[Qemu-devel] [PATCH 4/5] target-alpha: Implement cvtql inline.

[Richard Henderson <rth@twiddle.net>]

It's a simple mask and shift sequence.
Also, fix a typo in the actual masks used.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-alpha/helper.h    |    4 ----
 target-alpha/op_helper.c |   20 --------------------
 target-alpha/translate.c |   45 +++++++++++++++++++++++++++++++++++++++------
 3 files changed, 39 insertions(+), 30 deletions(-)

diff --git a/target-alpha/helper.h b/target-alpha/helper.h
index c378195..10c78d0 100644
--- a/target-alpha/helper.h
+++ b/target-alpha/helper.h
@@ -89,10 +89,6 @@ DEF_HELPER_FLAGS_1(cvttq, TCG_CALL_CONST, i64, i64)
 DEF_HELPER_FLAGS_1(cvttq_c, TCG_CALL_CONST, i64, i64)
 DEF_HELPER_FLAGS_1(cvttq_svic, TCG_CALL_CONST, i64, i64)
 
-DEF_HELPER_FLAGS_1(cvtql, TCG_CALL_CONST | TCG_CALL_PURE, i64, i64)
-DEF_HELPER_1(cvtql_v, i64, i64)
-DEF_HELPER_1(cvtql_sv, i64, i64)
-
 DEF_HELPER_FLAGS_1(setroundmode, TCG_CALL_CONST, void, i32)
 DEF_HELPER_FLAGS_1(setflushzero, TCG_CALL_CONST, void, i32)
 DEF_HELPER_FLAGS_0(fp_exc_clear, TCG_CALL_CONST, void)
diff --git a/target-alpha/op_helper.c b/target-alpha/op_helper.c
index 84867b8..f9cd07a 100644
--- a/target-alpha/op_helper.c
+++ b/target-alpha/op_helper.c
@@ -1159,26 +1159,6 @@ uint64_t helper_cvtlq (uint64_t a)
     return (lo & 0x3FFFFFFF) | (hi & 0xc0000000);
 }
 
-uint64_t helper_cvtql (uint64_t a)
-{
-    return ((a & 0xC0000000) << 32) | ((a & 0x7FFFFFFF) << 29);
-}
-
-uint64_t helper_cvtql_v (uint64_t a)
-{
-    if ((int32_t)a != (int64_t)a)
-        helper_excp(EXCP_ARITH, EXC_M_IOV);
-    return helper_cvtql(a);
-}
-
-uint64_t helper_cvtql_sv (uint64_t a)
-{
-    /* ??? I'm pretty sure there's nothing that /sv needs to do that /v
-       doesn't do.  The only thing I can think is that /sv is a valid
-       instruction merely for completeness in the ISA.  */
-    return helper_cvtql_v(a);
-}
-
 /* PALcode support special instructions */
 #if !defined (CONFIG_USER_ONLY)
 void helper_hw_rei (void)
diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index 188e76c..cfdf441 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -597,6 +597,41 @@ static inline void gen_fp_exc_raise(int rc, int fn11)
     gen_fp_exc_raise_ignore(rc, fn11, fn11 & QUAL_I ? 0 : float_flag_inexact);
 }
 
+static void gen_fcvtql(int rb, int rc)
+{
+    if (unlikely(rc == 31)) {
+        return;
+    }
+    if (unlikely(rb == 31)) {
+        tcg_gen_movi_i64(cpu_fir[rc], 0);
+    } else {
+        TCGv tmp = tcg_temp_new();
+
+        tcg_gen_andi_i64(tmp, cpu_fir[rb], 0xC0000000);
+        tcg_gen_andi_i64(cpu_fir[rc], cpu_fir[rb], 0x3FFFFFFF);
+        tcg_gen_shli_i64(tmp, tmp, 32);
+        tcg_gen_shli_i64(cpu_fir[rc], cpu_fir[rc], 29);
+        tcg_gen_or_i64(cpu_fir[rc], cpu_fir[rc], tmp);
+
+        tcg_temp_free(tmp);
+    }
+}
+
+static void gen_fcvtql_v(DisasContext *ctx, int rb, int rc)
+{
+    if (rb != 31) {
+        int lab = gen_new_label();
+        TCGv tmp = tcg_temp_new();
+
+        tcg_gen_ext_i32_i64(tmp, cpu_fir[rb]);
+        tcg_gen_brcond_i64(TCG_COND_EQ, tmp, cpu_fir[rb], lab);
+        gen_excp(ctx, EXCP_ARITH, EXC_M_IOV);
+
+        gen_set_label(lab);
+    }
+    gen_fcvtql(rb, rc);
+}
+
 #define FARITH2(name)                                   \
 static inline void glue(gen_f, name)(int rb, int rc)    \
 {                                                       \
@@ -612,9 +647,6 @@ static inline void glue(gen_f, name)(int rb, int rc)    \
     }                                                   \
 }
 FARITH2(cvtlq)
-FARITH2(cvtql)
-FARITH2(cvtql_v)
-FARITH2(cvtql_sv)
 
 /* ??? VAX instruction qualifiers ignored.  */
 FARITH2(sqrtf)
@@ -2327,11 +2359,12 @@ static inline int translate_one(DisasContext *ctx, uint32_t insn)
             break;
         case 0x130:
             /* CVTQL/V */
-            gen_fcvtql_v(rb, rc);
-            break;
         case 0x530:
             /* CVTQL/SV */
-            gen_fcvtql_sv(rb, rc);
+            /* ??? I'm pretty sure there's nothing that /sv needs to do that
+               /v doesn't do.  The only thing I can think is that /sv is a
+               valid instruction merely for completeness in the ISA.  */
+            gen_fcvtql_v(ctx, rb, rc);
             break;
         default:
             goto invalid_opc;
-- 
1.6.6.1