i965: Stop setting predication from brw_set_conditionalmod.

brw_set_conditionalmod has traditionally been complex: it causes
conditionalmod to be set for the next instruction, and then predication
to be set on all future instructions after that.

We may want to generate a flag condition and not use it immediately,
due to instruction scheduling or the like.  Even if not, it's easy
to set things explicitly, and that's clearer.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>

4 files changed, 11 insertions, 5 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_clip_line.c b/src/mesa/drivers/dri/i965/brw_clip_line.c
index 42289e7..cc5fc38 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_line.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_line.c
@@ -160,10 +160,9 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
       brw_AND(p, brw_null_reg(), get_element_ud(c->reg.R0, 2),
               brw_imm_ud(1<<20));
       brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(0x3f));
+      brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
    }
 
-   brw_set_predicate_control(p, BRW_PREDICATE_NONE);
-
    /* Set the initial vertex source mask: The first 6 planes are the bounds
     * of the view volume; the next 8 planes are the user clipping planes.
     */
@@ -271,9 +270,12 @@ static void clip_and_emit_line( struct brw_clip_compile *c )
       brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ);
       brw_SHR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(1));
       brw_SHR(p, c->reg.vertex_src_mask, c->reg.vertex_src_mask, brw_imm_ud(1));
+      brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
       brw_ADD(p, c->reg.clipdistance_offset, c->reg.clipdistance_offset, brw_imm_w(sizeof(float)));
+      brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
    }
    brw_WHILE(p);
+   brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
 
    brw_ADD(p, c->reg.t, c->reg.t0, c->reg.t1);
    brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_L, c->reg.t, brw_imm_f(1.0));
diff --git a/src/mesa/drivers/dri/i965/brw_clip_tri.c b/src/mesa/drivers/dri/i965/brw_clip_tri.c
index 289f4cc..9118cf7 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_tri.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_tri.c
@@ -407,6 +407,7 @@ void brw_clip_tri( struct brw_clip_compile *c )
 	    brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1));
 	 }
 	 brw_WHILE(p);
+         brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
 
 	 /* vtxPrev = *(outlist_ptr-1)  OR: outlist[nr_verts-1]
 	  * inlist = outlist
@@ -485,6 +486,7 @@ void brw_clip_tri_emit_polygon(struct brw_clip_compile *c)
 	 brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1));
       }
       brw_WHILE(p);
+      brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
 
       brw_clip_emit_vue(c, v0, BRW_URB_WRITE_EOT_COMPLETE,
                         ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT)
diff --git a/src/mesa/drivers/dri/i965/brw_clip_unfilled.c b/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
index 164a965..d8deaa4 100644
--- a/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
+++ b/src/mesa/drivers/dri/i965/brw_clip_unfilled.c
@@ -237,7 +237,7 @@ static void merge_edgeflags( struct brw_clip_compile *c )
                              brw_varying_to_offset(&c->vue_map,
                                                    VARYING_SLOT_EDGE)),
               brw_imm_f(0));
-      brw_set_predicate_control(p, BRW_PREDICATE_NONE);
+      brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
 
       brw_set_conditionalmod(p, BRW_CONDITIONAL_EQ);
       brw_AND(p, vec1(brw_null_reg()), get_element_ud(c->reg.R0, 2), brw_imm_ud(1<<9));
@@ -245,7 +245,7 @@ static void merge_edgeflags( struct brw_clip_compile *c )
                              brw_varying_to_offset(&c->vue_map,
                                                    VARYING_SLOT_EDGE)),
               brw_imm_f(0));
-      brw_set_predicate_control(p, BRW_PREDICATE_NONE);
+      brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
    }
    brw_ENDIF(p);
 }
@@ -295,6 +295,7 @@ static void emit_lines(struct brw_clip_compile *c,
 	 brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1));
       }
       brw_WHILE(p);
+      brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
    }
 
    /* v1ptr = &inlist[nr_verts]
@@ -333,6 +334,7 @@ static void emit_lines(struct brw_clip_compile *c,
       brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1));
    }
    brw_WHILE(p);
+   brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
 }
 
 
@@ -375,6 +377,7 @@ static void emit_points(struct brw_clip_compile *c,
       brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1));
    }
    brw_WHILE(p);
+   brw_last_inst->header.predicate_control = BRW_PREDICATE_NORMAL;
 }
 
 
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 0bf6e3e..d31e733 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -856,7 +856,6 @@ brw_next_insn(struct brw_compile *p, unsigned opcode)
 
    if (p->current->header.destreg__conditionalmod) {
       p->current->header.destreg__conditionalmod = 0;
-      p->current->header.predicate_control = BRW_PREDICATE_NORMAL;
    }
 
    insn->header.opcode = opcode;