diff mbox

[RFC,14/14] tcg/optimize: Fold movcond 0/1 into setcond

Message ID 1479325910-9060-15-git-send-email-rth@twiddle.net
State New
Headers show

Commit Message

Richard Henderson Nov. 16, 2016, 7:51 p.m. UTC 
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 tcg/optimize.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
diff mbox

Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 06a8c13..28ce624 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1143,6 +1143,21 @@  void tcg_optimize(TCGContext *s)
                 tcg_opt_gen_mov(s, op, args, args[0], args[4-tmp]);
                 break;
             }
+            if (temp_is_const(args[3]) && temp_is_const(args[4])) {
+                tcg_target_ulong tv = temp_info(args[3])->val;
+                tcg_target_ulong fv = temp_info(args[4])->val;
+                TCGCond cond = args[5];
+                if (fv == 1 && tv == 0) {
+                    cond = tcg_invert_cond(cond);
+                } else if (!(tv == 1 && fv == 0)) {
+                    goto do_default;
+                }
+                args[3] = cond;
+                op->opc = opc = (opc == INDEX_op_movcond_i32
+                                 ? INDEX_op_setcond_i32
+                                 : INDEX_op_setcond_i64);
+                nb_iargs = 2;
+            }
             goto do_default;
 
         case INDEX_op_add2_i32: