Mesa (master): pan/midgard: Remove mir_has_multiple_writes

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Module: Mesa
Branch: master
Commit: c59fae0fef4a4977811384c515ce35319c145708
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c59fae0fef4a4977811384c515ce35319c145708

Author: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
Date:   Thu Oct  3 16:01:51 2019 -0400

pan/midgard: Remove mir_has_multiple_writes

We already enforce this with the SSA/register distinction in the
backend. There is no need to duplicate this logic merely for an assert.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>

---

 src/panfrost/midgard/compiler.h         |  1 -
 src/panfrost/midgard/midgard_compile.c  |  1 -
 src/panfrost/midgard/midgard_liveness.c | 16 ----------------
 3 files changed, 18 deletions(-)

diff --git a/src/panfrost/midgard/compiler.h b/src/panfrost/midgard/compiler.h
index b0b5ba07143..a338557a7a0 100644
--- a/src/panfrost/midgard/compiler.h
+++ b/src/panfrost/midgard/compiler.h
@@ -604,7 +604,6 @@ void mir_lower_special_reads(compiler_context *ctx);
 struct ra_graph* allocate_registers(compiler_context *ctx, bool *spilled);
 void install_registers(compiler_context *ctx, struct ra_graph *g);
 bool mir_is_live_after(compiler_context *ctx, midgard_block *block, midgard_instruction *start, int src);
-bool mir_has_multiple_writes(compiler_context *ctx, int src);
 
 void mir_create_pipeline_registers(compiler_context *ctx);
 
diff --git a/src/panfrost/midgard/midgard_compile.c b/src/panfrost/midgard/midgard_compile.c
index 857e6c70112..3719ac869b4 100644
--- a/src/panfrost/midgard/midgard_compile.c
+++ b/src/panfrost/midgard/midgard_compile.c
@@ -2146,7 +2146,6 @@ midgard_opt_pos_propagate(compiler_context *ctx, midgard_block *block)
                 /* TODO: Registers? */
                 unsigned src = ins->src[1];
                 if (src & IS_REG) continue;
-                assert(!mir_has_multiple_writes(ctx, src));
 
                 /* There might be a source modifier, too */
                 if (mir_nontrivial_source2_mod(ins)) continue;
diff --git a/src/panfrost/midgard/midgard_liveness.c b/src/panfrost/midgard/midgard_liveness.c
index 155e1cc3514..4766603a885 100644
--- a/src/panfrost/midgard/midgard_liveness.c
+++ b/src/panfrost/midgard/midgard_liveness.c
@@ -90,19 +90,3 @@ mir_is_live_after(compiler_context *ctx, midgard_block *block, midgard_instructi
 
         return succ;
 }
-
-/* Just a quick check -- is it written more than once? (I.e. are we definitely
- * not SSA?) */
-
-bool
-mir_has_multiple_writes(compiler_context *ctx, int dest)
-{
-        unsigned write_count = 0;
-
-        mir_foreach_instr_global(ctx, ins) {
-                if (ins->dest == dest)
-                        write_count++;
-        }
-
-        return write_count > 1;
-}