RFR: 8302369: Reduce the stack size of the C1 compiler

[SUN Guoyun]

On Wed, 15 Feb 2023 19:02:28 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> The current fact is that C1 uses more stack space than the C2 compiler, taking method `java.lang.Object::<init>`as an example on the x86_64 platform , the stack size used is 48 bytes for C1 compiler, while only 16 bytes is used for C2 compiler.
>> 
>> ========== C1-compiled nmethod =====
>> 0x00007f93311cc747: push %rbp
>> 0x00007f93311cc748: sub $0x30,%rsp // stack sizes is 48 bytes
>> 
>> 
>> ========== C2-compiled nmethod =======
>>     pushq rbp # Save rbp
>>     subq rsp, #16 # Create frame //stack sizes is 16 bytes
>> 
>> After this patch, the C1 compiler will use less stack space. also taking method `java.lang.Object::<init>`as an example on the x86_64 platform , the stack size used is 16 bytes, which is the same as C2 compiler.
>> 
>> ========== C1-compiled nmethod =====
>> 0x00007f80491ce647:   push   %rbp
>> 0x00007f80491ce648:   sub    $0x10,%rsp   //stack sizes is 16 bytes
>
> My -Xcomp run without changes passed without issues. So something in these changes causing problem on machines we use (AMD and old MacOs x86 which have only AVX2).

Thanks @vnkozlov a lot. The machines with the fatal SEGV error is 32-bit architecture, right? Or can you list the hardware information of the machine to me?

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PR: https://git.openjdk.org/jdk/pull/12548