re PR tree-optimization/85082 (ICE with -Ofast in vn_reference_insert_pieces, at…

re PR tree-optimization/85082 (ICE with -Ofast in vn_reference_insert_pieces, at tree-ssa-sccvn.c:2624)

2018-03-27  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/85082
	* tree-ssa-sccvn.c (vn_reference_lookup_or_insert_for_pieces):
	Valueize the VUSE.

	* gfortran.dg/pr85082.f90: New testcase.

From-SVN: r258877

gcc/ChangeLog

+2018-03-27  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/85082
+	* tree-ssa-sccvn.c (vn_reference_lookup_or_insert_for_pieces):
+	Valueize the VUSE.
+
 2018-03-27  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
 
 	* config.gcc (aarch64*-*-linux*): New TARGET_DEFAULT_ASYNC_UNWIND_TABLES

gcc/testsuite/ChangeLog

+2018-03-27  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/85082
+	* gfortran.dg/pr85082.f90: New testcase.
+
 2018-03-27  Chenghua Xu  <paul.hua.gm@gmail.com>
 
 	* gcc.target/mips/umips-stroe16-2.c: Change "length = 2"

gcc/testsuite/gfortran.dg/pr85082.f90

+! { dg-do compile }
+! { dg-options "-Ofast" }
+program p
+   real(4) :: a, b
+   integer(4) :: n, m
+   equivalence (a, n)
+   a = 1024.0
+   m = 8
+   a = 1024.0
+   b = set_exponent(a, m)
+   n = 8
+   a = f(a, n)
+   b = set_exponent(a, m)
+end

gcc/tree-ssa-sccvn.c

@@ -1631,7 +1631,7 @@ vn_reference_lookup_or_insert_for_pieces (tree vuse,
   vn_reference_s vr1;
   vn_reference_t result;
   unsigned value_id;
-  vr1.vuse = vuse;
+  vr1.vuse = vuse ? SSA_VAL (vuse) : NULL_TREE;
   vr1.operands = operands;
   vr1.type = type;
   vr1.set = set;