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| author | Jason Merrill <jason@redhat.com> | 2021-06-13 14:00:12 -0400 |
|---|---|---|
| committer | Jason Merrill <jason@redhat.com> | 2021-06-21 10:50:01 -0400 |
| commit | 7232f7c4c2d727431096a7ecfcf4ad4db71dcf2a (patch) | |
| tree | 2705e5c36221bf19624c09c493ee9bd193a4cc94 /gcc/df-scan.c | |
| parent | 12bdd39755a25d237b7776153cbe03e171396fc5 (diff) | |
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expand: empty class return optimization [PR88529]
The x86_64 psABI says that an empty class isn't passed or returned in memory
or registers, so we shouldn't set %eax in this function.
The df-scan hunk catches the case where we look at a 0-length reg and build
a range the length of unsigned int, which happened before I changed
assign_parms to match expand_function_end.
PR target/88529
gcc/ChangeLog:
* df-scan.c (df_ref_record): Check that regno < endregno.
* function.c (assign_parms, expand_function_end): Do nothing with a
TYPE_EMPTY_P result.
gcc/testsuite/ChangeLog:
* g++.target/i386/empty-class1.C: New test.
Diffstat (limited to 'gcc/df-scan.c')
| -rw-r--r-- | gcc/df-scan.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/df-scan.c b/gcc/df-scan.c index 1268536..e9da64f 100644 --- a/gcc/df-scan.c +++ b/gcc/df-scan.c @@ -2595,6 +2595,8 @@ df_ref_record (enum df_ref_class cl, ref_flags |= DF_REF_PARTIAL; ref_flags |= DF_REF_MW_HARDREG; + gcc_assert (regno < endregno); + hardreg = problem_data->mw_reg_pool->allocate (); hardreg->type = ref_type; hardreg->flags = ref_flags; |