Hi, Adding support for extv<mode> and extzv<mode> on aarch64 as described in PR86901. I also changed extract_bit_field_using_extv to use gen_lowpart_if_possible instead of gen_lowpart directly. Using gen_lowpart directly will fail with an ICE in building libgcc when the compiler fails to successfully do so whereas gen_lowpart_if_possible will bail out of matching this pattern gracefully.
I'm looking through past mails and https://gcc.gnu.org/contribute.html which details testing bootstrap. I'm building a cross-compiler (x64_aarch64) and the instructions don't address that scenario. The GCC cross-build is green and there's no regressions on the C/C++ tests (The go/fortran etc. look like they need additional infrastructure built on my side to work). Is there a workflow for cross-builds or should I aim to get an aarch64 native machine for full validation? ChangeLog: 2020-02-03 Di Mo <mod...@microsoft.com> gcc/ * config/aarch64/aarch64.md: Add define_expand for extv<mode> and extzv<mode>. * expmed.c (extract_bit_field_using_extv): Change gen_lowpart to gen_lowpart_if_possible to avoid compiler assert building libgcc. testsuite/ * gcc.target/aarch64/pr86901.c: Add new test. Best, Modi
pr86901.patch
Description: pr86901.patch
