File:  [NetBSD Developer Wiki] / wikisrc / users / maya / vax-gcc.mdwn
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Thu Aug 29 20:39:43 2019 UTC (5 months, 3 weeks ago) by maya
Branches: MAIN
CVS tags: HEAD
add another creduced crash, so I won't have to look from scratch

    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](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.  
   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: 

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