The following patch fixes
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56225
The patch was successfully bootstrapped and tested on x86/x86-64.
Committed as rev. 195856.
2013-02-07 Vladimir Makarov <[email protected]>
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 <[email protected]>
PR rtl-optimization/56225
* gcc.target/i386/pr56225.c: New test.
Index: lra-constraints.c
===================================================================
--- lra-constraints.c (revision 195807)
+++ lra-constraints.c (working copy)
@@ -1895,7 +1895,22 @@ process_alt_operands (int only_alternati
? 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
Index: testsuite/gcc.target/i386/pr56225.c
===================================================================
--- testsuite/gcc.target/i386/pr56225.c (revision 0)
+++ testsuite/gcc.target/i386/pr56225.c (working copy)
@@ -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);
+}
