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

[SUN Guoyun]

On Tue, 14 Feb 2023 03:45:04 GMT, SUN Guoyun <duke 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 on L1 and 32 bytes on L3.
> 
> ========== C1-compiled nmethod =====
> Compiled method (c1)     264   24       1       java.lang.Object::<init> (1 bytes)
> 0x00007f80491ce647:   push   %rbp
> 0x00007f80491ce648:   sub    $0x10,%rsp   //stack sizes is 16 bytes
> 
> ========== C1-compiled nmethod =====
> Compiled method (c1)     283   24       3       java.lang.Object::<init> (1 bytes)
> 0x00007f93711d01c7:   push   %rbp
> 0x00007f93711d01c8:   sub    $0x20,%rsp  // stack sizes is 32 bytes

This pull request has now been integrated.

Changeset: 36a08226
Author:    sunguoyun <sunguoyun at loongson.cn>
Committer: Vladimir Kozlov <kvn at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/36a0822633909e03656159245bbeb954efafa2f2
Stats:     233 lines in 20 files changed: 87 ins; 128 del; 18 mod

8302369: Reduce the stack size of the C1 compiler

Reviewed-by: dlong

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