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, 14 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_wm.c b/src/mesa/drivers/dri/i965/brw_wm.c
index 964ee104c2..d8971321f3 100644
--- a/src/mesa/drivers/dri/i965/brw_wm.c
+++ b/src/mesa/drivers/dri/i965/brw_wm.c
@@ -152,8 +152,22 @@ static void do_wm_prog( struct brw_context *brw,
           */
          return;
       }
+      c->instruction = _mesa_calloc(BRW_WM_MAX_INSN * sizeof(*c->instruction));
+      c->prog_instructions = _mesa_calloc(BRW_WM_MAX_INSN *
+					  sizeof(*c->prog_instructions));
+      c->vreg = _mesa_calloc(BRW_WM_MAX_VREG * sizeof(*c->vreg));
+      c->refs = _mesa_calloc(BRW_WM_MAX_REF * sizeof(*c->refs));
+      c->vreg = _mesa_calloc(BRW_WM_MAX_VREG * sizeof(*c->vreg));
    } else {
+      void *instruction = c->instruction;
+      void *prog_instructions = c->prog_instructions;
+      void *vreg = c->vreg;
+      void *refs = c->refs;
       memset(c, 0, sizeof(*brw->wm.compile_data));
+      c->instruction = instruction;
+      c->prog_instructions = prog_instructions;
+      c->vreg = vreg;
+      c->refs = refs;
    }
    memcpy(&c->key, key, sizeof(*key));