rs6000: Fix split of ashdi3_extswsli_dot for memory (PR71670)

The splitter for ashdi3_extswsli_dot for cr0 with memory uses emit_insn
gen_ashdi3_extswsli_dot, which does not work because that emits a scratch,
while the splitter runs after reload so there should be a real register
instead.  We can laboriously fix that up, or emit using
gen_ashdi3_extswsli_dot2 instead.  This patch does the latter.


	PR target/71670
	* config/rs6000/rs6000.md (ashdi3_extswsli_dot): Use
	gen_ashdi3_extswsli_dot2 instead of gen_ashdi3_extswsli_dot.

gcc/testsuite/
	PR target/71670
	* gcc.target/powerpc/pr71670.c: New testcase.

From-SVN: r237813

gcc/ChangeLog

+2016-06-27  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/71670
+	* config/rs6000/rs6000.md (ashdi3_extswsli_dot): Use
+	gen_ashdi3_extswsli_dot2 instead of gen_ashdi3_extswsli_dot.
+
 2016-06-27  Pat Haugen  <pthaugen@us.ibm.com>
 
 	* config/rs6000/rs6000.md ('type' attribute): Add

gcc/config/rs6000/rs6000.md

@@ -4094,7 +4094,7 @@
 
   if (REGNO (cr) == CR0_REGNO)
     {
-      emit_insn (gen_ashdi3_extswsli_dot (dest, src2, shift, cr));
+      emit_insn (gen_ashdi3_extswsli_dot2 (dest, src2, shift, cr));
       DONE;
     }
 

gcc/testsuite/ChangeLog

+2016-06-27  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR target/71670
+	* gcc.target/powerpc/pr71670.c: New testcase.
+
 2016-06-27  Peter Bergner  <bergner@vnet.ibm.com>
 
 	PR target/71656

gcc/testsuite/gcc.target/powerpc/pr71670.c

+/* { dg-do compile { target { powerpc*-*-* } } } */
+/* { dg-skip-if "do not override -mcpu" { powerpc*-*-* } { "-mcpu=*" } { "-mcpu=power9" } } */
+/* { dg-options "-mcpu=power9 -O1" } */
+
+volatile int a;
+int b;
+void fn1(void) { b + (long)b || a; }