On 5/25/26 12:38, Jonathan Yong wrote:
On 5/19/26 17:34, oltolm wrote:
On x86_64 Windows targets using MS ABI, GCC classified 256-bit and
512-bit vector returns as memory returns. That caused hidden sret
pointer returns where YMM0/ZMM0 returns are expected.
Teach MS ABI return classification to keep 32-byte and 64-byte vector
returns in registers when AVX/AVX512F is enabled, matching the return
register selection path.
Also extend function_value_ms_64 so 32-byte and 64-byte eligible vector
returns are mapped to the SSE register class (YMM0/ZMM0 lanes).
Add tests for x86_64-*-mingw* that verify 256-bit and 512-bit vector
returns use YMM0/ZMM0 codegen.
PR target/89597
* config/i386/i386.cc (function_value_ms_64): Handle 32-byte and
64-byte vector returns in registers when supported.
(ix86_return_in_memory): Do not force 32-byte/64-byte eligible
vector returns to memory for MS ABI.
* testsuite/gcc.target/i386/pr89597-1.c: New test.
* testsuite/gcc.target/i386/pr89597-2.c: New test.
Can you please check against x86_64 linux to make sure it doesn't cause
issues? Just make sure the test results are similar with and without the
change. Thanks.
Tested, no change in testsuite numbers. Pushed to master branch.
