[Qemu-devel] [PATCH 3/5] target-arm: convert shl and shr helpers to TCG

[Aurelien Jarno]

Now that the setcond TCG op is available, it's possible to replace
shl and shr helpers by TCG code. The code generated by TCG is slightly
longer than the code generated by GCC for the helper but is still worth
it as this avoid all the consequences of using an helper: globals saved
back to memory, no possible optimization, call overhead, etc.

Cc: Peter Maydell <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>
---
 target-arm/helper.h    |    2 --
 target-arm/op_helper.c |   16 ----------------
 target-arm/translate.c |   32 ++++++++++++++++++++++++++++----
 3 files changed, 28 insertions(+), 22 deletions(-)

diff --git a/target-arm/helper.h b/target-arm/helper.h
index 7151e28..b123d3e 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -145,8 +145,6 @@ DEF_HELPER_5(neon_tbl, i32, env, i32, i32, i32, i32)
 DEF_HELPER_3(adc_cc, i32, env, i32, i32)
 DEF_HELPER_3(sbc_cc, i32, env, i32, i32)
 
-DEF_HELPER_3(shl, i32, env, i32, i32)
-DEF_HELPER_3(shr, i32, env, i32, i32)
 DEF_HELPER_3(sar, i32, env, i32, i32)
 DEF_HELPER_3(shl_cc, i32, env, i32, i32)
 DEF_HELPER_3(shr_cc, i32, env, i32, i32)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 6095f24..5fcd12c 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -355,22 +355,6 @@ uint32_t HELPER(sbc_cc)(CPUARMState *env, uint32_t a, 
uint32_t b)
 
 /* Similarly for variable shift instructions.  */
 
-uint32_t HELPER(shl)(CPUARMState *env, uint32_t x, uint32_t i)
-{
-    int shift = i & 0xff;
-    if (shift >= 32)
-        return 0;
-    return x << shift;
-}
-
-uint32_t HELPER(shr)(CPUARMState *env, uint32_t x, uint32_t i)
-{
-    int shift = i & 0xff;
-    if (shift >= 32)
-        return 0;
-    return (uint32_t)x >> shift;
-}
-
 uint32_t HELPER(sar)(CPUARMState *env, uint32_t x, uint32_t i)
 {
     int shift = i & 0xff;
diff --git a/target-arm/translate.c b/target-arm/translate.c
index 19bb1e8..9c29065 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -440,6 +440,26 @@ static void gen_sub_CC(TCGv dest, TCGv t0, TCGv t1)
     tcg_gen_mov_i32(dest, cpu_NF);
 }
 
+#define GEN_SHIFT(name)                                \
+static void gen_##name(TCGv dest, TCGv t0, TCGv t1)    \
+{                                                      \
+    TCGv tmp1, tmp2;                                   \
+    tmp1 = tcg_temp_new_i32();                         \
+    tcg_gen_andi_i32(tmp1, t1, 0xff);                  \
+    tmp2 = tcg_temp_new_i32();                         \
+    tcg_gen_setcondi_i32(TCG_COND_GE, tmp2, tmp1, 32); \
+    tcg_gen_andi_i32(tmp1, tmp1, 0x1f);                \
+    tcg_gen_##name##_i32(dest, t0, tmp1);              \
+    tcg_temp_free_i32(tmp1);                           \
+    tcg_gen_subi_i32(tmp2, tmp2, 1);                   \
+    tcg_gen_and_i32(dest, dest, tmp2);                 \
+    tcg_temp_free_i32(tmp2);                           \
+}
+GEN_SHIFT(shl)
+GEN_SHIFT(shr)
+#undef GEN_SHIFT
+
+
 /* FIXME:  Implement this natively.  */
 #define tcg_gen_abs_i32(t0, t1) gen_helper_abs(t0, t1)
 
@@ -516,8 +536,12 @@ static inline void gen_arm_shift_reg(TCGv var, int shiftop,
         }
     } else {
         switch (shiftop) {
-        case 0: gen_helper_shl(var, cpu_env, var, shift); break;
-        case 1: gen_helper_shr(var, cpu_env, var, shift); break;
+        case 0:
+            gen_shl(var, var, shift);
+            break;
+        case 1:
+            gen_shr(var, var, shift);
+            break;
         case 2: gen_helper_sar(var, cpu_env, var, shift); break;
         case 3: tcg_gen_andi_i32(shift, shift, 0x1f);
                 tcg_gen_rotr_i32(var, var, shift); break;
@@ -9161,7 +9185,7 @@ static void disas_thumb_insn(CPUARMState *env, 
DisasContext *s)
             break;
         case 0x2: /* lsl */
             if (s->condexec_mask) {
-                gen_helper_shl(tmp2, cpu_env, tmp2, tmp);
+                gen_shl(tmp2, tmp2, tmp);
             } else {
                 gen_helper_shl_cc(tmp2, cpu_env, tmp2, tmp);
                 gen_logic_CC(tmp2);
@@ -9169,7 +9193,7 @@ static void disas_thumb_insn(CPUARMState *env, 
DisasContext *s)
             break;
         case 0x3: /* lsr */
             if (s->condexec_mask) {
-                gen_helper_shr(tmp2, cpu_env, tmp2, tmp);
+                gen_shr(tmp2, tmp2, tmp);
             } else {
                 gen_helper_shr_cc(tmp2, cpu_env, tmp2, tmp);
                 gen_logic_CC(tmp2);
-- 
1.7.10.4