[PATCH v3 0/2] MR7237: include: Fix ReadNoFence64 on i386.

[Jinoh Kang (＠iamahuman)]

64-bit volatile accesses are not atomic on i386.  Both
i686-w64-mingw32-gcc and x86 MSVC splits 64-bit loads into a pair of
load/store ops.

Fix this by using a FILD/FISTP pair, which is also used to implement C11
atomics by i686-w64-mingw32-gcc.

Fixes: f82b1c1fcf770a5d6fa02c3f286282be79a201b8

--
  v3: include: Prevent misuse of __WINE_ATOMIC_* helper macros for non-atomic large accesses.
      include: Fix ReadNoFence64 on i386.

https://gitlab.winehq.org/wine/wine/-/merge_requests/7237

[PATCH v3 1/2] include: Fix ReadNoFence64 on i386.

[Jinoh Kang]

From: Jinoh Kang

64-bit volatile accesses are not atomic on i386.  Both
i686-w64-mingw32-gcc and x86 MSVC splits 64-bit loads into a pair of
load/store ops.

Fix this by using a FILD/FISTP pair, which is also used to implement C11
atomics by i686-w64-mingw32-gcc.

Fixes: f82b1c1fcf770a5d6fa02c3f286282be79a201b8
---
 include/winnt.h | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/include/winnt.h b/include/winnt.h
index 2547f841b7c..f93c27bb4a4 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -7122,7 +7122,15 @@ static FORCEINLINE LONG ReadNoFence( LONG const volatile *src )

static FORCEINLINE LONG64 ReadNoFence64( LONG64 const volatile *src )
 {
-    LONG64 value = __WINE_LOAD64_NO_FENCE( (__int64 const volatile *)src );
+    LONG64 value;
+#if defined(__i386__) && _MSC_VER < 1700
+    __asm {
+        fild qword ptr [src]
+        fistp qword ptr [value]
+    }
+#else
+    value = __WINE_LOAD64_NO_FENCE( (__int64 const volatile *)src );
+#endif
     return value;
 }

@@ -7315,7 +7323,11 @@ static FORCEINLINE LONG ReadNoFence( LONG const volatile *src )
 static FORCEINLINE LONG64 ReadNoFence64( LONG64 const volatile *src )
 {
     LONG64 value;
+#ifdef __i386__
+    __asm__ __volatile__( "fildq %1\n\tfistpq %0" : "=m" (value) : "m" (src) : "memory", "st" );
+#else
     __WINE_ATOMIC_LOAD_RELAXED( src, &value );
+#endif
     return value;
 }

[PATCH v3 2/2] include: Prevent misuse of __WINE_ATOMIC_* helper macros for non-atomic large accesses.

[Jinoh Kang]

From: Jinoh Kang

---
 include/winnt.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/winnt.h b/include/winnt.h
index f93c27bb4a4..2057c4999d3 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -7295,10 +7295,10 @@ static FORCEINLINE void MemoryBarrier(void)

#if defined(__x86_64__) || defined(__i386__)
 /* On x86, Support old GCC with either no or buggy (GCC BZ#81316) __atomic_* support */
-#define __WINE_ATOMIC_LOAD_ACQUIRE(ptr, ret) do { *(ret) = *(ptr); __asm__ __volatile__( "" ::: "memory" ); } while (0)
-#define __WINE_ATOMIC_LOAD_RELAXED(ptr, ret) do { *(ret) = *(ptr); } while (0)
-#define __WINE_ATOMIC_STORE_RELEASE(ptr, val) do { __asm__ __volatile__( "" ::: "memory" ); *(ptr) = *(val); } while (0)
-#define __WINE_ATOMIC_STORE_RELAXED(ptr, val) do { *(ptr) = *(val); } while (0)
+#define __WINE_ATOMIC_LOAD_ACQUIRE(ptr, ret) do { C_ASSERT(sizeof(*(ptr)) <= sizeof(void *)); *(ret) = *(ptr); __asm__ __volatile__( "" ::: "memory" ); } while (0)
+#define __WINE_ATOMIC_LOAD_RELAXED(ptr, ret) do { C_ASSERT(sizeof(*(ptr)) <= sizeof(void *)); *(ret) = *(ptr); } while (0)
+#define __WINE_ATOMIC_STORE_RELEASE(ptr, val) do { C_ASSERT(sizeof(*(ptr)) <= sizeof(void *)); __asm__ __volatile__( "" ::: "memory" ); *(ptr) = *(val); } while (0)
+#define __WINE_ATOMIC_STORE_RELAXED(ptr, val) do { C_ASSERT(sizeof(*(ptr)) <= sizeof(void *)); *(ptr) = *(val); } while (0)
 #else
 #define __WINE_ATOMIC_LOAD_ACQUIRE(ptr, ret) __atomic_load(ptr, ret, __ATOMIC_ACQUIRE)
 #define __WINE_ATOMIC_LOAD_RELAXED(ptr, ret) __atomic_load(ptr, ret, __ATOMIC_RELAXED)

[PATCH v3 2/2] include: Prevent misuse of __WINE_ATOMIC_* helper macros for non-atomic large accesses.

[Marvin]

Hi,

It looks like your patch introduced the new failures shown below.
Please investigate and fix them before resubmitting your patch.
If they are not new, fixing them anyway would help a lot. Otherwise
please ask for the known failures list to be updated.

The full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=151178

Your paranoid android.

=== debian11 (build log) ===

../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
Task: The win32 Wine build failed

=== debian11b (build log) ===

../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
../wine/include/winnt.h:405:21: error: static assertion failed: "sizeof(*(&__obj->seq)) <= sizeof(void *)"
Task: The wow32 Wine build failed

[Jinoh Kang (＠iamahuman)]

v2: Fix instruction (thanks @Alcaro)
v3: Reword commit message a bit