RFR: 8256009: Remove src/hotspot/share/adlc/Test/i486.ad

[Jie Fu]

On Mon, 9 Nov 2020 08:02:13 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Might also be a good time to rewrite the references to `x486.ad` to either `x86.ad` or `x86_32.ad` or `x86_64.ad`:
> 
> ```
> $ ack i486.ad src
> src/hotspot/os_cpu/linux_x86/os_linux_x86.cpp
> 343:          // TODO: The encoding of D2I in i486.ad can cause an exception
> 
> src/hotspot/os_cpu/bsd_x86/os_bsd_x86.cpp
> 552:          // TODO: The encoding of D2I in i486.ad can cause an exception
> 
> src/hotspot/cpu/ppc/ppc.ad
> 3891:  // Comment taken from i486.ad:
> 3903:  // Comment taken from i486.ad:
> 
> src/hotspot/share/opto/parse2.cpp
> 2340:      // For i486.ad, FILD doesn't restrict precision to 24 or 53 bits.
> 2355:    // For i486.ad, rounding is always necessary (see _l2f above).
> 
> src/hotspot/share/opto/machnode.hpp
> 154:  // Only returns non-null value for i486.ad's indOffset32X
> 
> src/hotspot/share/opto/machnode.cpp
> 298:    // In i486.ad, indOffset32X uses base==RegI and disp==RegP,
> 
> src/hotspot/share/adlc/output_c.cpp
> 3003:      // See BugId 4796752, operand indOffset32X in i486.ad
> 
> src/hotspot/share/runtime/synchronizer.cpp
> 62:// variants of the enter-exit fast-path operations.  See i486.ad fast_lock(),
> ```

Good idea. 
Updated.
Thanks.

-------------

PR: https://git.openjdk.java.net/jdk/pull/1107