i965: Move IR object definitions to separate header files.

One should be able to manipulate i965 IR without pulling the whole
FS/VEC4 visitor classes -- Optimization passes and other
transformations would ideally be visitor-agnostic.  Among other issues
this avoids a circular dependency between the header file where such
visitor-agnostic code will be defined and the main FS/VEC4 header
where both IR (layer below) and visitor (layer above) happen to be
defined.

Reviewed-by: Matt Turner <mattst88@gmail.com>

1 files changed, 255 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_ir_fs.h b/src/mesa/drivers/dri/i965/brw_ir_fs.h
new file mode 100644
index 0000000..2369834
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/brw_ir_fs.h
@@ -0,0 +1,255 @@
+/* -*- c++ -*- */
+/*
+ * Copyright © 2010-2015 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.
+ */
+
+#ifndef BRW_IR_FS_H
+#define BRW_IR_FS_H
+
+#include "brw_shader.h"
+
+class fs_inst;
+class fs_visitor;
+
+class fs_reg : public backend_reg {
+public:
+   DECLARE_RALLOC_CXX_OPERATORS(fs_reg)
+
+   void init();
+
+   fs_reg();
+   explicit fs_reg(float f);
+   explicit fs_reg(int32_t i);
+   explicit fs_reg(uint32_t u);
+   explicit fs_reg(uint8_t vf[4]);
+   explicit fs_reg(uint8_t vf0, uint8_t vf1, uint8_t vf2, uint8_t vf3);
+   fs_reg(struct brw_reg fixed_hw_reg);
+   fs_reg(enum register_file file, int reg);
+   fs_reg(enum register_file file, int reg, enum brw_reg_type type);
+   fs_reg(enum register_file file, int reg, enum brw_reg_type type, uint8_t width);
+
+   bool equals(const fs_reg &r) const;
+   bool is_contiguous() const;
+
+   /** Smear a channel of the reg to all channels. */
+   fs_reg &set_smear(unsigned subreg);
+
+   /**
+    * Offset in bytes from the start of the register.  Values up to a
+    * backend_reg::reg_offset unit are valid.
+    */
+   int subreg_offset;
+
+   fs_reg *reladdr;
+
+   /**
+    * The register width.  This indicates how many hardware values are
+    * represented by each virtual value.  Valid values are 1, 8, or 16.
+    * For immediate values, this is 1.  Most of the rest of the time, it
+    * will be equal to the dispatch width.
+    */
+   uint8_t width;
+
+   /**
+    * Returns the effective register width when used as a source in the
+    * given instruction.  Registers such as uniforms and immediates
+    * effectively take on the width of the instruction in which they are
+    * used.
+    */
+   uint8_t effective_width;
+
+   /** Register region horizontal stride */
+   uint8_t stride;
+};
+
+static inline fs_reg
+negate(fs_reg reg)
+{
+   assert(reg.file != HW_REG && reg.file != IMM);
+   reg.negate = !reg.negate;
+   return reg;
+}
+
+static inline fs_reg
+retype(fs_reg reg, enum brw_reg_type type)
+{
+   reg.fixed_hw_reg.type = reg.type = type;
+   return reg;
+}
+
+static inline fs_reg
+byte_offset(fs_reg reg, unsigned delta)
+{
+   switch (reg.file) {
+   case BAD_FILE:
+      break;
+   case GRF:
+   case ATTR:
+      reg.reg_offset += delta / 32;
+      break;
+   case MRF:
+      reg.reg += delta / 32;
+      break;
+   default:
+      assert(delta == 0);
+   }
+   reg.subreg_offset += delta % 32;
+   return reg;
+}
+
+static inline fs_reg
+horiz_offset(fs_reg reg, unsigned delta)
+{
+   switch (reg.file) {
+   case BAD_FILE:
+   case UNIFORM:
+   case IMM:
+      /* These only have a single component that is implicitly splatted.  A
+       * horizontal offset should be a harmless no-op.
+       */
+      break;
+   case GRF:
+   case MRF:
+   case ATTR:
