re PR rtl-optimization/83620 (ICE: in assign_by_spills, at lra-assigns.c:1470:…

re PR rtl-optimization/83620 (ICE: in assign_by_spills, at lra-assigns.c:1470: unable to find a register to spill with -flive-range-shrinkage --param=max-sched-ready-insns=0)

	PR rtl-optimization/86620
	* params.def (max-sched-ready-insns): Bump minimum value to 1.

	* gcc.dg/pr64935-2.c: Use --param=max-sched-ready-insns=1
	instead of --param=max-sched-ready-insns=0.
	* gcc.target/i386/pr83620.c: New test.
	* gcc.dg/pr83620.c: New test.

From-SVN: r256729

gcc/ChangeLog

 2018-01-16  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/86620
+	* params.def (max-sched-ready-insns): Bump minimum value to 1.
+
 	PR rtl-optimization/83213
 	* recog.c (peep2_attempt): Copy over CROSSING_JUMP_P from peepinsn
 	to last if both are JUMP_INSNs.

gcc/params.def

@@ -744,7 +744,7 @@ DEFPARAM (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE,
 DEFPARAM(PARAM_MAX_SCHED_READY_INSNS,
 	 "max-sched-ready-insns",
 	 "The maximum number of instructions ready to be issued to be considered by the scheduler during the first scheduling pass.",
-	 100, 0, 0)
+	 100, 1, 0)
 
 /* This is the maximum number of active local stores RTL DSE will consider.  */
 DEFPARAM (PARAM_MAX_DSE_ACTIVE_LOCAL_STORES,

gcc/testsuite/ChangeLog

 2018-01-16  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/86620
+	* gcc.dg/pr64935-2.c: Use --param=max-sched-ready-insns=1
+	instead of --param=max-sched-ready-insns=0.
+	* gcc.target/i386/pr83620.c: New test.
+	* gcc.dg/pr83620.c: New test.
+
 	PR tree-optimization/83843
 	* gcc.dg/store_merging_18.c: New test.
 

gcc/testsuite/gcc.dg/pr64935-2.c

 /* PR rtl-optimization/64935 */
 /* { dg-do compile } */
-/* { dg-options "-O -fschedule-insns --param=max-sched-ready-insns=0 -fcompare-debug" } */
+/* { dg-options "-O -fschedule-insns --param=max-sched-ready-insns=1 -fcompare-debug" } */
 /* { dg-require-effective-target scheduling } */
 /* { dg-xfail-if "" { powerpc-ibm-aix* } } */
 

gcc/testsuite/gcc.dg/pr83620.c

+/* PR rtl-optimization/86620 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -flive-range-shrinkage --param=max-sched-ready-insns=0" } */
+/* { dg-error "minimum value of parameter 'max-sched-ready-insns' is 1" "" { target *-*-* } 0 } */
+
+void
+foo (void)
+{
+}

gcc/testsuite/gcc.target/i386/pr83620.c

+/* PR rtl-optimization/86620 */
+/* { dg-do compile { target int128 } } */
+/* { dg-options "-O2 -flive-range-shrinkage --param=max-sched-ready-insns=1 -Wno-psabi -mno-avx" } */
+
+typedef unsigned __int128 V __attribute__ ((vector_size (64)));
+
+V u, v;
+
+V
+foo (char c, short d, int e, long f, __int128 g)
+{
+  f >>= c & 63;
+  v = (V){f} == u;
+  return e + g + v;
+}