arm: Fix arm {,u}subvdi4 and usubvsi4 expanders [PR94286]

The following testcase ICEs, because these expanders will happily create
a SImode 0x80000000 CONST_INT, which is not valid RTL, as CONST_INTs need to
be sign extended from the mode precision to full HWI.

2020-03-24  Jakub Jelinek  <jakub@redhat.com>

	PR target/94286
	* config/arm/arm.md (subvdi4, usubvsi4, usubvdi4): Use gen_int_mode
	instead of GEN_INT.

	* gcc.dg/pr94286.c: New test.

gcc/ChangeLog

 2020-03-24  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/94286
+	* config/arm/arm.md (subvdi4, usubvsi4, usubvdi4): Use gen_int_mode
+	instead of GEN_INT.
+
 	PR debug/94285
 	* tree-ssa-loop-manip.c (create_iv): If after, set stmt location to
 	e->goto_locus even if gsi_bb (*incr_pos) contains only debug stmts.

gcc/config/arm/arm.md

@@ -1481,7 +1481,7 @@
     lo_op2 = force_reg (SImode, lo_op2);
   if (CONST_INT_P (lo_op2))
     emit_insn (gen_cmpsi2_addneg (lo_result, lo_op1, lo_op2,
-				  GEN_INT (-INTVAL (lo_op2))));
+				  gen_int_mode (-INTVAL (lo_op2), SImode)));
   else
     emit_insn (gen_subsi3_compare1 (lo_result, lo_op1, lo_op2));
 
@@ -1525,7 +1525,8 @@
     }
   else if (CONST_INT_P (operands[2]))
     emit_insn (gen_cmpsi2_addneg (operands[0], operands[1], operands[2],
-				  GEN_INT (-INTVAL (operands[2]))));
+				  gen_int_mode (-INTVAL (operands[2]),
+						SImode)));
   else if (CONST_INT_P (operands[1]))
     {
       mode = CC_RSBmode;
@@ -1597,7 +1598,7 @@
     lo_op2 = force_reg (SImode, lo_op2);
   if (CONST_INT_P (lo_op2))
     emit_insn (gen_cmpsi2_addneg (lo_result, lo_op1, lo_op2,
-				  GEN_INT (-INTVAL (lo_op2))));
+				  gen_int_mode (-INTVAL (lo_op2), SImode)));
   else
     emit_insn (gen_subsi3_compare1 (lo_result, lo_op1, lo_op2));
 

gcc/testsuite/ChangeLog

 2020-03-24  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/94286
+	* gcc.dg/pr94286.c: New test.
+
 	PR debug/94285
 	* gfortran.dg/pr94285.f90: New test.
 

gcc/testsuite/gcc.dg/pr94286.c

+/* PR target/94286 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -g" } */
+
+unsigned a, b;
+
+int
+foo (void)
+{
+  return __builtin_sub_overflow (a, 0x80000000U, &b);
+}