SPARC NCG: Also do misaligned reads
[ghc.git] / rts / RtsAPI.c
index 9fa0e01..c5c5561 100644 (file)
@@ -292,6 +292,12 @@ rts_getInt32 (HaskellObj p)
   return (HsInt32)(HsInt)(UNTAG_CLOSURE(p)->payload[0]);
 }
 
+
+#ifdef sparc_HOST_ARCH
+/* The closures returned by allocateLocal are only guaranteed to be 32 bit
+   aligned, because that's the size of pointers. SPARC v9 can't do
+   misaligned loads/stores, so we have to read the 64bit word in chunks         */
+
 HsInt64
 rts_getInt64 (HaskellObj p)
 {
@@ -302,6 +308,25 @@ rts_getInt64 (HaskellObj p)
     tmp = (HsInt64*)&(UNTAG_CLOSURE(p)->payload[0]);
     return *tmp;
 }
+
+#else
+
+HsInt64
+rts_getInt64 (HaskellObj p)
+{
+    HsInt32* tmp;
+    // See comment above:
+    // ASSERT(p->header.info == I64zh_con_info ||
+    //        p->header.info == I64zh_static_info);
+    tmp = (HsInt32*)&(UNTAG_CLOSURE(p)->payload[0]);
+
+    HsInt64 i  = (HsInt64)(tmp[0] << 32) | (HsInt64)tmp[1];
+    return i
+}
+
+#endif /* sparc_HOST_ARCH */
+
+
 HsWord
 rts_getWord (HaskellObj p)
 {