,
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struct pipe_screen *screen,
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const struct nir_to_tgsi_options *ntt_options);
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const void *
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nir_to_tgsi_get_compiler_options(struct pipe_screen *pscreen,
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enum pipe_shader_ir ir,
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@ -48,12 +48,6 @@ dEQP-GLES2.functional.rasterization.primitives.line_loop_wide,Fail
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dEQP-GLES2.functional.shaders.functions.control_flow.mixed_return_break_continue_vertex,Fail
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dEQP-GLES2.functional.shaders.functions.control_flow.mixed_return_break_continue_fragment,Fail
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# "No free temporary to use for predicate stack counter."
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dEQP-GLES2.functional.shaders.indexing.tmp_array.float_const_write_dynamic_loop_read_vertex,Fail
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dEQP-GLES2.functional.shaders.indexing.tmp_array.vec2_const_write_dynamic_loop_read_vertex,Fail
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dEQP-GLES2.functional.shaders.indexing.tmp_array.vec3_const_write_dynamic_loop_read_vertex,Fail
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dEQP-GLES2.functional.shaders.indexing.tmp_array.vec4_const_write_dynamic_loop_read_vertex,Fail
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# "Rewrite of inst 0 failed Can't allocate source for Inst 4 src_type=1 new_index=1 new_mask=1"
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dEQP-GLES2.functional.shaders.indexing.vector_subscript.vec2_dynamic_subscript_write_component_read_fragment,Fail
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dEQP-GLES2.functional.shaders.indexing.vector_subscript.vec2_dynamic_subscript_write_direct_read_fragment,Fail
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@ -1943,7 +1943,13 @@ static void* r300_create_vs_state(struct pipe_context* pipe,
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vs->state = *shader;
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if (vs->state.type == PIPE_SHADER_IR_NIR) {
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vs->state.tokens = nir_to_tgsi(shader->ir.nir, pipe->screen);
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static const struct nir_to_tgsi_options swtcl_options = {0};
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static const struct nir_to_tgsi_options hwtcl_options = {
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.lower_cmp = true,
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};
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vs->state.tokens = nir_to_tgsi_options(shader->ir.nir, pipe->screen,
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r300->screen->caps.has_tcl ?
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&hwtcl_options : &swtcl_options);
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} else {
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assert(vs->state.type == PIPE_SHADER_IR_TGSI);
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/* we need to keep a local copy of the tokens */
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