commit 4bb7a41ed635960e1551e8b5a1aea9ee4d1758a3
author Richard Henderson <rth@twiddle.net> Mon Sep 09 17:03:24 2013 -0700
committer Richard Henderson <rth@twiddle.net> Mon Apr 28 11:06:34 2014 -0700
tree 68ed85758ad038717290bd8f4aa4dae00d08935b
parent 71b926992e0e0a0da078873480c6fc1dd65af6fc

tcg: Add INDEX_op_trunc_shr_i32

Let the backend do something special for truncation.

Signed-off-by: Richard Henderson <rth@twiddle.net>

tcg/optimize.c

diff --git a/tcg/optimize.c b/tcg/optimize.c
index c447062..0302f4f 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -228,6 +228,7 @@
     case INDEX_op_shr_i32:
         return (uint32_t)x >> (y & 31);
 
+    case INDEX_op_trunc_shr_i32:
     case INDEX_op_shr_i64:
         return (uint64_t)x >> (y & 63);
 
@@ -830,6 +831,10 @@
             }
             break;
 
+        case INDEX_op_trunc_shr_i32:
+            mask = (uint64_t)temps[args[1]].mask >> args[2];
+            break;
+
         CASE_OP_32_64(shl):
             if (temps[args[2]].state == TCG_TEMP_CONST) {
                 tmp = temps[args[2]].val & (TCG_TARGET_REG_BITS - 1);
@@ -1021,6 +1026,17 @@
             }
             goto do_default;
 
+        case INDEX_op_trunc_shr_i32:
+            if (temps[args[1]].state == TCG_TEMP_CONST) {
+                s->gen_opc_buf[op_index] = op_to_movi(op);
+                tmp = do_constant_folding(op, temps[args[1]].val, args[2]);
+                tcg_opt_gen_movi(gen_args, args[0], tmp);
+                gen_args += 2;
+                args += 3;
+                break;
+            }
+            goto do_default;
+
         CASE_OP_32_64(add):
         CASE_OP_32_64(sub):
         CASE_OP_32_64(mul):