[Qemu-devel] [PATCH] include/fpu/softfloat: Fix compilation with Clang on s390x

[Thomas Huth <thuth@redhat.com>]

Clang v7.0.1 does not like the __int128 variable type for inline
assembly on s390x:

In file included from fpu/softfloat.c:97:
include/fpu/softfloat-macros.h:647:9: error: inline asm error:
 This value type register class is not natively supported!
    asm("dlgr %0, %1" : "+r"(n) : "r"(d));
        ^

Disable this code part there now when compiling with Clang, so that
the generic code gets used instead.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 include/fpu/softfloat-macros.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/fpu/softfloat-macros.h b/include/fpu/softfloat-macros.h
index b1d772e..bd5b641 100644
--- a/include/fpu/softfloat-macros.h
+++ b/include/fpu/softfloat-macros.h
@@ -641,7 +641,7 @@ static inline uint64_t udiv_qrnnd(uint64_t *r, uint64_t n1,
     uint64_t q;
     asm("divq %4" : "=a"(q), "=d"(*r) : "0"(n0), "1"(n1), "rm"(d));
     return q;
-#elif defined(__s390x__)
+#elif defined(__s390x__) && !defined(__clang__)
     /* Need to use a TImode type to get an even register pair for DLGR.  */
     unsigned __int128 n = (unsigned __int128)n1 << 64 | n0;
     asm("dlgr %0, %1" : "+r"(n) : "r"(d));
-- 
1.8.3.1