[Mesa-dev] [PATCH 3/6] nv50/ir: replace post_ra_dead by Instruction::isDead

[Karol Herbst]

Signed-off-by: Karol Herbst <karolherbst at gmail.com>
---
 src/gallium/drivers/nouveau/codegen/nv50_ir.h        |  2 +-
 .../drivers/nouveau/codegen/nv50_ir_peephole.cpp     | 20 +++++++-------------
 2 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir.h b/src/gallium/drivers/nouveau/codegen/nv50_ir.h
index bedbdcc..9d1a72f 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir.h
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir.h
@@ -829,7 +829,7 @@ public:
    }
 
    inline bool isPseudo() const { return op < OP_MOV; }
-   bool isDead() const;
+   bool isDead(bool postRA = false) const;
    bool isNop() const;
    bool isCommutationLegal(const Instruction *) const; // must be adjacent !
    bool isActionEqual(const Instruction *) const;
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
index 780820f..3fcadd9 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -61,7 +61,7 @@ Instruction::isNop() const
    return false;
 }
 
-bool Instruction::isDead() const
+bool Instruction::isDead(bool postRA) const
 {
    if (op == OP_STORE ||
        op == OP_EXPORT ||
@@ -70,8 +70,11 @@ bool Instruction::isDead() const
        op == OP_WRSV)
       return false;
 
+   if (postRA && op == OP_MOV && subOp == NV50_IR_SUBOP_MOV_FINAL)
+      return false;
+
    for (int d = 0; defExists(d); ++d)
-      if (getDef(d)->refCount() || getDef(d)->reg.data.id >= 0)
+      if (getDef(d)->refCount() || (!postRA && getDef(d)->reg.data.id >= 0))
          return false;
 
    if (terminator || asFlow())
@@ -2959,15 +2962,6 @@ private:
    virtual bool visit(BasicBlock *);
 };
 
-static bool
-post_ra_dead(Instruction *i)
-{
-   for (int d = 0; i->defExists(d); ++d)
-      if (i->getDef(d)->refCount())
-         return false;
-   return true;
-}
-
 bool
 NV50PostRaConstantFolding::visit(BasicBlock *bb)
 {
@@ -3014,13 +3008,13 @@ NV50PostRaConstantFolding::visit(BasicBlock *bb)
             /* There's no post-RA dead code elimination, so do it here
              * XXX: if we add more code-removing post-RA passes, we might
              *      want to create a post-RA dead-code elim pass */
-            if (post_ra_dead(vtmp->getInsn())) {
+            if (vtmp->getInsn()->isDead(true)) {
                Value *src = vtmp->getInsn()->getSrc(0);
                // Careful -- splits will have already been removed from the
                // functions. Don't double-delete.
                if (vtmp->getInsn()->bb)
                   delete_Instruction(prog, vtmp->getInsn());
-               if (src->getInsn() && post_ra_dead(src->getInsn()))
+               if (src->getInsn() && src->getInsn()->isDead(true))
                   delete_Instruction(prog, src->getInsn());
             }
 
-- 
2.10.0