i965: avoid memsetting all the BRW_WM_MAX_INSN arrays for every compile.

For an app that's blowing out the state cache, like sauerbraten, the
memset of the giant arrays ended up taking 11% of the CPU even when only a
"few" of the entries got used.  With this, the WM program compile drops back
down to 1% of CPU time.

Bug #24981 (bisected to BRW_WM_MAX_INSN increase).

1 files changed, 3 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_wm_pass0.c b/src/mesa/drivers/dri/i965/brw_wm_pass0.c
index 602b1351ef..ff4c082d5e 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_pass0.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_pass0.c
@@ -42,12 +42,14 @@
 static struct brw_wm_ref *get_ref( struct brw_wm_compile *c )
 {
    assert(c->nr_refs < BRW_WM_MAX_REF);
+   memset(&c->refs[c->nr_refs], 0, sizeof(*c->refs));
    return &c->refs[c->nr_refs++];
 }
 
 static struct brw_wm_value *get_value( struct brw_wm_compile *c)
 {
    assert(c->nr_refs < BRW_WM_MAX_VREG);
+   memset(&c->vreg[c->nr_vreg], 0, sizeof(*c->vreg));
    return &c->vreg[c->nr_vreg++];
 }
 
@@ -55,6 +57,7 @@ static struct brw_wm_value *get_value( struct brw_wm_compile *c)
 static struct brw_wm_instruction *get_instruction( struct brw_wm_compile *c )
 {
    assert(c->nr_insns < BRW_WM_MAX_INSN);
+   memset(&c->instruction[c->nr_insns], 0, sizeof(*c->instruction));
    return &c->instruction[c->nr_insns++];
 }