[PATCH] i965: get the jmp distance by instruction index

[Yuanhan Liu]

If dynamic instruction store size is enabled, while after the brw_JMPI()
and before the brw_land_fwd_jump() function, the eu instruction store
base address(p->store) may change. Thus, the safe way to reference the
jmp instruction is by index instead of by the instruction address.

v2: comments from Eric, don't change the prototype of brw_JMPI

Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
---
 src/mesa/drivers/dri/i965/brw_eu.h      |    3 +--
 src/mesa/drivers/dri/i965/brw_eu_emit.c |    7 +++----
 src/mesa/drivers/dri/i965/brw_sf_emit.c |    8 ++++----
 src/mesa/drivers/dri/i965/brw_wm_emit.c |    4 ++--
 4 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_eu.h b/src/mesa/drivers/dri/i965/brw_eu.h
index 7fd387b..cc2f618 100644
--- a/src/mesa/drivers/dri/i965/brw_eu.h
+++ b/src/mesa/drivers/dri/i965/brw_eu.h
@@ -1032,8 +1032,7 @@ struct brw_instruction *brw_CONT(struct brw_compile *p);
 struct brw_instruction *gen6_CONT(struct brw_compile *p);
 /* Forward jumps:
  */
-void brw_land_fwd_jump(struct brw_compile *p, 
-		       struct brw_instruction *jmp_insn);
+void brw_land_fwd_jump(struct brw_compile *p, int jmp_insn_idx);
 
 
 
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 277bd74..b2ab013 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -1452,11 +1452,10 @@ struct brw_instruction *brw_WHILE(struct brw_compile *p)
 
 /* FORWARD JUMPS:
  */
-void brw_land_fwd_jump(struct brw_compile *p, 
-		       struct brw_instruction *jmp_insn)
+void brw_land_fwd_jump(struct brw_compile *p, int jmp_insn_idx)
 {
    struct intel_context *intel = &p->brw->intel;
-   struct brw_instruction *landing = &p->store[p->nr_insn];
+   struct brw_instruction *jmp_insn = &p->store[jmp_insn_idx];
    GLuint jmpi = 1;
 
    if (intel->gen >= 5)
@@ -1465,7 +1464,7 @@ void brw_land_fwd_jump(struct brw_compile *p,
    assert(jmp_insn->header.opcode == BRW_OPCODE_JMPI);
    assert(jmp_insn->bits1.da1.src1_reg_file == BRW_IMMEDIATE_VALUE);
 
-   jmp_insn->bits3.ud = jmpi * ((landing - jmp_insn) - 1);
+   jmp_insn->bits3.ud = jmpi * (p->nr_insn - jmp_insn_idx - 1);
 }
 
 
diff --git a/src/mesa/drivers/dri/i965/brw_sf_emit.c b/src/mesa/drivers/dri/i965/brw_sf_emit.c
index fe3341c..1ee0098 100644
--- a/src/mesa/drivers/dri/i965/brw_sf_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_sf_emit.c
@@ -717,7 +717,7 @@ void brw_emit_anyprim_setup( struct brw_sf_compile *c )
    struct brw_reg payload_prim = brw_uw1_reg(BRW_GENERAL_REGISTER_FILE, 1, 0);
    struct brw_reg payload_attr = get_element_ud(brw_vec1_reg(BRW_GENERAL_REGISTER_FILE, 1, 0), 0); 
    struct brw_reg primmask;
-   struct brw_instruction *jmp;
+   int jmp;
    struct brw_reg v1_null_ud = vec1(retype(brw_null_reg(), BRW_REGISTER_TYPE_UD));
    
    GLuint saveflag;
@@ -738,7 +738,7 @@ void brw_emit_anyprim_setup( struct brw_sf_compile *c )
 					       (1<<_3DPRIM_POLYGON) |
 					       (1<<_3DPRIM_RECTLIST) |
 					       (1<<_3DPRIM_TRIFAN_NOSTIPPLE)));
-   jmp = brw_JMPI(p, ip, ip, brw_imm_d(0));
+   jmp = brw_JMPI(p, ip, ip, brw_imm_d(0)) - p->store;
    {
       saveflag = p->flag_value;
       brw_push_insn_state(p); 
@@ -759,7 +759,7 @@ void brw_emit_anyprim_setup( struct brw_sf_compile *c )
 					       (1<<_3DPRIM_LINESTRIP_CONT) |
 					       (1<<_3DPRIM_LINESTRIP_BF) |
 					       (1<<_3DPRIM_LINESTRIP_CONT_BF)));
-   jmp = brw_JMPI(p, ip, ip, brw_imm_d(0));
+   jmp = brw_JMPI(p, ip, ip, brw_imm_d(0)) - p->store;
    {
       saveflag = p->flag_value;
       brw_push_insn_state(p); 
@@ -772,7 +772,7 @@ void brw_emit_anyprim_setup( struct brw_sf_compile *c )
 
    brw_set_conditionalmod(p, BRW_CONDITIONAL_Z);
    brw_AND(p, v1_null_ud, payload_attr, brw_imm_ud(1<<BRW_SPRITE_POINT_ENABLE));
-   jmp = brw_JMPI(p, ip, ip, brw_imm_d(0));
+   jmp = brw_JMPI(p, ip, ip, brw_imm_d(0)) - p->store;
    {
       saveflag = p->flag_value;
       brw_push_insn_state(p); 
diff --git a/src/mesa/drivers/dri/i965/brw_wm_emit.c b/src/mesa/drivers/dri/i965/brw_wm_emit.c
index 5905ba9..5305d5a 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_emit.c
@@ -1528,7 +1528,7 @@ void emit_fb_write(struct brw_wm_compile *c,
    else {
       struct brw_reg v1_null_ud = vec1(retype(brw_null_reg(), BRW_REGISTER_TYPE_UD));
       struct brw_reg ip = brw_ip_reg();
-      struct brw_instruction *jmp;
+      int jmp;
       
       brw_set_compression_control(p, BRW_COMPRESSION_NONE);
       brw_set_conditionalmod(p, BRW_CONDITIONAL_Z);
@@ -1537,7 +1537,7 @@ void emit_fb_write(struct brw_wm_compile *c,
 	      get_element_ud(brw_vec8_grf(1,0), 6), 
 	      brw_imm_ud(1<<26)); 
 
-      jmp = brw_JMPI(p, ip, ip, brw_imm_w(0));
+      jmp = brw_JMPI(p, ip, ip, brw_imm_w(0)) - p->store;
       {
 	 emit_aa(c, arg1, 2);
 	 fire_fb_write(c, 0, nr, target, eot);
-- 
1.7.4.4