[Qemu-devel] [RFC v7 02/16] softmmu: Simplify helper_*_st_name, wrap unaligned code

[Alvise Rigo <a.rigo@virtualopensystems.com>]

Attempting to simplify the helper_*_st_name, wrap the
do_unaligned_access code into an inline function.
Remove also the goto statement.

Based on this work, Alex proposed the following patch series
https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg01136.html
that reduces code duplication of the softmmu_helpers.

Suggested-by: Jani Kokkonen <jani.kokkonen@huawei.com>
Suggested-by: Claudio Fontana <claudio.fontana@huawei.com>
Signed-off-by: Alvise Rigo <a.rigo@virtualopensystems.com>
---
 softmmu_template.h | 96 ++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 60 insertions(+), 36 deletions(-)

diff --git a/softmmu_template.h b/softmmu_template.h
index 208f808..7029a03 100644
--- a/softmmu_template.h
+++ b/softmmu_template.h
@@ -370,6 +370,32 @@ static inline void glue(io_write, SUFFIX)(CPUArchState *env,
                                  iotlbentry->attrs);
 }
 
+static inline void glue(helper_le_st_name, _do_unl_access)(CPUArchState *env,
+                                                           DATA_TYPE val,
+                                                           target_ulong addr,
+                                                           TCGMemOpIdx oi,
+                                                           unsigned mmu_idx,
+                                                           uintptr_t retaddr)
+{
+    int i;
+
+    if ((get_memop(oi) & MO_AMASK) == MO_ALIGN) {
+        cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
+                             mmu_idx, retaddr);
+    }
+    /* XXX: not efficient, but simple */
+    /* Note: relies on the fact that tlb_fill() does not remove the
+     * previous page from the TLB cache.  */
+    for (i = DATA_SIZE - 1; i >= 0; i--) {
+        /* Little-endian extract.  */
+        uint8_t val8 = val >> (i * 8);
+        /* Note the adjustment at the beginning of the function.
+           Undo that for the recursion.  */
+        glue(helper_ret_stb, MMUSUFFIX)(env, addr + i, val8,
+                                        oi, retaddr + GETPC_ADJ);
+    }
+}
+
 void helper_le_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
                        TCGMemOpIdx oi, uintptr_t retaddr)
 {
@@ -399,7 +425,8 @@ void helper_le_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
     if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
         CPUIOTLBEntry *iotlbentry;
         if ((addr & (DATA_SIZE - 1)) != 0) {
-            goto do_unaligned_access;
+            glue(helper_le_st_name, _do_unl_access)(env, val, addr, mmu_idx,
+                                                    oi, retaddr);
         }
         iotlbentry = &env->iotlb[mmu_idx][index];
 
@@ -414,23 +441,8 @@ void helper_le_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
     if (DATA_SIZE > 1
         && unlikely((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1
                      >= TARGET_PAGE_SIZE)) {
-        int i;
-    do_unaligned_access:
-        if ((get_memop(oi) & MO_AMASK) == MO_ALIGN) {
-            cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
-                                 mmu_idx, retaddr);
-        }
-        /* XXX: not efficient, but simple */
-        /* Note: relies on the fact that tlb_fill() does not remove the
-         * previous page from the TLB cache.  */
-        for (i = DATA_SIZE - 1; i >= 0; i--) {
-            /* Little-endian extract.  */
-            uint8_t val8 = val >> (i * 8);
-            /* Note the adjustment at the beginning of the function.
-               Undo that for the recursion.  */
-            glue(helper_ret_stb, MMUSUFFIX)(env, addr + i, val8,
-                                            oi, retaddr + GETPC_ADJ);
-        }
+        glue(helper_le_st_name, _do_unl_access)(env, val, addr, mmu_idx,
+                                                oi, retaddr);
         return;
     }
 
@@ -450,6 +462,32 @@ void helper_le_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
 }
 
 #if DATA_SIZE > 1
+static inline void glue(helper_be_st_name, _do_unl_access)(CPUArchState *env,
+                                                           DATA_TYPE val,
+                                                           target_ulong addr,
+                                                           TCGMemOpIdx oi,
+                                                           unsigned mmu_idx,
+                                                           uintptr_t retaddr)
+{
+    int i;
+
+    if ((get_memop(oi) & MO_AMASK) == MO_ALIGN) {
+        cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
+                             mmu_idx, retaddr);
+    }
+    /* XXX: not efficient, but simple */
+    /* Note: relies on the fact that tlb_fill() does not remove the
+     * previous page from the TLB cache.  */
+    for (i = DATA_SIZE - 1; i >= 0; i--) {
+        /* Big-endian extract.  */
+        uint8_t val8 = val >> (((DATA_SIZE - 1) * 8) - (i * 8));
+        /* Note the adjustment at the beginning of the function.
+           Undo that for the recursion.  */
+        glue(helper_ret_stb, MMUSUFFIX)(env, addr + i, val8,
+                                        oi, retaddr + GETPC_ADJ);
+    }
+}
+
 void helper_be_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
                        TCGMemOpIdx oi, uintptr_t retaddr)
 {
@@ -479,7 +517,8 @@ void helper_be_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
     if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
         CPUIOTLBEntry *iotlbentry;
         if ((addr & (DATA_SIZE - 1)) != 0) {
-            goto do_unaligned_access;
+            glue(helper_be_st_name, _do_unl_access)(env, val, addr, mmu_idx,
+                                                    oi, retaddr);
         }
         iotlbentry = &env->iotlb[mmu_idx][index];
 
@@ -494,23 +533,8 @@ void helper_be_st_name(CPUArchState *env, target_ulong addr, DATA_TYPE val,
     if (DATA_SIZE > 1
         && unlikely((addr & ~TARGET_PAGE_MASK) + DATA_SIZE - 1
                      >= TARGET_PAGE_SIZE)) {
-        int i;
-    do_unaligned_access:
-        if ((get_memop(oi) & MO_AMASK) == MO_ALIGN) {
-            cpu_unaligned_access(ENV_GET_CPU(env), addr, MMU_DATA_STORE,
-                                 mmu_idx, retaddr);
-        }
-        /* XXX: not efficient, but simple */
-        /* Note: relies on the fact that tlb_fill() does not remove the
-         * previous page from the TLB cache.  */
-        for (i = DATA_SIZE - 1; i >= 0; i--) {
-            /* Big-endian extract.  */
-            uint8_t val8 = val >> (((DATA_SIZE - 1) * 8) - (i * 8));
-            /* Note the adjustment at the beginning of the function.
-               Undo that for the recursion.  */
-            glue(helper_ret_stb, MMUSUFFIX)(env, addr + i, val8,
-                                            oi, retaddr + GETPC_ADJ);
-        }
+            glue(helper_be_st_name, _do_unl_access)(env, val, addr, oi, mmu_idx,
+                                                    retaddr);
         return;
     }
 
-- 
2.7.0