RFR: 8331311: C2: Big Endian Port of 8318446: optimize stores into primitive arrays by combining values into larger store

[Richard Reingruber]

On Mon, 13 May 2024 15:53:52 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

> This pr adds a few tweaks to [JDK-8318446](https://bugs.openjdk.org/browse/JDK-8318446) which allows enabling it also on big endian platforms (e.g. AIX, S390). JDK-8318446 introduced a C2 optimization to replace consecutive stores to a primitive array with just one store.
> 
> By example (from `TestMergeStores.java`):
> 
> 
>     static Object[] test2a(byte[] a, int offset, long v) {
>         if (IS_BIG_ENDIAN) {
>             a[offset + 0] = (byte)(v >> 56);
>             a[offset + 1] = (byte)(v >> 48);
>             a[offset + 2] = (byte)(v >> 40);
>             a[offset + 3] = (byte)(v >> 32);
>             a[offset + 4] = (byte)(v >> 24);
>             a[offset + 5] = (byte)(v >> 16);
>             a[offset + 6] = (byte)(v >> 8);
>             a[offset + 7] = (byte)(v >> 0);
>         } else {
>             a[offset + 0] = (byte)(v >> 0);
>             a[offset + 1] = (byte)(v >> 8);
>             a[offset + 2] = (byte)(v >> 16);
>             a[offset + 3] = (byte)(v >> 24);
>             a[offset + 4] = (byte)(v >> 32);
>             a[offset + 5] = (byte)(v >> 40);
>             a[offset + 6] = (byte)(v >> 48);
>             a[offset + 7] = (byte)(v >> 56);
>         }
>         return new Object[]{ a };
>     }
> 
> 
> Depending on the endianess 8 bytes are stored into an array. The order of the stores is the same as the order of an 8-byte-store therefore 8 1-byte-stores can be replaced with just one 8-byte-store (if there aren't too many range checks).
> 
> Additionally I've fixed a few comments and a test bug.
> 
> The optimization seems to be a little bit more effective on big endian platforms.
> 
> Again by example:
> 
> 
>     static Object[] test800a(byte[] a, int offset, long v) {
>         if (IS_BIG_ENDIAN) {
>             a[offset + 0] = (byte)(v >> 40); // Removed from candidate list
>             a[offset + 1] = (byte)(v >> 32); // Removed from candidate list
>             a[offset + 2] = (byte)(v >> 24); // Merged
>             a[offset + 3] = (byte)(v >> 16); // Merged
>             a[offset + 4] = (byte)(v >> 8);  // Merged
>             a[offset + 5] = (byte)(v >> 0);  // Merged
>         } else {
>             a[offset + 0] = (byte)(v >> 0);  // Removed from candidate list
>             a[offset + 1] = (byte)(v >> 8);  // Removed from candidate list
>             a[offset + 2] = (byte)(v >> 16); // Not merged
>             a[offset + 3] = (byte)(v >> 24); // Not merged
>             a[offset + 4] = (byte)(v >> 32); // Not merged
>             a[offset + 5] = (byte)(v >> 40); // Not merged
>         }
>         return new Object[]{ a };...

@offamitkumar you can put this through your testing if you like. It should solve the issues with test/hotspot/jtreg/compiler/c2/TestMergeStores.java also for s390.

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PR Comment: https://git.openjdk.org/jdk/pull/19218#issuecomment-2108093968