From 651721b2a55370cf04794d5ce397984c78fc0fec Mon Sep 17 00:00:00 2001
From: aurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Mon, 9 Mar 2009 18:50:24 +0000
Subject: [PATCH] targe-ppc: optimize mfcr and mtcrf

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6793 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-ppc/helper.h    |  3 ---
 target-ppc/op_helper.c | 24 ------------------------
 target-ppc/translate.c | 29 ++++++++++++++++++++++++++---
 3 files changed, 26 insertions(+), 30 deletions(-)

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 85cdd23c5c..5a04bee703 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -30,9 +30,6 @@ DEF_HELPER_1(dcbz_970, void, tl)
 DEF_HELPER_1(icbi, void, tl)
 DEF_HELPER_4(lscbx, tl, tl, i32, i32, i32)
 
-DEF_HELPER_0(load_cr, tl)
-DEF_HELPER_2(store_cr, void, tl, i32)
-
 #if defined(TARGET_PPC64)
 DEF_HELPER_2(mulhd, i64, i64, i64)
 DEF_HELPER_2(mulhdu, i64, i64, i64)
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index f21f695db6..2c6a27fcba 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -53,30 +53,6 @@ void helper_raise_exception (uint32_t exception)
     helper_raise_exception_err(exception, 0);
 }
 
-/*****************************************************************************/
-/* Registers load and stores */
-target_ulong helper_load_cr (void)
-{
-    return (env->crf[0] << 28) |
-           (env->crf[1] << 24) |
-           (env->crf[2] << 20) |
-           (env->crf[3] << 16) |
-           (env->crf[4] << 12) |
-           (env->crf[5] << 8) |
-           (env->crf[6] << 4) |
-           (env->crf[7] << 0);
-}
-
-void helper_store_cr (target_ulong val, uint32_t mask)
-{
-    int i, sh;
-
-    for (i = 0, sh = 7; i < 8; i++, sh--) {
-        if (mask & (1 << sh))
-            env->crf[i] = (val >> (sh * 4)) & 0xFUL;
-    }
-}
-
 /*****************************************************************************/
 /* SPR accesses */
 void helper_load_dump_spr (uint32_t sprn)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index e400cf2da1..0368c37430 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -3859,7 +3859,24 @@ GEN_HANDLER(mfcr, 0x1F, 0x13, 0x00, 0x00000801, PPC_MISC)
                             cpu_gpr[rD(ctx->opcode)], crn * 4);
         }
     } else {
-        gen_helper_load_cr(cpu_gpr[rD(ctx->opcode)]);
+        TCGv_i32 t0 = tcg_temp_new_i32();
+        tcg_gen_mov_i32(t0, cpu_crf[0]);
+        tcg_gen_shli_i32(t0, t0, 4);
+        tcg_gen_or_i32(t0, t0, cpu_crf[1]);
+        tcg_gen_shli_i32(t0, t0, 4);
+        tcg_gen_or_i32(t0, t0, cpu_crf[2]);
+        tcg_gen_shli_i32(t0, t0, 4);
+        tcg_gen_or_i32(t0, t0, cpu_crf[3]);
+        tcg_gen_shli_i32(t0, t0, 4);
+        tcg_gen_or_i32(t0, t0, cpu_crf[4]);
+        tcg_gen_shli_i32(t0, t0, 4);
+        tcg_gen_or_i32(t0, t0, cpu_crf[5]);
+        tcg_gen_shli_i32(t0, t0, 4);
+        tcg_gen_or_i32(t0, t0, cpu_crf[6]);
+        tcg_gen_shli_i32(t0, t0, 4);
+        tcg_gen_or_i32(t0, t0, cpu_crf[7]);
+        tcg_gen_extu_i32_tl(cpu_gpr[rD(ctx->opcode)], t0);
+        tcg_temp_free_i32(t0);
     }
 }
 
@@ -3956,8 +3973,14 @@ GEN_HANDLER(mtcrf, 0x1F, 0x10, 0x04, 0x00000801, PPC_MISC)
             tcg_temp_free_i32(temp);
         }
     } else {
-        TCGv_i32 temp = tcg_const_i32(crm);
-        gen_helper_store_cr(cpu_gpr[rS(ctx->opcode)], temp);
+        TCGv_i32 temp = tcg_temp_new_i32();
+        tcg_gen_trunc_tl_i32(temp, cpu_gpr[rS(ctx->opcode)]);
+        for (crn = 0 ; crn < 8 ; crn++) {
+            if (crm & (1 << crn)) {
+                    tcg_gen_shri_i32(cpu_crf[7 - crn], temp, crn * 4);
+                    tcg_gen_andi_i32(cpu_crf[7 - crn], cpu_crf[7 - crn], 0xf);
+            }
+        }
         tcg_temp_free_i32(temp);
     }
 }