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Annotation of wikisrc/users/maya/vax-gcc.mdwn, revision 1.4

1.1       maya        1: # Various GCC/vax issues and invesigation #
                      2: 
1.4     ! maya        3: ## libgomp crash with -O2 ##
1.1       maya        4: Repro:
                      5: 
1.2       maya        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: 
1.1       maya       19: Asserts at emit-rtl.c:2310 gcc_assert (memory_address_addr_space_p (mode, addr, as));
                     20: 
1.3       maya       21: NetBSD avoids it with a [local diff](5f534f20bc66738c05c442a8f20088f55335b653/external/gpl3/gcc/dist/libgcc/gthr-posix.h#L418) to reload.c/dse.c.  
                     22: It looks like a real bug in vax_legitimate_address_p not handling some addressing modes.  
1.2       maya       23: The code to handle offset(reg)[index] might be off: it doesn't like if neither xfoo0, xfoo1 are constant.
1.4     ! maya       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: