RFR(M): 8204240: Extend MDO to allow more reasons to be recorded per bci

[Vladimir Kozlov]

Looks good. I will testing on our platforms and let you know.

Thanks,
Vladimir

On 6/12/18 6:20 AM, Roland Westrelin wrote:
> 
> http://cr.openjdk.java.net/~roland/8204240/webrev.00/
> 
> The number of traps that can be recorded per bci is currently limited to
> 8. This patch changes the layout of the DataLayout header so more traps
> can be recorded per bci.
> 
> This change was part of 8203197: "C2: consider all paths in loop body
> for loop predication" but I was asked to integrate separately. That
> review thread has some discussion about that change.
> 
> Note this patch modifies platform specific code. I verified x86 (32 and
> 64 bits), aarch64. Sparc is ok AFAICT but I couldn't verify it. For PPC
> and arm32 I will need someone to take a closer look.
> 
> Roland.
>