vc4: Make r4-writes implicitly move to a temp, and allocate temps to r4.

Previously, SFU values always moved to a temporary, and TLB color reads
and texture reads always lived in r4.  Instead, we can have these results
just be normal temporaries, and the register allocator can leave the
values in r4 when they don't interfere with anything else using r4.

shader-db results:
total instructions in shared programs: 100809 -> 100040 (-0.76%)
instructions in affected programs:     42383 -> 41614 (-1.81%)

1 files changed, 0 insertions, 13 deletions

diff --git a/src/gallium/drivers/vc4/vc4_qir.h b/src/gallium/drivers/vc4/vc4_qir.h
index e2d2574f1b1..7a74018d9af 100644
--- a/src/gallium/drivers/vc4/vc4_qir.h
+++ b/src/gallium/drivers/vc4/vc4_qir.h
@@ -158,10 +158,6 @@ enum qop {
          * the destination
          */
         QOP_TEX_RESULT,
-        QOP_R4_UNPACK_A,
-        QOP_R4_UNPACK_B,
-        QOP_R4_UNPACK_C,
-        QOP_R4_UNPACK_D
 };
 
 struct queued_qpu_inst {
@@ -442,7 +438,6 @@ bool qir_is_multi_instruction(struct qinst *inst);
 bool qir_is_tex(struct qinst *inst);
 bool qir_depends_on_flags(struct qinst *inst);
 bool qir_writes_r4(struct qinst *inst);
-bool qir_reads_r4(struct qinst *inst);
 bool qir_src_needs_a_file(struct qinst *inst);
 struct qreg qir_follow_movs(struct vc4_compile *c, struct qreg reg);
 
@@ -579,14 +574,6 @@ QIR_NODST_1(TLB_DISCARD_SETUP)
 QIR_NODST_1(TLB_STENCIL_SETUP)
 
 static inline struct qreg
-qir_R4_UNPACK(struct vc4_compile *c, struct qreg r4, int i)
-{
-        struct qreg t = qir_get_temp(c);
-        qir_emit(c, qir_inst(QOP_R4_UNPACK_A + i, t, r4, c->undef));
-        return t;
-}
-
-static inline struct qreg
 qir_UNPACK_8_F(struct vc4_compile *c, struct qreg src, int i)
 {
         struct qreg t = qir_get_temp(c);