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c++: Shrink lambda-expr 

I noticed the default capture mode and the discriminator both used
ints.  That seems excessive.  This shrinks them to 8 bits and 16 bits
respectively.  I suppose the discriminator could use the remaining 24
bits of an int allocation unit, if we're worried about more that 64K
lambdas per function.  I know, users are strange :)  On a 64 bit system
this saves 64 bits, because we also had 32 bits of padding added.

	gcc/cp/
	* cp-tree.h (struct tree_lambda_expr): Shrink
	default_capture_mode & discriminator.
This commit is contained in:
Nathan Sidwell 2020-07-22 08:07:25 -07:00
parent 18d96339d2
commit 63fa0927e8
1 changed files with 2 additions and 2 deletions
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4
gcc/cp/cp-tree.h
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@ -1442,8 +1442,8 @@ struct GTY (()) tree_lambda_expr
tree extra_scope;
vec<tree, va_gc> *pending_proxies;
location_t locus;
enum cp_lambda_default_capture_mode_type default_capture_mode;
int discriminator;
enum cp_lambda_default_capture_mode_type default_capture_mode : 8;
short int discriminator;
};
/* Non-zero if this template specialization has access violations that