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Diff for /wikisrc/users/maya/vax-gcc.mdwn between versions 1.7 and 1.12

version 1.7, 2019/08/29 21:57:38 version 1.12, 2019/09/15 12:56:38
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 # Various GCC/vax issues and invesigation #  # Various GCC/vax issues and invesigation #
   
 ## libgomp crash with -O2 ##  [WIP tree](gcc-mirror/)
   
   ## libgomp crash with -O2 [#58901](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58901) ##
 Repro:  Repro:
   
     #!/bin/sh      #!/bin/sh
Line 22  NetBSD avoids it with a [local diff](htt Line 24  NetBSD avoids it with a [local diff](htt
 It looks like a real bug in vax_legitimate_address_p not handling some addressing modes.    It looks like a real bug in vax_legitimate_address_p not handling some addressing modes.  
 The code to handle offset(reg)[index] might be off: it doesn't like if neither xfoo0, xfoo1 are constant.  The code to handle offset(reg)[index] might be off: it doesn't like if neither xfoo0, xfoo1 are constant.
   
   
   ## change_address_1, at emit-rtl.c:2286 [#85152](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85152) ##
   
   Repro:
   
       #!/bin/sh
   
       cat << EOF > oacc.i
       void fn2();
       unsigned a;
       int fn1() {
         int b = a >> 16;
         if (b)
           fn2();
       }
       EOF
       vax--netbsdelf-gcc -O2 -c oacc.i
   
 ## unrecognizable insn with any optimization ##  ## unrecognizable insn with any optimization ##
   
 Repro:  Repro:
Line 64  This errors out with: Line 84  This errors out with:
     during RTL pass: vregs      during RTL pass: vregs
     /home/fly/oacc/decl.ii:17:1: internal compiler error: in extract_insn, at recog.c:2310      /home/fly/oacc/decl.ii:17:1: internal compiler error: in extract_insn, at recog.c:2310
           
 Providing a trivial scheduling will avoid subregs of mem.  
   This is in VAX-specific code. We need to figure out what instruction pattern this is, that we're missing.
   
   <!--Providing a trivial scheduling will avoid subregs of mem.  
   However, this doesn't work for us. Our crash and mem subregs happen at a too early pass, most likely.-->
   
   ## DWARF ##
   
       flag_dwarf2_cfi_asm = 0;
   
   is kind of a big deal. We should probably get rid of it, but [binutils hates that.](https://github.com/NetBSD/src/commit/1df57dce3744cf4743358b098728a0658b80b8fb)
   
       ld: warning: dynamic relocation to `?' in readonly section `.eh_frame'
       ld: warning: dynamic relocation to `?' in readonly section `.eh_frame'
       ld: warning: creating a DT_TEXTREL in a shared object
       ld: .eh_frame_hdr refers to overlapping FDEs
       ld: final link failed: bad value
   
   [riscv seemed to share the issue](https://github.com/riscv/riscv-binutils-gdb/issues/76) and had fixed it.
   
   ## review comments ##
   
   Jeff Law [provided some feedback](https://gcc.gnu.org/ml/gcc/2019-04/msg00281.html). More of it should be addressed.
Removed from v.1.7  
changed lines
  Added in v.1.12

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