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[Qemu-devel] [4384] Be more economical with local temporaries.
From: |
Thiemo Seufer |
Subject: |
[Qemu-devel] [4384] Be more economical with local temporaries. |
Date: |
Wed, 07 May 2008 18:18:12 +0000 |
Revision: 4384
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=4384
Author: ths
Date: 2008-05-07 18:18:09 +0000 (Wed, 07 May 2008)
Log Message:
-----------
Be more economical with local temporaries.
Modified Paths:
--------------
trunk/target-mips/translate.c
Modified: trunk/target-mips/translate.c
===================================================================
--- trunk/target-mips/translate.c 2008-05-07 18:04:29 UTC (rev 4383)
+++ trunk/target-mips/translate.c 2008-05-07 18:18:09 UTC (rev 4384)
@@ -424,6 +424,46 @@
/* global register indices */
static TCGv cpu_env, current_tc_gprs, cpu_T[2];
+/* The code generator doesn't like lots of temporaries, so maintain our own
+ cache for reuse within a function. */
+#define MAX_TEMPS 4
+static int num_temps;
+static TCGv temps[MAX_TEMPS];
+
+/* Allocate a temporary variable. */
+static TCGv new_tmp(void)
+{
+ TCGv tmp;
+ if (num_temps == MAX_TEMPS)
+ abort();
+
+ if (GET_TCGV(temps[num_temps]))
+ return temps[num_temps++];
+
+ tmp = tcg_temp_new(TCG_TYPE_I32);
+ temps[num_temps++] = tmp;
+ return tmp;
+}
+
+/* Release a temporary variable. */
+static void dead_tmp(TCGv tmp)
+{
+ int i;
+ num_temps--;
+ i = num_temps;
+ if (GET_TCGV(temps[i]) == GET_TCGV(tmp))
+ return;
+
+ /* Shuffle this temp to the last slot. */
+ while (GET_TCGV(temps[i]) != GET_TCGV(tmp))
+ i--;
+ while (i < num_temps) {
+ temps[i] = temps[i + 1];
+ i++;
+ }
+ temps[i] = tmp;
+}
+
/* General purpose registers moves */
const unsigned char *regnames[] =
{ "r0", "at", "v0", "v1", "a0", "a1", "a2", "a3",
@@ -464,7 +504,7 @@
/* Moves to/from shadow registers */
static inline void gen_op_load_srsgpr_T0(int reg)
{
- int r_tmp = tcg_temp_new(TCG_TYPE_I32);
+ int r_tmp = new_tmp();
tcg_gen_ld_i32(r_tmp, cpu_env, offsetof(CPUState, CP0_SRSCtl));
tcg_gen_shri_i32(r_tmp, r_tmp, CP0SRSCtl_PSS);
@@ -473,11 +513,12 @@
tcg_gen_add_i32(r_tmp, cpu_env, r_tmp);
tcg_gen_ld_tl(cpu_T[0], r_tmp, sizeof(target_ulong) * reg);
+ dead_tmp(r_tmp);
}
static inline void gen_op_store_srsgpr_T0(int reg)
{
- int r_tmp = tcg_temp_new(TCG_TYPE_I32);
+ int r_tmp = new_tmp();
tcg_gen_ld_i32(r_tmp, cpu_env, offsetof(CPUState, CP0_SRSCtl));
tcg_gen_shri_i32(r_tmp, r_tmp, CP0SRSCtl_PSS);
@@ -486,6 +527,7 @@
tcg_gen_add_i32(r_tmp, cpu_env, r_tmp);
tcg_gen_st_tl(cpu_T[0], r_tmp, sizeof(target_ulong) * reg);
+ dead_tmp(r_tmp);
}
/* Load immediates, zero being a special case. */
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