nir/dead_cf: delete code that's unreachable due to jumps

[mesa.git] / src / glsl / nir / nir_builder.h

diff --git a/src/glsl/nir/nir_builder.h b/src/glsl/nir/nir_builder.h
index 6459e9a7e296248128a4b009bd22272839553472..ba988d71dde406cff6e0284ec6befac0233101b1 100644 (file)
--- a/src/glsl/nir/nir_builder.h
+++ b/src/glsl/nir/nir_builder.h
@@ -24,10 +24,13 @@
 #ifndef NIR_BUILDER_H
 #define NIR_BUILDER_H
 
+#include "nir_control_flow.h"
+
 struct exec_list;
 
 typedef struct nir_builder {
-   struct exec_list *cf_node_list;
+   nir_cursor cursor;
+
    nir_shader *shader;
    nir_function_impl *impl;
 } nir_builder;
@@ -41,10 +44,18 @@ nir_builder_init(nir_builder *build, nir_function_impl *impl)
 }
 
 static inline void
-nir_builder_insert_after_cf_list(nir_builder *build,
-                                 struct exec_list *cf_node_list)
+nir_builder_instr_insert(nir_builder *build, nir_instr *instr)
+{
+   nir_instr_insert(build->cursor, instr);
+
+   /* Move the cursor forward. */
+   build->cursor = nir_after_instr(instr);
+}
+
+static inline void
+nir_builder_cf_insert(nir_builder *build, nir_cf_node *cf)
 {
-   build->cf_node_list = cf_node_list;
+   nir_cf_node_insert(build->cursor, cf);
 }
 
 static inline nir_ssa_def *
@@ -57,7 +68,7 @@ nir_build_imm(nir_builder *build, unsigned num_components, nir_const_value value
 
    load_const->value = value;
 
-   nir_instr_insert_after_cf_list(build->cf_node_list, &load_const->instr);
+   nir_builder_instr_insert(build, &load_const->instr);
 
    return &load_const->def;
 }
@@ -125,7 +136,7 @@ nir_build_alu(nir_builder *build, nir_op op, nir_ssa_def *src0,
    nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components, NULL);
    instr->dest.write_mask = (1 << num_components) - 1;
 
-   nir_instr_insert_after_cf_list(build->cf_node_list, &instr->instr);
+   nir_builder_instr_insert(build, &instr->instr);
 
    return &instr->dest.dest.ssa;
 }
@@ -172,7 +183,7 @@ nir_fmov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
    nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
    mov->dest.write_mask = (1 << num_components) - 1;
    mov->src[0] = src;
-   nir_instr_insert_after_cf_list(build->cf_node_list, &mov->instr);
+   nir_builder_instr_insert(build, &mov->instr);
 
    return &mov->dest.dest.ssa;
 }
@@ -184,7 +195,7 @@ nir_imov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
    nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components, NULL);
    mov->dest.write_mask = (1 << num_components) - 1;
    mov->src[0] = src;
-   nir_instr_insert_after_cf_list(build->cf_node_list, &mov->instr);
+   nir_builder_instr_insert(build, &mov->instr);
 
    return &mov->dest.dest.ssa;
 }
@@ -196,8 +207,7 @@ static inline nir_ssa_def *
 nir_swizzle(nir_builder *build, nir_ssa_def *src, unsigned swiz[4],
             unsigned num_components, bool use_fmov)
 {
-   nir_alu_src alu_src;
-   memset(&alu_src, 0, sizeof(alu_src));
+   nir_alu_src alu_src = { NIR_SRC_INIT };
    alu_src.src = nir_src_for_ssa(src);
    for (int i = 0; i < 4; i++)
       alu_src.swizzle[i] = swiz[i];
@@ -206,4 +216,22 @@ nir_swizzle(nir_builder *build, nir_ssa_def *src, unsigned swiz[4],
                      nir_imov_alu(build, alu_src, num_components);
 }
 
+/**
+ * Turns a nir_src into a nir_ssa_def * so it can be passed to
+ * nir_build_alu()-based builder calls.
+ */
+static inline nir_ssa_def *
+nir_ssa_for_src(nir_builder *build, nir_src src, int num_components)
+{
+   if (src.is_ssa && src.ssa->num_components == num_components)
+      return src.ssa;
+
+   nir_alu_src alu = { NIR_SRC_INIT };
+   alu.src = src;
+   for (int j = 0; j < 4; j++)
+      alu.swizzle[j] = j;
+
+   return nir_imov_alu(build, alu, num_components);
+}
+
 #endif /* NIR_BUILDER_H */