diff mbox series

[4/7] target/s390x: Tidy access_prepare_nf

Message ID 20230109201856.3916639-5-richard.henderson@linaro.org
State Superseded
Headers show
Series target/s390x: mem_helper.c cleanups | expand

Commit Message

Richard Henderson Jan. 9, 2023, 8:18 p.m. UTC 
Assign to access struct immediately, rather than waiting
until the end of the function.  This means we can pass
address of haddr struct members instead of allocating
extra space on the local stack.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/s390x/tcg/mem_helper.c | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

Comments

David Hildenbrand Jan. 11, 2023, 10:15 a.m. UTC | #1 
On 09.01.23 21:18, Richard Henderson wrote:
> Assign to access struct immediately, rather than waiting
> until the end of the function.  This means we can pass
> address of haddr struct members instead of allocating
> extra space on the local stack.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: David Hildenbrand <david@redhat.com>
diff mbox series

Patch

diff --git a/target/s390x/tcg/mem_helper.c b/target/s390x/tcg/mem_helper.c
index 0f2830f87c..59237fe7de 100644
--- a/target/s390x/tcg/mem_helper.c
+++ b/target/s390x/tcg/mem_helper.c
@@ -176,39 +176,35 @@  static int access_prepare_nf(S390Access *access, CPUS390XState *env,
                              MMUAccessType access_type,
                              int mmu_idx, uintptr_t ra)
 {
-    void *haddr1, *haddr2 = NULL;
     int size1, size2, exc;
-    vaddr vaddr2 = 0;
 
     assert(size > 0 && size <= 4096);
 
     size1 = MIN(size, -(vaddr1 | TARGET_PAGE_MASK)),
     size2 = size - size1;
 
+    memset(access, 0, sizeof(*access));
+    access->vaddr1 = vaddr1;
+    access->size1 = size1;
+    access->size2 = size2;
+    access->mmu_idx = mmu_idx;
+
     exc = s390_probe_access(env, vaddr1, size1, access_type, mmu_idx, nonfault,
-                            &haddr1, ra);
-    if (exc) {
+                            &access->haddr1, ra);
+    if (unlikely(exc)) {
         return exc;
     }
     if (unlikely(size2)) {
         /* The access crosses page boundaries. */
-        vaddr2 = wrap_address(env, vaddr1 + size1);
+        vaddr vaddr2 = wrap_address(env, vaddr1 + size1);
+
+        access->vaddr2 = vaddr2;
         exc = s390_probe_access(env, vaddr2, size2, access_type, mmu_idx,
-                                nonfault, &haddr2, ra);
-        if (exc) {
+                                nonfault, &access->haddr2, ra);
+        if (unlikely(exc)) {
             return exc;
         }
     }
-
-    *access = (S390Access) {
-        .vaddr1 = vaddr1,
-        .vaddr2 = vaddr2,
-        .haddr1 = haddr1,
-        .haddr2 = haddr2,
-        .size1 = size1,
-        .size2 = size2,
-        .mmu_idx = mmu_idx
-    };
     return 0;
 }