0018-tcg-optimize-split-expression-simplification.patch

   1 From 16f29b266435c7eaffc5081c6bba4651d56a8ce8 Mon Sep 17 00:00:00 2001
   2 From: Aurelien Jarno <aurelien@aurel32.net>
   3 Date: Thu, 6 Sep 2012 16:47:13 +0200
   4 Subject: [PATCH] tcg/optimize: split expression simplification
   5
   6 Split expression simplification in multiple parts so that a given op
   7 can appear multiple times. This patch should not change anything.
   8
   9 Reviewed-by: Richard Henderson <rth@twiddle.net>
  10 Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
  11 Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
  12 ---
  13  tcg/optimize.c | 14 +++++++++++++-
  14  1 file changed, 13 insertions(+), 1 deletion(-)
  15
  16 diff --git a/tcg/optimize.c b/tcg/optimize.c
  17 index 9c65474..63f970d 100644
  18 --- a/tcg/optimize.c
  19 +++ b/tcg/optimize.c
  20 @@ -322,7 +322,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
  21              break;
  22          }
  23
  24 -        /* Simplify expression if possible. */
  25 +        /* Simplify expression for "op r, a, 0 => mov r, a" cases */
  26          switch (op) {
  27          CASE_OP_32_64(add):
  28          CASE_OP_32_64(sub):
  29 @@ -352,6 +352,12 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
  30                  continue;
  31              }
  32              break;
  33 +        default:
  34 +            break;
  35 +        }
  36 +
  37 +        /* Simplify expression for "op r, a, 0 => movi r, 0" cases */
  38 +        switch (op) {
  39          CASE_OP_32_64(mul):
  40              if ((temps[args[2]].state == TCG_TEMP_CONST
  41                  && temps[args[2]].val == 0)) {
  42 @@ -362,6 +368,12 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
  43                  continue;
  44              }
  45              break;
  46 +        default:
  47 +            break;
  48 +        }
  49 +
  50 +        /* Simplify expression for "op r, a, a => mov r, a" cases */
  51 +        switch (op) {
  52          CASE_OP_32_64(or):
  53          CASE_OP_32_64(and):
  54              if (args[1] == args[2]) {
  55 --
  56 1.7.12.1
  57