pan/midgard: Introduce invert field

[mesa.git] / src / panfrost / midgard / mir.c

diff --git a/src/panfrost/midgard/mir.c b/src/panfrost/midgard/mir.c
index 2c449e0684eeecdc337504c81cc81a9f8a697ebd..2d100728724fdf7be659951b593c4f559510d253 100644 (file)
--- a/src/panfrost/midgard/mir.c
+++ b/src/panfrost/midgard/mir.c
@@ -65,6 +65,20 @@ mir_rewrite_index_dst(compiler_context *ctx, unsigned old, unsigned new)
         }
 }
 
+void
+mir_rewrite_index_dst_tag(compiler_context *ctx, unsigned old, unsigned new, unsigned tag)
+{
+        mir_foreach_instr_global(ctx, ins) {
+                if (ins->type != tag)
+                        continue;
+
+                if (ins->ssa_args.dest == old)
+                        ins->ssa_args.dest = new;
+        }
+}
+
+
+
 void
 mir_rewrite_index(compiler_context *ctx, unsigned old, unsigned new)
 {
@@ -95,13 +109,18 @@ mir_single_use(compiler_context *ctx, unsigned value)
 }
 
 bool
-mir_nontrivial_mod(midgard_vector_alu_src src, bool is_int, unsigned mask)
+mir_nontrivial_raw_mod(midgard_vector_alu_src src, bool is_int)
 {
-        /* abs or neg */
-        if (!is_int && src.mod) return true;
+        if (is_int)
+                return src.mod == midgard_int_shift;
+        else
+                return src.mod;
+}
 
-        /* Other int mods don't matter in isolation */
-        if (is_int && src.mod == midgard_int_shift) return true;
+bool
+mir_nontrivial_mod(midgard_vector_alu_src src, bool is_int, unsigned mask)
+{
+        if (mir_nontrivial_raw_mod(src, is_int)) return true;
 
         /* size-conversion */
         if (src.half) return true;
@@ -114,7 +133,6 @@ mir_nontrivial_mod(midgard_vector_alu_src src, bool is_int, unsigned mask)
 
         return false;
 }
-
 bool
 mir_nontrivial_source2_mod(midgard_instruction *ins)
 {
@@ -126,6 +144,26 @@ mir_nontrivial_source2_mod(midgard_instruction *ins)
         return mir_nontrivial_mod(src2, is_int, ins->mask);
 }
 
+bool
+mir_nontrivial_outmod(midgard_instruction *ins)
+{
+        bool is_int = midgard_is_integer_op(ins->alu.op);
+        unsigned mod = ins->alu.outmod;
+
+        /* Pseudo-outmod */
+        if (ins->invert)
+                return true;
+
+        /* Type conversion is a sort of outmod */
+        if (ins->alu.dest_override != midgard_dest_override_none)
+                return true;
+
+        if (is_int)
+                return mod != midgard_outmod_int_wrap;
+        else
+                return mod != midgard_outmod_none;
+}
+
 /* Checks if an index will be used as a special register -- basically, if we're
  * used as the input to a non-ALU op */
 
@@ -145,3 +183,62 @@ mir_special_index(compiler_context *ctx, unsigned idx)
 
         return false;
 }
+
+/* Is a node written before a given instruction? */
+
+bool
+mir_is_written_before(compiler_context *ctx, midgard_instruction *ins, unsigned node)
+{
+        if ((node < 0) || (node >= SSA_FIXED_MINIMUM))
+                return true;
+
+        mir_foreach_instr_global(ctx, q) {
+                if (q == ins)
+                        break;
+
+                if (q->ssa_args.dest == node)
+                        return true;
+        }
+
+        return false;
+}
+
+/* Creates a mask of the components of a node read by an instruction, by
+ * analyzing the swizzle with respect to the instruction's mask. E.g.:
+ *
+ *  fadd r0.xz, r1.yyyy, r2.zwyx
+ *
+ * will return a mask of Z/Y for r2
+ */
+
+static unsigned
+mir_mask_of_read_components_single(unsigned src, unsigned outmask)
+{
+        midgard_vector_alu_src s = vector_alu_from_unsigned(src);
+        unsigned mask = 0;
+
+        for (unsigned c = 0; c < 4; ++c) {
+                if (!(outmask & (1 << c))) continue;
+
+                unsigned comp = (s.swizzle >> (2*c)) & 3;
+                mask |= (1 << comp);
+        }
+
+        return mask;
+}
+
+unsigned
+mir_mask_of_read_components(midgard_instruction *ins, unsigned node)
+{
+        assert(ins->type == TAG_ALU_4);
+
+        unsigned mask = 0;
+
+        if (ins->ssa_args.src0 == node)
+                mask |= mir_mask_of_read_components_single(ins->alu.src1, ins->mask);
+
+        if (ins->ssa_args.src1 == node && !ins->ssa_args.inline_constant)
+                mask |= mir_mask_of_read_components_single(ins->alu.src2, ins->mask);
+
+        return mask;
+}