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 d8e52982b686d6689cfc8cc54abf20fa5c345d53..2d100728724fdf7be659951b593c4f559510d253 100644 (file)
--- a/src/panfrost/midgard/mir.c
+++ b/src/panfrost/midgard/mir.c
@@ -109,13 +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;
@@ -128,7 +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)
 {
@@ -146,6 +150,10 @@ 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;
@@ -175,3 +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;
+}