nir: Remove the ffma peephole

This is no longer needed because it's now part of the algebraic
optimization pass

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>

2 files changed, 0 insertions, 190 deletions

diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources
index 604d9ed..a61f234 100644
--- a/src/glsl/Makefile.sources
+++ b/src/glsl/Makefile.sources
@@ -41,7 +41,6 @@ NIR_FILES = \
 	$(GLSL_SRCDIR)/nir/nir_opt_cse.c \
 	$(GLSL_SRCDIR)/nir/nir_opt_dce.c \
 	$(GLSL_SRCDIR)/nir/nir_opt_global_to_local.c \
-	$(GLSL_SRCDIR)/nir/nir_opt_peephole_ffma.c \
 	$(GLSL_SRCDIR)/nir/nir_opt_peephole_select.c \
 	$(GLSL_SRCDIR)/nir/nir_print.c \
 	$(GLSL_SRCDIR)/nir/nir_remove_dead_variables.c \
diff --git a/src/glsl/nir/nir_opt_peephole_ffma.c b/src/glsl/nir/nir_opt_peephole_ffma.c
deleted file mode 100644
index 1165d7a..0000000
--- a/src/glsl/nir/nir_opt_peephole_ffma.c
+++ /dev/null
@@ -1,189 +0,0 @@
-/*
- * Copyright © 2014 Intel Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- *
- * Authors:
- *    Jason Ekstrand (jason@jlekstrand.net)
- *
- */
-
-#include "nir.h"
-
-/*
- * Implements a small peephole optimization that looks for a multiply that
- * is only ever used in an add and replaces both with an fma.
- */
-
-struct peephole_ffma_state {
-   void *mem_ctx;
-   bool progress;
-};
-
-static inline nir_alu_instr *
-get_mul_for_src(nir_alu_instr *add, unsigned idx)
-{
-   if (!add->src[idx].src.is_ssa)
-      return NULL;
-
-   /* We can't handle these in between the operations */
-   if (add->src[idx].negate || add->src[idx].abs)
-      return NULL;
-
-   nir_instr *instr = add->src[idx].src.ssa->parent_instr;
-   if (instr->type != nir_instr_type_alu)
-      return NULL;
-
-   nir_alu_instr *mul = nir_instr_as_alu(instr);
-   if (mul->op != nir_op_fmul)
-      return NULL;
-
-   /* Can't handle a saturate in between */
-   if (mul->dest.saturate)
-      return NULL;
-
-   /* We already know that the same source is not used twice in the add and
-    * we will assume valid use-def information, so this check is sufficient
-    */
-   if (mul->dest.dest.ssa.uses->entries > 1)
-      return NULL; /* Not the only use */
-
-   return mul;
-}
-
-/* Copies (and maybe swizzles) the given ALU source */
-static inline void
-copy_alu_src(void *mem_ctx, nir_alu_src *new_src, nir_alu_src old_src,
-             uint8_t *swizzle)
-{
-   new_src->src = nir_src_copy(old_src.src, mem_ctx);
-   new_src->abs = old_src.abs;
-   new_src->negate = old_src.negate;
-
-   if (swizzle == NULL) {
-      memcpy(new_src->swizzle, old_src.swizzle, sizeof old_src.swizzle);
-   } else {
-      for (int i = 0; i < 4; ++i) {
-         if (swizzle[i] < 4)
-            new_src->swizzle[i] = old_src.swizzle[swizzle[i]];
-      }
-   }
-}
-
-static bool
-nir_opt_peephole_ffma_block(nir_block *block, void *void_state)
-{
-   struct peephole_ffma_state *state = void_state;
-
-   nir_foreach_instr_safe(block, instr) {
-      if (instr->type != nir_instr_type_alu)
-         continue;
-
-      nir_alu_instr *add = nir_instr_as_alu(instr);
-      if (add->op != nir_op_fadd)
-         continue;
-
-      /* TODO: Maybe bail if this expression is considered "precise"? */
-
-      /* This, is the case a + a.  We would rather handle this with an
-       * algebraic reduction than fuse it.  Also, we want to only fuse
-       * things where the multiply is used only once and, in this case,
-       * it would be used twice by the same instruction.
-       */
-      if (add->src[0].src.is_ssa && add->src[1].src.is_ssa &&
-          add->src[0].src.ssa == add->src[1].src.ssa)
-         continue;
-
-      nir_alu_instr *mul = get_mul_for_src(add, 0);
-      unsigned mul_src = 0;
-
-      if (mul == NULL) {
-         mul = get_mul_for_src(add, 1);
-         mul_src = 1;
-      }
-
-      if (mul == NULL)
-         continue;
-
-      nir_alu_instr *ffma = nir_alu_instr_create(state->mem_ctx, nir_op_ffma);
-      ffma->dest.saturate = add->dest.saturate;
-      ffma->dest.write_mask = add->dest.write_mask;
-
-      copy_alu_src(state->mem_ctx, &ffma->src[0], mul->src[0],
-                   add->src[mul_src].swizzle);
-      copy_alu_src(state->mem_ctx, &ffma->src[1], mul->src[1],
-                   add->src[mul_src].swizzle);
-      copy_alu_src(state->mem_ctx, &ffma->src[2], add->src[1 - mul_src], NULL);
-
-      if (add->dest.dest.is_ssa) {
-         ffma->dest.dest.is_ssa = true;
-         nir_ssa_def_init(&ffma->instr, &ffma->dest.dest.ssa,
-                          add->dest.dest.ssa.num_components,
-                          add->dest.dest.ssa.name);
-
-         nir_src ffma_dest_src = {
-            .is_ssa = true,
-            .ssa = &ffma->dest.dest.ssa,
-         };
-         nir_ssa_def_rewrite_uses(&add->dest.dest.ssa, ffma_dest_src,
-                                  state->mem_ctx);
-      } else {
-         ffma->dest.dest = nir_dest_copy(add->dest.dest, state->mem_ctx);
-      }
-
-      nir_instr_insert_before(&add->instr, &ffma->instr);
-      nir_instr_remove(&add->instr);
-      nir_instr_remove(&mul->instr);
-
-      state->progress = true;
-   }
-
-   return true;
-}
-
-static bool
-nir_opt_peephole_ffma_impl(nir_function_impl *impl)
-{
-   struct peephole_ffma_state state;
-
-   state.mem_ctx = ralloc_parent(impl);
-   state.progress = false;
-
-   nir_foreach_block(impl, nir_opt_peephole_ffma_block, &state);
-
-   if (state.progress)
-      nir_metadata_dirty(impl, nir_metadata_block_index |
-                               nir_metadata_dominance);
-
-   return state.progress;
-}
-
-bool
-nir_opt_peephole_ffma(nir_shader *shader)
-{
-   bool progress = false;
-
-   nir_foreach_overload(shader, overload) {
-      if (overload->impl)
-         progress |= nir_opt_peephole_ffma_impl(overload->impl);
-   }
-
-   return progress;
-}