>From the alias-oracle walk we don't get here with valueized VUSE
so valueize it before looking up an existing value, otherwise
we'll ICE upon insertion which does valueize.
Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.
Richard.
2018-03-27 Richard Biener <rguent...@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.
Index: gcc/tree-ssa-sccvn.c
===================================================================
--- gcc/tree-ssa-sccvn.c (revision 258851)
+++ gcc/tree-ssa-sccvn.c (working copy)
@@ -1631,7 +1631,7 @@ vn_reference_lookup_or_insert_for_pieces
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;
Index: gcc/testsuite/gfortran.dg/pr85082.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr85082.f90 (nonexistent)
+++ gcc/testsuite/gfortran.dg/pr85082.f90 (working copy)
@@ -0,0 +1,14 @@
+! { 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
