2013-02-07 Vladimir Makarov <vmakarov@redhat.com>

	PR rtl-optimization/56225
	* lra-constraints.c (process_alt_operands): Check that reload hard
	reg can hold value for strict_low_part.

2013-02-07  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/56225
	* gcc.target/i386/pr56225.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@195856 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a1ad361..c8551dc 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2013-02-07  Vladimir Makarov  <vmakarov@redhat.com>
+
+       PR rtl-optimization/56225
+       * lra-constraints.c (process_alt_operands): Check that reload hard
+       reg can hold value for strict_low_part.
+
 2013-02-07  Jakub Jelinek  <jakub@redhat.com>
 
        PR debug/56154

diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c
index cc28854..932b699 100644 (file)
--- a/gcc/lra-constraints.c
+++ b/gcc/lra-constraints.c
@@ -1895,7 +1895,22 @@ process_alt_operands (int only_alternative)
                        ? in_hard_reg_set_p (this_alternative_set,
                                             mode, hard_regno[nop])
                        : in_class_p (op, this_alternative, NULL))))
-               losers++;
+               {
+                 /* Strict_low_part requires reload the register not
+                    the sub-register.  In this case we should check
+                    that a final reload hard reg can hold the
+                    value.  */
+                 if (curr_static_id->operand[nop].strict_low
+                     && REG_P (op)
+                     && hard_regno[nop] < 0
+                     && GET_CODE (*curr_id->operand_loc[nop]) == SUBREG
+                     && ira_class_hard_regs_num[this_alternative] > 0
+                     && ! HARD_REGNO_MODE_OK (ira_class_hard_regs
+                                              [this_alternative][0],
+                                              GET_MODE (op)))
+                   goto fail;
+                 losers++;
+               }
              if (operand_reg[nop] != NULL_RTX
                  /* Output operands and matched input operands are
                     not inherited.  The following conditions do not

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c024e08..95b4bf6 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2013-02-07  Vladimir Makarov  <vmakarov@redhat.com>
+
+       PR rtl-optimization/56225
+       * gcc.target/i386/pr56225.c: New test.
+
 2013-02-07  Jakub Jelinek  <jakub@redhat.com>
 
        PR debug/56154

diff --git a/gcc/testsuite/gcc.target/i386/pr56225.c b/gcc/testsuite/gcc.target/i386/pr56225.c
new file mode 100644 (file)
index 0000000..638c0ce
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr56225.c
@@ -0,0 +1,12 @@
+/* PR target/56225 */
+/* { dg-do compile { target { ia32 } } } */
+/* { dg-options "-O2 -march=pentium3 -mtune=generic" } */
+
+void bar (int);
+
+void
+foo (int x, int y)
+{
+  __attribute__ ((vector_size (8 * sizeof (short)))) short s0 = { x };
+  bar ((short) (long) &s0 + y);
+}