The following patch fixes
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70703
The patch was successfully bootstrapped and tested on x86-64.
Committed as rev. 246707
Index: ChangeLog
===================================================================
--- ChangeLog (revision 246706)
+++ ChangeLog (working copy)
@@ -1,3 +1,10 @@
+2017-04-05 Vladimir Makarov <vmaka...@redhat.com>
+
+ PR rtl-optimization/70703
+ * ira-color.c (update_costs_from_allocno): Use the smallest mode.
+ (update_conflict_hard_regno_costs): Use long instead of unsigned
+ arithmetic for cost calculation.
+
2017-04-05 Jakub Jelinek <ja...@redhat.com>
Bernd Edlinger <bernd.edlin...@hotmail.de>
Index: testsuite/ChangeLog
===================================================================
--- testsuite/ChangeLog (revision 246706)
+++ testsuite/ChangeLog (working copy)
@@ -1,3 +1,8 @@
+2017-04-05 Vladimir Makarov <vmaka...@redhat.com>
+
+ PR rtl-optimization/70703
+ * gcc.target/i386/pr70703.c: New.
+
2017-04-05 Jakub Jelinek <ja...@redhat.com>
PR sanitizer/80308
Index: ira-color.c
===================================================================
--- ira-color.c (revision 246536)
+++ ira-color.c (working copy)
@@ -1367,6 +1367,16 @@ update_costs_from_allocno (ira_allocno_t
|| ALLOCNO_ASSIGNED_P (another_allocno))
continue;
+ if (GET_MODE_SIZE (ALLOCNO_MODE (cp->second)) < GET_MODE_SIZE (mode))
+ /* If we have different modes use the smallest one. It is
+ a sub-register move. It is hard to predict what LRA
+ will reload (the pseudo or its sub-register) but LRA
+ will try to minimize the data movement. Also for some
+ register classes bigger modes might be invalid,
+ e.g. DImode for AREG on x86. For such cases the
+ register move cost will be maximal. */
+ mode = ALLOCNO_MODE (cp->second);
+
cost = (cp->second == allocno
? ira_register_move_cost[mode][rclass][aclass]
: ira_register_move_cost[mode][aclass][rclass]);
@@ -1512,7 +1522,7 @@ update_conflict_hard_regno_costs (int *c
index = ira_class_hard_reg_index[aclass][hard_regno];
if (index < 0)
continue;
- cost = (int) ((unsigned) conflict_costs [i] * mult) / div;
+ cost = (int) (((long) conflict_costs [i] * mult) / div);
if (cost == 0)
continue;
cont_p = true;
Index: testsuite/gcc.target/i386/pr70703.c
===================================================================
--- testsuite/gcc.target/i386/pr70703.c (nonexistent)
+++ testsuite/gcc.target/i386/pr70703.c (working copy)
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fomit-frame-pointer" } */
+/* { dg-require-effective-target ia32 } */
+/* { dg-final { scan-assembler "movl\t\\\$6700417, %eax" } } */
+
+unsigned ud_x_641_mul(unsigned x) {
+ /* optimized version of x / 641 */
+ return ((unsigned long long)x * 0x663d81) >> 32;
+}
