S/390: Fix failing RTL check in s390_canonicalize_comparison

The new sigfpe-eh.c fails with

    internal compiler error: RTL check: expected elt 0 type 'e' or 'u', have 'w' (rtx const_int)

This is most likely due to a typo: XEXP (*op1, 0) was used, when
XEXP (*op0, 1) was intended.  This did not cause any user-visible
problems, because reversed_comparison_code_parts ignores the
respective argument, and the release compiler is built without RTL
checks.

gcc/ChangeLog:

2019-09-03  Ilya Leoshkevich  <iii@linux.ibm.com>

	* config/s390/s390.c (s390_canonicalize_comparison): Use XEXP
	(*op0, 1) instead of XEXP (*op1, 0).

gcc/testsuite/ChangeLog:

2019-09-03  Ilya Leoshkevich  <iii@linux.ibm.com>

	* gcc.target/s390/sigfpe-eh.c: New test.

From-SVN: r275336

gcc/ChangeLog

+2019-09-03  Ilya Leoshkevich  <iii@linux.ibm.com>
+
+	* config/s390/s390.c (s390_canonicalize_comparison): Use XEXP
+	(*op0, 1) instead of XEXP (*op1, 0).
+
 2019-09-03  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* config/aarch64/aarch64.md (UNSPEC_FJCVTZS): Define.

gcc/config/s390/s390.c

@@ -1783,7 +1783,7 @@ s390_canonicalize_comparison (int *code, rtx *op0, rtx *op1,
       if (*code == EQ)
 	new_code = reversed_comparison_code_parts (GET_CODE (*op0),
 						   XEXP (*op0, 0),
-						   XEXP (*op1, 0), NULL);
+						   XEXP (*op0, 1), NULL);
       else
 	new_code = GET_CODE (*op0);
 

gcc/testsuite/ChangeLog

+2019-09-03  Ilya Leoshkevich  <iii@linux.ibm.com>
+
+	* gcc.target/s390/sigfpe-eh.c: New test.
+
 2019-09-03  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* gcc.target/aarch64/acle/jcvt_1.c: New test.