tcg: Add temp allocation for TCGv_i128

This enables allocation of i128.  The type is not yet
usable, as we have not yet added data movement ops.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/tcg/tcg.h

@@ -687,6 +687,11 @@ static inline TCGTemp *tcgv_i64_temp(TCGv_i64 v)
     return tcgv_i32_temp((TCGv_i32)v);
 }
 
+static inline TCGTemp *tcgv_i128_temp(TCGv_i128 v)
+{
+    return tcgv_i32_temp((TCGv_i32)v);
+}
+
 static inline TCGTemp *tcgv_ptr_temp(TCGv_ptr v)
 {
     return tcgv_i32_temp((TCGv_i32)v);
@@ -707,6 +712,11 @@ static inline TCGArg tcgv_i64_arg(TCGv_i64 v)
     return temp_arg(tcgv_i64_temp(v));
 }
 
+static inline TCGArg tcgv_i128_arg(TCGv_i128 v)
+{
+    return temp_arg(tcgv_i128_temp(v));
+}
+
 static inline TCGArg tcgv_ptr_arg(TCGv_ptr v)
 {
     return temp_arg(tcgv_ptr_temp(v));
@@ -728,6 +738,11 @@ static inline TCGv_i64 temp_tcgv_i64(TCGTemp *t)
     return (TCGv_i64)temp_tcgv_i32(t);
 }
 
+static inline TCGv_i128 temp_tcgv_i128(TCGTemp *t)
+{
+    return (TCGv_i128)temp_tcgv_i32(t);
+}
+
 static inline TCGv_ptr temp_tcgv_ptr(TCGTemp *t)
 {
     return (TCGv_ptr)temp_tcgv_i32(t);
@@ -853,6 +868,11 @@ static inline void tcg_temp_free_i64(TCGv_i64 arg)
     tcg_temp_free_internal(tcgv_i64_temp(arg));
 }
 
+static inline void tcg_temp_free_i128(TCGv_i128 arg)
+{
+    tcg_temp_free_internal(tcgv_i128_temp(arg));
+}
+
 static inline void tcg_temp_free_ptr(TCGv_ptr arg)
 {
     tcg_temp_free_internal(tcgv_ptr_temp(arg));
@@ -901,6 +921,18 @@ static inline TCGv_i64 tcg_temp_local_new_i64(void)
     return temp_tcgv_i64(t);
 }
 
+static inline TCGv_i128 tcg_temp_new_i128(void)
+{
+    TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I128, false);
+    return temp_tcgv_i128(t);
+}
+
+static inline TCGv_i128 tcg_temp_local_new_i128(void)
+{
+    TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I128, true);
+    return temp_tcgv_i128(t);
+}
+
 static inline TCGv_ptr tcg_global_mem_new_ptr(TCGv_ptr reg, intptr_t offset,
                                               const char *name)
 {

tcg/tcg.c

@@ -1273,26 +1273,45 @@ TCGTemp *tcg_temp_new_internal(TCGType type, bool temp_local)
         tcg_debug_assert(ts->base_type == type);
         tcg_debug_assert(ts->kind == kind);
     } else {
+        int i, n;
+
+        switch (type) {
+        case TCG_TYPE_I32:
+        case TCG_TYPE_V64:
+        case TCG_TYPE_V128:
+        case TCG_TYPE_V256:
+            n = 1;
+            break;
+        case TCG_TYPE_I64:
+            n = 64 / TCG_TARGET_REG_BITS;
+            break;
+        case TCG_TYPE_I128:
+            n = 128 / TCG_TARGET_REG_BITS;
+            break;
+        default:
+            g_assert_not_reached();
+        }
+
         ts = tcg_temp_alloc(s);
-        if (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64) {
+        ts->base_type = type;
+        ts->temp_allocated = 1;
+        ts->kind = kind;
+
+        if (n == 1) {
+            ts->type = type;
+        } else {
+            ts->type = TCG_TYPE_REG;
+
+            for (i = 1; i < n; ++i) {
                 TCGTemp *ts2 = tcg_temp_alloc(s);
 
-            ts->base_type = type;
+                tcg_debug_assert(ts2 == ts + i);
-            ts->type = TCG_TYPE_I32;
+                ts2->base_type = type;
-            ts->temp_allocated = 1;
+                ts2->type = TCG_TYPE_REG;
-            ts->kind = kind;
-
-            tcg_debug_assert(ts2 == ts + 1);
-            ts2->base_type = TCG_TYPE_I64;
-            ts2->type = TCG_TYPE_I32;
                 ts2->temp_allocated = 1;
-            ts2->temp_subindex = 1;
+                ts2->temp_subindex = i;
                 ts2->kind = kind;
-        } else {
+            }
-            ts->base_type = type;
-            ts->type = type;
-            ts->temp_allocated = 1;
-            ts->kind = kind;
         }
     }
 
@@ -3384,9 +3403,14 @@ static void temp_allocate_frame(TCGContext *s, TCGTemp *ts)
     case TCG_TYPE_V64:
         align = 8;
         break;
+    case TCG_TYPE_I128:
     case TCG_TYPE_V128:
     case TCG_TYPE_V256:
-        /* Note that we do not require aligned storage for V256. */
+        /*
+         * Note that we do not require aligned storage for V256,
+         * and that we provide alignment for I128 to match V128,
+         * even if that's above what the host ABI requires.
+         */
         align = 16;
         break;
     default: