Patchwork [2/8] tcg/optimize: split expression simplification

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Submitter Aurelien Jarno
Date Sept. 6, 2012, 3 p.m.
Message ID <1346943657-17256-3-git-send-email-aurelien@aurel32.net>
Download mbox | patch
Permalink /patch/182240/
State New
Headers show

Comments

Aurelien Jarno - Sept. 6, 2012, 3 p.m.
Split expression simplification in multiple parts so that a given op
can appear multiple times. This patch should not change anything.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 tcg/optimize.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 9c65474..63f970d 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -322,7 +322,7 @@  static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
             break;
         }
 
-        /* Simplify expression if possible. */
+        /* Simplify expression for "op r, a, 0 => mov r, a" cases */
         switch (op) {
         CASE_OP_32_64(add):
         CASE_OP_32_64(sub):
@@ -352,6 +352,12 @@  static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
                 continue;
             }
             break;
+        default:
+            break;
+        }
+
+        /* Simplify expression for "op r, a, 0 => movi r, 0" cases */
+        switch (op) {
         CASE_OP_32_64(mul):
             if ((temps[args[2]].state == TCG_TEMP_CONST
                 && temps[args[2]].val == 0)) {
@@ -362,6 +368,12 @@  static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
                 continue;
             }
             break;
+        default:
+            break;
+        }
+
+        /* Simplify expression for "op r, a, a => mov r, a" cases */
+        switch (op) {
         CASE_OP_32_64(or):
         CASE_OP_32_64(and):
             if (args[1] == args[2]) {