PR middle-end/31309

	* expr.c (copy_blkmode_from_reg): Use a mode suited to the size when
	copying to memory.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@131472 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 93 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/struct-ret-3.c b/gcc/testsuite/gcc.dg/struct-ret-3.c
new file mode 100644
index 00000000000..0b47d40768b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/struct-ret-3.c
@@ -0,0 +1,93 @@
+/* PR middle-end/31309 */
+/* Origin: Peeter Joot <peeterj@ca.ibm.com> */
+
+/* { dg-do run { target *-*-linux* } } */
+
+#include <sys/mman.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+unsigned long ossAlignX(unsigned long i, unsigned long X)
+{
+   return ((i + (X - 1)) & ~(unsigned long) (X - 1));
+}
+
+struct STRUCT_6_BYTES
+{
+   unsigned char slot[sizeof(unsigned short)];
+   unsigned char page[sizeof(unsigned int)];
+};
+
+struct SQLU_DICT_INFO_0
+{
+   void *pBlah;
+   char bSomeFlag1;
+   char bSomeFlag2;
+   struct STRUCT_6_BYTES dRID;
+};
+
+struct SQLU_DATAPART_0
+{
+   struct SQLU_DICT_INFO_0 *pDictRidderInfo;
+};
+
+struct XXX
+{
+   struct SQLU_DATAPART_0 *m_pDatapart;
+};
+
+struct STRUCT_6_BYTES INIT_6_BYTES_ZERO()
+{
+   struct STRUCT_6_BYTES ridOut = {{0,0}, {0,0,0,0}};
+   return ridOut;
+}
+
+void Initialize(struct XXX *this, int iIndex)
+{
+   struct SQLU_DICT_INFO_0 *pDictRidderInfo = this->m_pDatapart[iIndex].pDictRidderInfo;
+   pDictRidderInfo->bSomeFlag1 = 0;
+   pDictRidderInfo->bSomeFlag2 = 0;
+   pDictRidderInfo->dRID = INIT_6_BYTES_ZERO();
+}
+
+int main(void)
+{
+   int rc;
+
+   struct stuff
+   {
+      char c0[4096-sizeof(struct XXX)];
+      struct XXX o;
+      char c1[4096*2-sizeof(struct SQLU_DATAPART_0)];
+      struct SQLU_DATAPART_0 dp;
+      char c2[4096*2-sizeof(struct SQLU_DICT_INFO_0)];
+      struct SQLU_DICT_INFO_0 di;
+      char c3[4096];
+   };
+
+   char buf[sizeof(struct stuff)+4096];
+   struct stuff *u = (struct stuff *)ossAlignX((unsigned long)&buf[0], 4096);
+   memset(u, 1, sizeof(u));
+   u->c1[0] = '\xAA';
+   u->c2[0] = '\xBB';
+   u->c3[0] = '\xCC';
+
+   rc = mprotect(u->c1, 4096, PROT_NONE);
+   if (rc == -1)
+      printf("mprotect:c1: %d: %d(%s)\n", rc, errno, strerror(errno));
+
+   rc = mprotect(u->c2, 4096, PROT_NONE);
+   if (rc == -1)
+      printf("mprotect:c2: %d: %d(%s)\n", rc, errno, strerror(errno));
+
+   rc = mprotect(u->c3, 4096, PROT_NONE);
+   if (rc == -1)
+      printf("mprotect:c3: %d: %d(%s)\n", rc, errno, strerror(errno));
+
+   u->o.m_pDatapart = &u->dp;
+   u->dp.pDictRidderInfo = &u->di;
+   Initialize(&u->o, 0);
+
+   return 0;
+}