GCC modified for the FreeChainXenon project
c1680bd2df
The code to assign large/huge _BitInt SSA_NAMEs to partitions intentionally
ignores uninitialized SSA_NAMEs:
/* Also ignore uninitialized uses. */
if (SSA_NAME_IS_DEFAULT_DEF (s)
&& (!SSA_NAME_VAR (s) || VAR_P (SSA_NAME_VAR (s))))
continue;
because there is no need to store them into memory, all we need is when
trying to extract some limb from them use uninitialized SSA_NAME for the
limb.
The following testcase shows this is a problem for call arguments though,
for those we need to create replacement SSA_NAMEs which are loaded from
the underlying variable. For uninitialized SSA_NAMEs because we didn't
create underlying variable for them var_to_partition doesn't work, the
following patch handles it by just creating an uninitialized replacement
SSA_NAME.
2024-01-12 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/113316
* gimple-lower-bitint.cc (bitint_large_huge::lower_call): Handle
uninitialized large/huge _BitInt arguments to calls.
* gcc.dg/bitint-67.c: New test.
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