From d9bdab86e83c1a8e1ed12fad67e76a2459a9e305 Mon Sep 17 00:00:00 2001
From: blueswir1 <blueswir1@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Sun, 16 Mar 2008 19:22:18 +0000
Subject: [PATCH]  Convert mulscc to TCG, add cc_src2

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4075 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-sparc/cpu.h       |  2 +-
 target-sparc/op.c        | 28 ------------------------
 target-sparc/translate.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 56 insertions(+), 30 deletions(-)

diff --git a/target-sparc/cpu.h b/target-sparc/cpu.h
index ae47a1b..a575bfd 100644
--- a/target-sparc/cpu.h
+++ b/target-sparc/cpu.h
@@ -186,7 +186,7 @@ typedef struct CPUSPARCState {
     target_ulong y;        /* multiply/divide register */
 
     /* emulator internal flags handling */
-    target_ulong cc_src;
+    target_ulong cc_src, cc_src2;
     target_ulong cc_dst;
 
     uint32_t psr;      /* processor state register */
diff --git a/target-sparc/op.c b/target-sparc/op.c
index 921699e..f4f05d2 100644
--- a/target-sparc/op.c
+++ b/target-sparc/op.c
@@ -195,34 +195,6 @@ void OPPROTO op_smul_T1_T0(void)
     env->y = res >> 32;
 }
 
-void OPPROTO op_mulscc_T1_T0(void)
-{
-    unsigned int b1, N, V, b2;
-    target_ulong src1;
-
-    N = FLAG_SET(PSR_NEG);
-    V = FLAG_SET(PSR_OVF);
-    b1 = N ^ V;
-    b2 = T0 & 1;
-    T0 = (b1 << 31) | (T0 >> 1);
-    if (!(env->y & 1))
-        T1 = 0;
-    /* do addition and update flags */
-    src1 = T0;
-    T0 += T1;
-    env->psr = 0;
-    if (!T0)
-        env->psr |= PSR_ZERO;
-    if ((int32_t) T0 < 0)
-        env->psr |= PSR_NEG;
-    if (T0 < src1)
-        env->psr |= PSR_CARRY;
-    if (((src1 ^ T1 ^ -1) & (src1 ^ T0)) & (1 << 31))
-        env->psr |= PSR_OVF;
-    env->y = (b2 << 31) | (env->y >> 1);
-    FORCE_RET();
-}
-
 void OPPROTO op_udiv_T1_T0(void)
 {
     uint64_t x0;
diff --git a/target-sparc/translate.c b/target-sparc/translate.c
index 72dd9f2..e819c6c 100644
--- a/target-sparc/translate.c
+++ b/target-sparc/translate.c
@@ -46,7 +46,7 @@
                          according to jump_pc[T2] */
 
 /* global register indexes */
-static TCGv cpu_env, cpu_T[3], cpu_regwptr, cpu_cc_src, cpu_cc_dst;
+static TCGv cpu_env, cpu_T[3], cpu_regwptr, cpu_cc_src, cpu_cc_src2, cpu_cc_dst;
 static TCGv cpu_psr, cpu_fsr, cpu_gregs[8];
 #ifdef TARGET_SPARC64
 static TCGv cpu_xcc;
@@ -710,6 +710,57 @@ static inline void gen_op_tsub_T1_T0_ccTV(void)
     gen_cc_C_sub(cpu_cc_src, cpu_T[1]);
 }
 
+static inline void gen_op_mulscc_T1_T0(void)
+{
+    TCGv r_temp;
+    int l1, l2;
+
+    l1 = gen_new_label();
+    l2 = gen_new_label();
+    r_temp = tcg_temp_new(TCG_TYPE_TL);
+
+    /* old op:
+    if (!(env->y & 1))
+        T1 = 0;
+    */
+    tcg_gen_ld_i32(r_temp, cpu_env, offsetof(CPUSPARCState, y));
+    tcg_gen_andi_i32(r_temp, r_temp, 0x1);
+    tcg_gen_brcond_i32(TCG_COND_EQ, r_temp, tcg_const_tl(0), l1);
+    tcg_gen_mov_tl(cpu_cc_src2, cpu_T[1]);
+    gen_op_jmp_label(l2);
+    gen_set_label(l1);
+    tcg_gen_movi_tl(cpu_cc_src2, 0);
+    gen_set_label(l2);
+
+    // b2 = T0 & 1;
+    // env->y = (b2 << 31) | (env->y >> 1);
+    tcg_gen_shli_i32(r_temp, cpu_T[0], 31);
+    tcg_gen_ld_i32(cpu_tmp0, cpu_env, offsetof(CPUSPARCState, y));
+    tcg_gen_shri_i32(cpu_tmp0, cpu_tmp0, 1);
+    tcg_gen_or_i32(cpu_tmp0, cpu_tmp0, r_temp);
+    tcg_gen_st_i32(cpu_tmp0, cpu_env, offsetof(CPUSPARCState, y));
+
+    // b1 = N ^ V;
+    gen_mov_reg_N(cpu_tmp0, cpu_psr);
+    gen_mov_reg_V(r_temp, cpu_psr);
+    tcg_gen_xor_tl(cpu_tmp0, cpu_tmp0, r_temp);
+
+    // T0 = (b1 << 31) | (T0 >> 1);
+    // src1 = T0;
+    tcg_gen_shli_tl(cpu_tmp0, cpu_tmp0, 31);
+    tcg_gen_shri_tl(cpu_cc_src, cpu_T[0], 1);
+    tcg_gen_or_tl(cpu_cc_src, cpu_cc_src, cpu_tmp0);
+
+    /* do addition and update flags */
+    tcg_gen_add_tl(cpu_T[0], cpu_cc_src, cpu_cc_src2);
+    tcg_gen_discard_tl(r_temp);
+
+    gen_cc_clear();
+    gen_cc_NZ(cpu_T[0]);
+    gen_cc_V_add(cpu_T[0], cpu_cc_src, cpu_cc_src2);
+    gen_cc_C_add(cpu_T[0], cpu_cc_src);
+}
+
 #ifdef TARGET_SPARC64
 static inline void gen_trap_ifdivzero_i64(TCGv divisor)
 {
@@ -4627,6 +4678,9 @@ CPUSPARCState *cpu_sparc_init(const char *cpu_model)
         cpu_cc_src = tcg_global_mem_new(TCG_TYPE_TL,
                                         TCG_AREG0, offsetof(CPUState, cc_src),
                                         "cc_src");
+        cpu_cc_src2 = tcg_global_mem_new(TCG_TYPE_TL, TCG_AREG0,
+                                         offsetof(CPUState, cc_src2),
+                                         "cc_src2");
         cpu_cc_dst = tcg_global_mem_new(TCG_TYPE_TL,
                                         TCG_AREG0, offsetof(CPUState, cc_dst),
                                         "cc_dst");
-- 
2.7.4