[Bug tree-optimization/91458] New: FAIL: g++.dg/tree-ssa/pr19807.C -std=gnu++98 scan-tree-dump-times optimized "&MEM\\\\[\\\\(void .\\\\)&a \\\\+ 8B\\\\]" 3

[danglin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91458

            Bug ID: 91458
           Summary: FAIL: g++.dg/tree-ssa/pr19807.C  -std=gnu++98
                    scan-tree-dump-times optimized "&MEM\\\\[\\\\(void
                    .\\\\)&a \\\\+ 8B\\\\]" 3
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: danglin at gcc dot gnu.org
  Target Milestone: ---
              Host: hppa2.0w-hp-hpux11.11
            Target: hppa2.0w-hp-hpux11.11
             Build: hppa2.0w-hp-hpux11.11

We have the following fails:

FAIL: g++.dg/tree-ssa/pr19807.C  -std=gnu++98  scan-tree-dump-times optimized
"&MEM\\\\[\\\\(void .\\\\)&a \\\\+ 8B\\\\]" 3
FAIL: g++.dg/tree-ssa/pr19807.C  -std=gnu++14  scan-tree-dump-times optimized
"&MEM\\\\[\\\\(void .\\\\)&a \\\\+ 8B\\\\]" 3
FAIL: g++.dg/tree-ssa/pr19807.C  -std=gnu++17  scan-tree-dump-times optimized
"&MEM\\\\[\\\\(void .\\\\)&a \\\\+ 8B\\\\]" 3

spawn /test/gnu/gcc/objdir/gcc/testsuite/g++/../../xg++
-B/test/gnu/gcc/objdir/gcc/testsuite/g++/../../
/test/gnu/gcc/gcc/gcc/testsuite/g++.dg/tree-ssa/pr19807.C
-fno-diagnostics-show-caret -fno-diagnostics-show-line-numbers
-fdiagnostics-color=never -nostdinc++
-I/test/gnu/gcc/objdir/hppa2.0w-hp-hpux11.11/libstdc++-v3/include/hppa2.0w-hp-hpux11.11
-I/test/gnu/gcc/objdir/hppa2.0w-hp-hpux11.11/libstdc++-v3/include
-I/test/gnu/gcc/gcc/libstdc++-v3/libsupc++
-I/test/gnu/gcc/gcc/libstdc++-v3/include/backward
-I/test/gnu/gcc/gcc/libstdc++-v3/testsuite/util -fmessage-length=0 -std=gnu++98
-O -fdump-tree-optimized -S -o pr19807.s
PASS: g++.dg/tree-ssa/pr19807.C  -std=gnu++98 (test for excess errors)
g++.dg/tree-ssa/pr19807.C  -std=gnu++98 : pattern found 0 times
FAIL: g++.dg/tree-ssa/pr19807.C  -std=gnu++98  scan-tree-dump-times optimized
"&MEM\\[\\(void .\\)&a \\+ 8B\\]" 3

In tree dump, we have:

;; Function foo (_Z3foov, funcdef_no=0, decl_uid=1894, cgraph_uid=1,
symbol_orde
r=4)

foo ()
{
  <bb 2> [local count: 1073741824]:
  x = &MEM <int> [(void *)&a + 8B];
  y = &MEM <int> [(void *)&a + 8B];
  z = &MEM <int> [(void *)&a + 8B];
  return;

}

Similar fail:
FAIL: g++.dg/tree-ssa/ssa-dse-1.C   scan-tree-dump-times dse1
"MEM\\\\[\\\\(struct FixBuf \\\\*\\\\)&<retval> \\\\+ [0-9]+B\\\\] = {}" 1

Here we have:
  MEM <char[172]> [(struct FixBuf *)&<retval> + 28B] = {};