+      return byte_offset(reg, delta * reg.stride * type_sz(reg.type));
+   default:
+      assert(delta == 0);
+   }
+   return reg;
+}
+
+static inline fs_reg
+offset(fs_reg reg, unsigned delta)
+{
+   assert(reg.stride > 0);
+   switch (reg.file) {
+   case BAD_FILE:
+      break;
+   case GRF:
+   case MRF:
+   case ATTR:
+      return byte_offset(reg, delta * reg.width * reg.stride * type_sz(reg.type));
+   case UNIFORM:
+      reg.reg_offset += delta;
+      break;
+   default:
+      assert(delta == 0);
+   }
+   return reg;
+}
+
+static inline fs_reg
+component(fs_reg reg, unsigned idx)
+{
+   assert(reg.subreg_offset == 0);
+   assert(idx < reg.width);
+   reg.subreg_offset = idx * type_sz(reg.type);
+   reg.width = 1;
+   return reg;
+}
+
+/**
+ * Get either of the 8-component halves of a 16-component register.
+ *
+ * Note: this also works if \c reg represents a SIMD16 pair of registers.
+ */
+static inline fs_reg
+half(fs_reg reg, unsigned idx)
+{
+   assert(idx < 2);
+
+   if (reg.file == UNIFORM)
+      return reg;
+
+   assert(idx == 0 || (reg.file != HW_REG && reg.file != IMM));
+   assert(reg.width == 16);
+   reg.width = 8;
+   return horiz_offset(reg, 8 * idx);
+}
+
+static const fs_reg reg_undef;
+
+class fs_inst : public backend_instruction {
+   fs_inst &operator=(const fs_inst &);
+
+   void init(enum opcode opcode, uint8_t exec_width, const fs_reg &dst,
+             fs_reg *src, int sources);
+
+public:
+   DECLARE_RALLOC_CXX_OPERATORS(fs_inst)
+
+   fs_inst();
+   fs_inst(enum opcode opcode, uint8_t exec_size);
+   fs_inst(enum opcode opcode, const fs_reg &dst);
+   fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
+           const fs_reg &src0);
+   fs_inst(enum opcode opcode, const fs_reg &dst, const fs_reg &src0);
+   fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
+           const fs_reg &src0, const fs_reg &src1);
+   fs_inst(enum opcode opcode, const fs_reg &dst, const fs_reg &src0,
+           const fs_reg &src1);
+   fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
+           const fs_reg &src0, const fs_reg &src1, const fs_reg &src2);
+   fs_inst(enum opcode opcode, const fs_reg &dst, const fs_reg &src0,
+           const fs_reg &src1, const fs_reg &src2);
+   fs_inst(enum opcode opcode, const fs_reg &dst, fs_reg src[], int sources);
+   fs_inst(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
+           fs_reg src[], int sources);
+   fs_inst(const fs_inst &that);
+
+   void resize_sources(uint8_t num_sources);
+
+   bool equals(fs_inst *inst) const;
+   bool overwrites_reg(const fs_reg &reg) const;
+   bool is_send_from_grf() const;
+   bool is_partial_write() const;
+   int regs_read(fs_visitor *v, int arg) const;
+   bool can_do_source_mods(struct brw_context *brw);
+
+   bool reads_flag() const;
+   bool writes_flag() const;
+
+   fs_reg dst;
+   fs_reg *src;
+
+   uint8_t sources; /**< Number of fs_reg sources. */
+
+   /**
+    * Execution size of the instruction.  This is used by the generator to
+    * generate the correct binary for the given fs_inst.  Current valid
+    * values are 1, 8, 16.
+    */
+   uint8_t exec_size;
+
+   /* Chooses which flag subregister (f0.0 or f0.1) is used for conditional
+    * mod and predication.
+    */
+   uint8_t flag_subreg;
+
+   uint8_t regs_written; /**< Number of vgrfs written by a SEND message, or 1 */
+   bool eot:1;
+   bool force_uncompressed:1;
+   bool force_sechalf:1;
+   bool pi_noperspective:1;   /**< Pixel interpolator noperspective flag */
+};
+
+#endif