re PR rtl-optimization/78241 (wrong code with -funroll-loops)

PR rtl-optimization/78241
	* loop-unroll.c (unroll_loop_runtime_iterations): Don't adjust 'niter', but
	emit initial peel copy if niter expr is not reliable.

From-SVN: r245152

gcc/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2017-02-03  Pat Haugen  <pthaugen@us.ibm.com>
+
+	PR target/79158
+	* gcc.target/powerpc/pr70669.c: Use 'r' in an expression to force back
+	to VSX reg.
+
 2017-02-02  Jan Hubicka  <hubicka@ucw.cz>
 
 	* gcc.dg/tree-ssa/ssa-ifcombine-1.c: Check for no profile mismatches.

gcc/testsuite/gcc.target/powerpc/pr70669.c

@@ -13,7 +13,7 @@ void foo (TYPE *p, TYPE *q)
 #ifndef NO_ASM
   __asm__ (" # %0" : "+r" (r));
 #endif
-  *p = r;
+  *p = r + r;
 }
 
 /* { dg-final { scan-assembler       "mfvsrd"    } } */