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Siddhesh Poyarekar 9fbb6fa123 tree-object-size: Make unknown a computation
Compute the unknown size value as a function of the min/max bit of
object_size_type.  This transforms into a neat little branchless
sequence on x86_64:

	movl	%edi, %eax
	sarl	%eax
	xorl	$1, %eax
	negl	%eax
	cltq

which should be faster than loading the value from memory.  A quick
unscientific test using

`time make check-gcc RUNTESTFLAGS="dg.exp=builtin*"`

shaves about half a second off execution time with this.  Also simplify
implementation of unknown_object_size.

gcc/ChangeLog:

	* tree-object-size.c (unknown): Make into a function.  Adjust
	all uses.
	(unknown_object_size): Simplify implementation.

Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>
2021-10-20 08:28:20 +05:30
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