[Bug target/70682] New: [6 Regression] -fcompare-debug building LLVM with checking=release compiler on ppc64le

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70682

            Bug ID: 70682
           Summary: [6 Regression] -fcompare-debug building LLVM with
                    checking=release compiler on ppc64le
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
  Target Milestone: ---
            Target: ppc64le

Created attachment 38282
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38282&action=edit
unreduced testcase

On ppc64le running r235027 I get:

trippels@gcc2-power8 llvm_build % g++ --save-temps -fcompare-debug -O3
-fno-devirtualize -c CGStmtOpenMP.gk.ii
g++: error: CGStmtOpenMP.gk.ii: -fcompare-debug failure

trippels@gcc2-power8 llvm_build % diff -u  CGStmtOpenMP.gk.gkd
CGStmtOpenMP.gk.gk.gkd
--- CGStmtOpenMP.gk.gkd 2016-04-15 13:59:37.734070548 +0000
+++ CGStmtOpenMP.gk.gk.gkd      2016-04-15 13:59:50.954364032 +0000
@@ -177184,7 +177184,7 @@
         (mem/f/c:DI (plus:DI (reg/f:DI 1 1)
                 (const_int 928 [0x3a0])) [ MEM[(struct
specific_clause_iterator *)&D.xxxx]+0 S8 A128]))# {*movdi_internal64}
      (nil))
-(insn # 0 0 (set (reg:V2DI 32 0 [orig:786
vect_begin_iterator_D849456_I_665.9647 ] [786])
+(insn # 0 0 (set (reg:V2DI 32 0 [orig:786
vect_begin_iterator_D849458_I_665.9647 ] [786])
         (vec_select:V2DI (mem/c:V2DI (plus:DI (reg/f:DI 1 1)
                     (reg:DI 10 10 [916])) [ MEM[(struct
specific_clause_iterator *)&D.xxxx]+0 S16 A128])
             (parallel [
@@ -177209,12 +177209,12 @@
      (nil))
 (insn:TI # 0 0 (set (mem/c:V2DI (plus:DI (reg/f:DI 1 1)
                 (reg:DI 10 10 [917])) [ MEM[(struct specific_clause_iterator
*)&__for_begin]+0 S16 A128])
-        (vec_select:V2DI (reg:V2DI 32 0 [orig:786
vect_begin_iterator_D849456_I_665.9647 ] [786])
+        (vec_select:V2DI (reg:V2DI 32 0 [orig:786
vect_begin_iterator_D849458_I_665.9647 ] [786])
             (parallel [
                     (const_int 1 [0x1])
                     (const_int 0 [0])
                 ])))
/home/trippels/llvm/tools/clang/lib/CodeGen/CGStmtOpenMP.cpp:2355#
{*vsx_stxvd2x2_le_v2di}
-     (expr_list:REG_DEAD (reg:V2DI 32 0 [orig:786
vect_begin_iterator_D849456_I_665.9647 ] [786])
+     (expr_list:REG_DEAD (reg:V2DI 32 0 [orig:786
vect_begin_iterator_D849458_I_665.9647 ] [786])
         (expr_list:REG_DEAD (reg:DI 10 10 [917])
             (nil))))
 (jump_insn # 0 0 (set (pc)