i965: Pass start_offset to brw_set_uip_jip().

Without this, we would pass over the instructions in the SIMD8 program
(which is located earlier in the buffer) when brw_set_uip_jip() is
called to handle the SIMD16 program.

The assertion about compacted control flow was bogus: halt, cont, break
cannot be compacted because they have both JIP and UIP. Instead, we
should never see a compacted instruction in this code at all.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

src/mesa/drivers/dri/i965/brw_eu.h

@@ -526,7 +526,7 @@ void brw_math_invert( struct brw_codegen *p,
 
 void brw_set_src1(struct brw_codegen *p, brw_inst *insn, struct brw_reg reg);
 
-void brw_set_uip_jip(struct brw_codegen *p);
+void brw_set_uip_jip(struct brw_codegen *p, int start_offset);
 
 enum brw_conditional_mod brw_negate_cmod(uint32_t cmod);
 enum brw_conditional_mod brw_swap_cmod(uint32_t cmod);

src/mesa/drivers/dri/i965/brw_eu_emit.c

@@ -2775,7 +2775,7 @@ brw_find_loop_end(struct brw_codegen *p, int start_offset)
  * BREAK, CONT, and HALT instructions to their correct locations.
  */
 void
-brw_set_uip_jip(struct brw_codegen *p)
+brw_set_uip_jip(struct brw_codegen *p, int start_offset)
 {
    const struct brw_device_info *devinfo = p->devinfo;
    int offset;
@@ -2786,17 +2786,9 @@ brw_set_uip_jip(struct brw_codegen *p)
    if (devinfo->gen < 6)
       return;
 
-   for (offset = 0; offset < p->next_insn_offset;
-        offset = next_offset(devinfo, store, offset)) {
+   for (offset = start_offset; offset < p->next_insn_offset; offset += 16) {
       brw_inst *insn = store + offset;
-
-      if (brw_inst_cmpt_control(devinfo, insn)) {
-	 /* Fixups for compacted BREAK/CONTINUE not supported yet. */
-         assert(brw_inst_opcode(devinfo, insn) != BRW_OPCODE_BREAK &&
-                brw_inst_opcode(devinfo, insn) != BRW_OPCODE_CONTINUE &&
-                brw_inst_opcode(devinfo, insn) != BRW_OPCODE_HALT);
-	 continue;
-      }
+      assert(brw_inst_cmpt_control(devinfo, insn) == 0);
 
       int block_end_offset = brw_find_next_block_end(p, offset);
       switch (brw_inst_opcode(devinfo, insn)) {

src/mesa/drivers/dri/i965/brw_fs_generator.cpp

@@ -2127,7 +2127,7 @@ fs_generator::generate_code(const cfg_t *cfg, int dispatch_width)
       }
    }
 
-   brw_set_uip_jip(p);
+   brw_set_uip_jip(p, start_offset);
    annotation_finalize(&annotation, p->next_insn_offset);
 
 #ifndef NDEBUG

src/mesa/drivers/dri/i965/brw_vec4_generator.cpp

@@ -2024,7 +2024,7 @@ generate_code(struct brw_codegen *p,
       }
    }
 
-   brw_set_uip_jip(p);
+   brw_set_uip_jip(p, 0);
    annotation_finalize(&annotation, p->next_insn_offset);
 
 #ifndef NDEBUG