tcg: Introduce TYPE_CONST temporaries

These will hold a single constant for the duration of the TB.
They are hashed, so that each value has one temp across the TB.

Not used yet, this is all infrastructure.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 11 insertions, 2 deletions

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 433d2540f4..16b0aa7229 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -99,8 +99,17 @@ static void init_ts_info(TempOptInfo *infos,
         ts->state_ptr = ti;
         ti->next_copy = ts;
         ti->prev_copy = ts;
-        ti->is_const = false;
-        ti->mask = -1;
+        if (ts->kind == TEMP_CONST) {
+            ti->is_const = true;
+            ti->val = ti->mask = ts->val;
+            if (TCG_TARGET_REG_BITS > 32 && ts->type == TCG_TYPE_I32) {
+                /* High bits of a 32-bit quantity are garbage.  */
+                ti->mask |= ~0xffffffffull;
+            }
+        } else {
+            ti->is_const = false;
+            ti->mask = -1;
+        }
         set_bit(idx, temps_used->l);
     }
 }