Summary

find more efficient way to bulk-init locally allocated data

Metadata

• Id: 1551cc693ff2527a57a60f3d7f54e18cc7b2cfae
• Trac id: 436
• Type: task
• Reporter: felix
• Owner: felix
• Cc:
• Status: closed
• Component: compiler
• Estimated difficulty:
• Resolution: wontfix
• Priority: minor
• Milestone:
• Version: 4.6.x
• Changetime: 2010-12-10 09:41:02 UTC
• Created: 2010-11-30 16:04:32 UTC
• Keywords: code generation

Description

For example, `letrec` creates code like this:

 C_word t1517;
 C_word t1518;
 C_word t1519;
 C_word ab[2291],*a=ab;
 C_check_for_interrupt;
 if(!C_stack_probe(&a)){
 C_save_and_reclaim((void*)tr2,(void*)f_37706,2,t0,t1);}
 t2=C_SCHEME_UNDEFINED;
 t3=(*a=C_VECTOR_TYPE|1,a[1]=t2,tmp=(C_word)a,a+=2,tmp);
 t4=C_SCHEME_UNDEFINED;
 t5=(*a=C_VECTOR_TYPE|1,a[1]=t4,tmp=(C_word)a,a+=2,tmp);
 t6=C_SCHEME_UNDEFINED;
 t7=(*a=C_VECTOR_TYPE|1,a[1]=t6,tmp=(C_word)a,a+=2,tmp);
 t8=C_SCHEME_UNDEFINED;
 t9=(*a=C_VECTOR_TYPE|1,a[1]=t8,tmp=(C_word)a,a+=2,tmp);
 t10=C_SCHEME_UNDEFINED;
 t11=(*a=C_VECTOR_TYPE|1,a[1]=t10,tmp=(C_word)a,a+=2,tmp);
 t12=C_SCHEME_UNDEFINED;
 t13=(*a=C_VECTOR_TYPE|1,a[1]=t12,tmp=(C_word)a,a+=2,tmp);
 t14=C_SCHEME_UNDEFINED;
 t15=(*a=C_VECTOR_TYPE|1,a[1]=t14,tmp=(C_word)a,a+=2,tmp);
 t16=C_SCHEME_UNDEFINED;
 t17=(*a=C_VECTOR_TYPE|1,a[1]=t16,tmp=(C_word)a,a+=2,tmp);
 t18=C_SCHEME_UNDEFINED;

One could use local array initializers or so to reduce the amount of code generated.

Changes and comments

[2010-12-10 09:41:02 UTC] felix changed status from new to closed

[2010-12-10 09:41:02 UTC] felix set resolution to wontfix

[2010-12-10 09:41:02 UTC] felix wrote:

Since the compiler has to create the local data anyway, I can't see much improvement by using any other construct.