Attached, is an updated patch (with change logs).
The test cases are now in gcc.target/i386 and the
target selection is "dg-require-effective-target int128" only.
Verified that the tests correctly detect the presence/lack
of TImode support.
- Gary
Index: gcc/config/i386/i386.h
===================================================================
--- gcc/config/i386/i386.h (revision 190398)
+++ gcc/config/i386/i386.h (working copy)
@@ -1816,6 +1816,10 @@ do {
\
#define BRANCH_COST(speed_p, predictable_p) \
(!(speed_p) ? 2 : (predictable_p) ? 0 : ix86_branch_cost)
+/* An integer expression for the size in bits of the largest integer machine
+ mode that should actually be used. We allow pairs of registers. */
+#define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (TARGET_64BIT ? TImode : DImode)
+
/* Define this macro as a C expression which is nonzero if accessing
less than a word of memory (i.e. a `char' or a `short') is no
faster than accessing a word of memory, i.e., if such access
Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog (revision 190398)
+++ gcc/ChangeLog (working copy)
@@ -1,3 +1,10 @@
+2012-08-14 Gary Funck <g...@intrepid.com>
+
+ PR target/20020
+ * config/i386/i386.h (MAX_FIXED_MODE_SIZE): Allow use of TImode
+ for use with appropriately sized structures and unions
+ on 64-bit (x86) targets.
+
2012-08-14 Uros Bizjak <ubiz...@gmail.com>
* config/i386/i386.md (enabled): Add comment with explanation
Index: gcc/testsuite/gcc.target/i386/pr20020-1.c
===================================================================
--- gcc/testsuite/gcc.target/i386/pr20020-1.c (revision 0)
+++ gcc/testsuite/gcc.target/i386/pr20020-1.c (revision 0)
@@ -0,0 +1,23 @@
+/* Check that 128-bit struct's are represented as TImode values. */
+/* { dg-require-effective-target int128 } */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-rtl-expand" } */
+
+struct shared_ptr_struct
+{
+ unsigned long long phase:48;
+ unsigned short thread:16;
+ void *addr;
+};
+typedef struct shared_ptr_struct sptr_t;
+
+sptr_t S;
+
+sptr_t
+sptr_result (void)
+{
+ return S;
+}
+/* { dg-final { scan-rtl-dump "\\\(set \\\(reg:TI \[0-9\]* \\\[ <retval>
\\\]\\\)" "expand" } } */
+/* { dg-final { scan-rtl-dump "\\\(set \\\(reg/i:TI 0 ax\\\)" "expand" } } */
+/* { dg-final { cleanup-rtl-dump "expand" } } */
Index: gcc/testsuite/gcc.target/i386/pr20020-2.c
===================================================================
--- gcc/testsuite/gcc.target/i386/pr20020-2.c (revision 0)
+++ gcc/testsuite/gcc.target/i386/pr20020-2.c (revision 0)
@@ -0,0 +1,21 @@
+/* Check that 128-bit struct's are represented as TImode values. */
+/* { dg-require-effective-target int128 } */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-rtl-expand" } */
+
+struct shared_ptr_struct
+{
+ unsigned long long phase:48;
+ unsigned short thread:16;
+ void *addr;
+};
+typedef struct shared_ptr_struct sptr_t;
+
+void
+copy_sptr (sptr_t *dest, sptr_t src)
+{
+ *dest = src;
+}
+
+/* { dg-final { scan-rtl-dump "\\\(set \\\(reg:TI \[0-9\]*" "expand" } } */
+/* { dg-final { cleanup-rtl-dump "expand" } } */
Index: gcc/testsuite/gcc.target/i386/pr20020-3.c
===================================================================
--- gcc/testsuite/gcc.target/i386/pr20020-3.c (revision 0)
+++ gcc/testsuite/gcc.target/i386/pr20020-3.c (revision 0)
@@ -0,0 +1,24 @@
+/* Check that 128-bit struct's are represented as TImode values. */
+/* { dg-require-effective-target int128 } */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-rtl-expand" } */
+
+struct shared_ptr_struct
+{
+ unsigned long long phase:48;
+ unsigned short thread:16;
+ void *addr;
+};
+typedef struct shared_ptr_struct sptr_t;
+
+sptr_t sptr_1, sptr_2;
+
+void
+copy_sptr (void)
+{
+ sptr_1 = sptr_2;
+}
+
+/* { dg-final { scan-rtl-dump "\\\(set \\\(reg:TI \[0-9\]*" "expand" } } */
+/* { dg-final { scan-rtl-dump "\\\(set \\\(mem/c:TI" "expand" } } */
+/* { dg-final { cleanup-rtl-dump "expand" } } */
Index: gcc/testsuite/ChangeLog
===================================================================
--- gcc/testsuite/ChangeLog (revision 190398)
+++ gcc/testsuite/ChangeLog (working copy)
@@ -1,3 +1,10 @@
+2012-08-14 Gary Funck <g...@intrepid.com>
+
+ PR target/20020
+ * gcc.target/i386/pr20020-1.c: New.
+ * gcc.target/i386/pr20020-2.c: New.
+ * gcc.target/i386/pr20020-3.c: New.
+
2012-08-14 Oleg Endo <olege...@gcc.gnu.org>
PR target/52933
