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[6/8] tcg/optimize: swap brcond/setcond arguments when possible

Message ID 1346943657-17256-7-git-send-email-aurelien@aurel32.net
State New
Headers show

Commit Message

Aurelien Jarno Sept. 6, 2012, 3 p.m. UTC 
brcond and setcond ops are not commutative, but it's easy to compute the
new condition after swapping the arguments. Try to always put the constant
argument in second position like for commutative ops, to help backends to
generate better code.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 tcg/optimize.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
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Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 1698ba3..7debc8a 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -318,6 +318,24 @@  static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
                 args[2] = tmp;
             }
             break;
+        CASE_OP_32_64(brcond):
+            if (temps[args[0]].state == TCG_TEMP_CONST
+                && temps[args[1]].state != TCG_TEMP_CONST) {
+                tmp = args[0];
+                args[0] = args[1];
+                args[1] = tmp;
+                args[2] = tcg_swap_cond(args[2]);
+            }
+            break;
+        CASE_OP_32_64(setcond):
+            if (temps[args[1]].state == TCG_TEMP_CONST
+                && temps[args[2]].state != TCG_TEMP_CONST) {
+                tmp = args[1];
+                args[1] = args[2];
+                args[2] = tmp;
+                args[3] = tcg_swap_cond(args[3]);
+            }
+            break;
         default:
             break;
         }