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alpha.c (alpha_pass_by_reference): Pass un-named SFmode and SCmode arguments by reference.

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* config/alpha/alpha.c (alpha_pass_by_reference): Pass un-named
	SFmode and SCmode arguments by reference.

From-SVN: r240116
This commit is contained in:
Uros Bizjak 2016-09-13 18:29:40 +02:00
parent 254830bab2
commit 809aff7457
2 changed files with 32 additions and 9 deletions
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18
gcc/ChangeLog
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@ -1,3 +1,8 @@
2016-09-13 Uros Bizjak <ubizjak@gmail.com>
* config/alpha/alpha.c (alpha_pass_by_reference): Pass un-named
SFmode and SCmode arguments by reference.
2016-09-13 David Malcolm <dmalcolm@redhat.com>
* diagnostic-show-locus.c (selftest::test_one_liner_fixit_insert):
@ -6,8 +11,7 @@
for renaming of add_fixit_insert to add_fixit_insert_before.
(selftest::test_one_liner_fixit_insert_after): New function.
(selftest::test_one_liner_fixit_validation_adhoc_locations):
Update for renaming of add_fixit_insert to
add_fixit_insert_before.
Update for renaming of add_fixit_insert to add_fixit_insert_before.
(selftest::test_one_liner_many_fixits): Likewise.
(selftest::test_diagnostic_show_locus_one_liner): Update for
renaming, call new test function.
@ -16,16 +20,14 @@
(selftest::test_fixit_consolidation): Likewise.
* diagnostic.c (selftest::test_print_parseable_fixits_insert):
Likewise.
* edit-context.c (selftest::test_applying_fixits_insert): Rename
to...
* edit-context.c (selftest::test_applying_fixits_insert): Rename to...
(selftest::test_applying_fixits_insert_before): ...this.
(selftest::test_applying_fixits_insert): Update for renaming of
add_fixit_insert to add_fixit_insert_before.
(selftest::test_applying_fixits_insert_after): New function.
(selftest::test_applying_fixits_insert_after_at_line_end): New
function.
(selftest::test_applying_fixits_insert_after_failure): New
function.
(selftest::test_applying_fixits_insert_after_failure): New function.
(selftest::test_applying_fixits_multiple): Update for renaming of
add_fixit_insert to add_fixit_insert_before.
(selftest::change_line): Likewise.
@ -33,8 +35,8 @@
(selftest::test_applying_fixits_line_out_of_range): Likewise.
(selftest::test_applying_fixits_column_validation): Likewise.
(selftest::test_applying_fixits_column_validation): Likewise.
(selftest::edit_context_c_tests): Update for renamed test
function; call new test functions.
(selftest::edit_context_c_tests): Update for renamed test function;
call new test functions.
2016-09-13 Pat Haugen <pthaugen@us.ibm.com>

23
gcc/config/alpha/alpha.c
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@ -5754,8 +5754,29 @@ static bool
alpha_pass_by_reference (cumulative_args_t ca ATTRIBUTE_UNUSED,
machine_mode mode,
const_tree type ATTRIBUTE_UNUSED,
bool named ATTRIBUTE_UNUSED)
bool named)
{
/* Pass float and _Complex float variable arguments by reference.
This avoids 64-bit store from a FP register to a pretend args save area
and subsequent 32-bit load from the saved location to a FP register.
Note that 32-bit loads and stores to/from a FP register on alpha reorder
bits to form a canonical 64-bit value in the FP register. This fact
invalidates compiler assumption that 32-bit FP value lives in the lower
32-bits of the passed 64-bit FP value, so loading the 32-bit value from
the stored 64-bit location using 32-bit FP load is invalid on alpha.
This introduces sort of ABI incompatibility, but until _Float32 was
introduced, C-family languages promoted 32-bit float variable arg to
a 64-bit double, and it was not allowed to pass float as a varible
argument. Passing _Complex float as a variable argument never
worked on alpha. Thus, we have no backward compatibility issues
to worry about, and passing unpromoted _Float32 and _Complex float
as a variable argument will actually work in the future. */
if (mode == SFmode || mode == SCmode)
return !named;
return mode == TFmode || mode == TCmode;
}