===================================================================
@@ -1220,8 +1220,17 @@ assign_by_spills (void)
bitmap_initialize (&failed_reload_insns, ®_obstack);
for (i = 0; i < nfails; i++)
- bitmap_ior_into (&failed_reload_insns,
- &lra_reg_info[sorted_pseudos[i]].insn_bitmap);
+ {
+ regno = sorted_pseudos[i];
+ bitmap_ior_into (&failed_reload_insns,
+ &lra_reg_info[regno].insn_bitmap);
+ /* Assign an arbitrary hard register of regno class to
+ avoid further trouble with the asm insns. */
+ bitmap_clear_bit (&all_spilled_pseudos, regno);
+ assign_hard_regno
+ (ira_class_hard_regs[regno_allocno_class_array[regno]][0],
+ regno);
+ }
EXECUTE_IF_SET_IN_BITMAP (&failed_reload_insns, 0, u, bi)
{
insn = lra_insn_recog_data[u]->insn;
@@ -1230,9 +1239,6 @@ assign_by_spills (void)
asm_p = true;
error_for_asm (insn,
"%<asm%> operand has impossible constraints");
- /* Avoid further trouble with this insn. */
- PATTERN (insn) = gen_rtx_USE (VOIDmode, const0_rtx);
- lra_invalidate_insn_data (insn);
}
}
lra_assert (asm_p);
===================================================================
@@ -3184,7 +3184,7 @@ loc_equivalence_change_p (rtx *loc)
/* Maximum allowed number of constraint pass iterations after the last
spill pass. It is for preventing LRA cycling in a bug case. */
-#define MAX_CONSTRAINT_ITERATION_NUMBER 15
+#define MAX_CONSTRAINT_ITERATION_NUMBER 30
/* Maximum number of generated reload insns per an insn. It is for
preventing this pass cycling in a bug case. */
===================================================================
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+int
+foo (int x)
+{
+ asm goto ("" : : "r" (x), "r" (x + 1), "r" (x + 2), "r" (x + 3), /* { dg-error "operand has impossible constraints" } */
+ "r" (x + 4), "r" (x + 5), "r" (x + 6), "r" (x + 7),
+ "r" (x + 8), "r" (x + 9), "r" (x + 10), "r" (x + 11),
+ "r" (x + 12), "r" (x + 13), "r" (x + 14), "r" (x + 15) : : lab);
+ __builtin_unreachable ();
+ lab:
+ return 0;
+}
===================================================================
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+#define __builtin_unreachable() do { } while (0)
+
+int
+foo (int x)
+{
+ asm goto ("" : : "r" (x), "r" (x + 1), "r" (x + 2), "r" (x + 3), /* { dg-error "operand has impossible constraints" } */
+ "r" (x + 4), "r" (x + 5), "r" (x + 6), "r" (x + 7),
+ "r" (x + 8), "r" (x + 9), "r" (x + 10), "r" (x + 11),
+ "r" (x + 12), "r" (x + 13), "r" (x + 14), "r" (x + 15) : : lab);
+ __builtin_unreachable ();
+ lab:
+ return 0;
+}
===================================================================
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+int
+bar (int x)
+{
+ asm goto ("" : : "r" (x), "r" (x + 1), "r" (x + 2), "r" (x + 3), /* { dg-error "operand has impossible constraints" } */
+ "r" (x + 4), "r" (x + 5), "r" (x + 6), "r" (x + 7),
+ "r" (x + 8), "r" (x + 9), "r" (x + 10), "r" (x + 11),
+ "r" (x + 12), "r" (x + 13), "r" (x + 14), "r" (x + 15),
+ "r" (x + 16) : : lab);
+ __builtin_unreachable ();
+ lab:
+ return 0;
+}
===================================================================
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+#define __builtin_unreachable() do { } while (0)
+
+int
+bar (int x)
+{
+ asm goto ("" : : "r" (x), "r" (x + 1), "r" (x + 2), "r" (x + 3), /* { dg-error "operand has impossible constraints" } */
+ "r" (x + 4), "r" (x + 5), "r" (x + 6), "r" (x + 7),
+ "r" (x + 8), "r" (x + 9), "r" (x + 10), "r" (x + 11),
+ "r" (x + 12), "r" (x + 13), "r" (x + 14), "r" (x + 15),
+ "r" (x + 16) : : lab);
+ __builtin_unreachable ();
+ lab:
+ return 0;
+}
The following patch fixes http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55512 The patch was successfully tested and bootstrapped on x86/x86-64. Committed as rev. 193901. 2012-11-28 Vladimir Makarov <vmakarov@redhat.com> PR rtl-optimization/55512 * lra-assigns.c (assign_by_spills): Assigned arbitrary hard regs to failed reload pseudos instead of changing asm pattern. * lra-constraints.c (MAX_CONSTRAINT_ITERATION_NUMBER): Increase value. 2012-11-28 Vladimir Makarov <vmakarov@redhat.com> PR rtl-optimization/55512 * gcc.target/i386/pr55512-[1234].c: New tests.