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Expand with the failure and information from segher.

    1: # Various GCC/vax issues and invesigation #
    2: 
    3: ## libgomp crash with -O2 ##
    4: Repro:
    5: 
    6:     #!/bin/sh
    7:     
    8:     cat << EOF > oacc.i
    9:     int a, b;
   10:     int e() {
   11:       short *c = 0;
   12:       char d = c[a + 1];
   13:       b = d;
   14:       a += 2;
   15:     }
   16:     EOF
   17:     vax--netbsdelf-gcc -O2 -c oacc.i
   18: 
   19: Asserts at emit-rtl.c:2310 gcc_assert (memory_address_addr_space_p (mode, addr, as));
   20: 
   21: NetBSD avoids it with a [local diff](https://github.com/NetBSD/src/commit/e437e96750193b86d0464965661f616e011056fa) to reload.c/dse.c.  
   22: It looks like a real bug in vax_legitimate_address_p not handling some addressing modes.  
   23: The code to handle offset(reg)[index] might be off: it doesn't like if neither xfoo0, xfoo1 are constant.
   24: 
   25: ## unrecognizable insn with any optimization ##
   26: 
   27: Repro:
   28: 
   29:     #!/bin/sh
   30: 
   31:     cat << EOF > decl.ii
   32:     struct a {
   33:       long long *b() const;
   34:     };
   35:     template <typename> class d : a {
   36:     public:
   37:       template <typename e> d(e);
   38:       long long f() const;
   39:     };
   40:     template <typename c> long long d<c>::f() const {
   41:       int g;
   42:       return b()[g];
   43:     }
   44:     int h;
   45:     bool i() {
   46:       d<int> j(h);
   47:       return j.f();
   48:     }
   49:     EOF
   50:     vax--netbsdelf-g++ -O2 -c decl.ii
   51: 
   52: This errors out with:
   53: 
   54:     $ env PATH=$PWD:$PATH ./xgcc -fno-use-linker-plugin -c -O2 ~/oacc/decl.ii -fno-tree-vectorize
   55:     /home/fly/oacc/decl.ii: In function 'bool i()':
   56:     /home/fly/oacc/decl.ii:17:1: error: unrecognizable insn:
   57:        17 | }
   58:           | ^
   59:     (insn 13 12 14 2 (set (reg:SI 33)
   60:             (subreg:SI (mem:DI (plus:SI (mult:SI (reg/v:SI 24 [ g ])
   61:                             (const_int 8 [0x8]))
   62:                         (reg/f:SI 23 [ _6 ])) [1 *_10+0 S8 A32]) 4)) "/home/fly/oacc/decl.ii":16:14 -1
   63:          (nil))
   64:     during RTL pass: vregs
   65:     /home/fly/oacc/decl.ii:17:1: internal compiler error: in extract_insn, at recog.c:2310
   66:     
   67: Providing a trivial scheduling will avoid subregs of mem.