Blame 0052-tcg-Optimize-movcond-for-constant-comparisons.patch

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From c489b380d3f827be91b5f8b80b88585fb4014fbb Mon Sep 17 00:00:00 2001
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From: Richard Henderson <rth@twiddle.net>
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Date: Fri, 21 Sep 2012 10:13:37 -0700
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Subject: [PATCH] tcg: Optimize movcond for constant comparisons
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Signed-off-by: Richard Henderson <rth@twiddle.net>
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Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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 tcg/optimize.c | 40 ++++++++++++++++++++++++++++++++++++++++
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 1 file changed, 40 insertions(+)
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diff --git a/tcg/optimize.c b/tcg/optimize.c
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index 9da333c..26038a6 100644
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--- a/tcg/optimize.c
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+++ b/tcg/optimize.c
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@@ -394,6 +394,14 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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                 args[3] = tcg_swap_cond(args[3]);
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             }
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             break;
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+        CASE_OP_32_64(movcond):
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+            if (temps[args[1]].state == TCG_TEMP_CONST
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+                && temps[args[2]].state != TCG_TEMP_CONST) {
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+                tmp = args[1];
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+                args[1] = args[2];
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+                args[2] = tmp;
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+                args[5] = tcg_swap_cond(args[5]);
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+            }
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         default:
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             break;
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         }
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@@ -614,6 +622,38 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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             }
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             args += 4;
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             break;
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+        CASE_OP_32_64(movcond):
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+            if (temps[args[1]].state == TCG_TEMP_CONST
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+                && temps[args[2]].state == TCG_TEMP_CONST) {
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+                tmp = do_constant_folding_cond(op, temps[args[1]].val,
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+                                               temps[args[2]].val, args[5]);
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+                if (args[0] == args[4-tmp]
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+                    || (temps[args[4-tmp]].state == TCG_TEMP_COPY
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+                        && temps[args[4-tmp]].val == args[0])) {
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+                    gen_opc_buf[op_index] = INDEX_op_nop;
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+                } else if (temps[args[4-tmp]].state == TCG_TEMP_CONST) {
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+                    gen_opc_buf[op_index] = op_to_movi(op);
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+                    tcg_opt_gen_movi(gen_args, args[0], temps[args[4-tmp]].val,
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+                                     nb_temps, nb_globals);
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+                    gen_args += 2;
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+                } else {
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+                    gen_opc_buf[op_index] = op_to_mov(op);
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+                    tcg_opt_gen_mov(gen_args, args[0], args[4-tmp],
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+                                    nb_temps, nb_globals);
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+                    gen_args += 2;
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+                }
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+            } else {
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+                reset_temp(args[0], nb_temps, nb_globals);
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+                gen_args[0] = args[0];
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+                gen_args[1] = args[1];
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+                gen_args[2] = args[2];
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+                gen_args[3] = args[3];
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+                gen_args[4] = args[4];
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+                gen_args[5] = args[5];
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+                gen_args += 6;
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+            }
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+            args += 6;
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+            break;
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         case INDEX_op_call:
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             nb_call_args = (args[0] >> 16) + (args[0] & 0xffff);
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             if (!(args[nb_call_args + 1] & (TCG_CALL_CONST | TCG_CALL_PURE))) {
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-- 
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1.7.12.1
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