Hi all, While the SVE2 NBSL instruction accepts MOVPRFX to add more flexibility due to its tied operands, the destination of the movprfx cannot be also a source operand. But the offending pattern in aarch64-sve2.md tries to do exactly that for the "=?&w,w,w" alternative and gas warns for the attached testcase.
This patch just removes that alternative causing RA to emit a normal extra
move.
So for the testcase in the patch we now generate:
nor_z:
nbsl z1.d, z1.d, z2.d, z1.d
mov z0.d, z1.d
ret
instead of the previous:
nor_z:
movprfx z0, z1
nbsl z0.d, z0.d, z2.d, z0.d
ret
which generated a gas warning.
Bootstrapped and tested on aarch64-none-linux-gnu.
Ok for trunk?
Do we want to backport it?
Thanks,
Kyrill
Signed-off-by: Kyrylo Tkachov <ktkac...@nvidia.com>
gcc/
PR target/120999
* config/aarch64/aarch64-sve2.md (*aarch64_sve2_nor<mode>):
Remove movprfx alternative.
gcc/testsuite/
PR target/120999
* gcc.target/aarch64/sve2/pr120999.c: New test.
0001-aarch64-PR-target-120999-Avoid-movprfx-for-NBSL-impl.patch
Description: 0001-aarch64-PR-target-120999-Avoid-movprfx-for-NBSL-impl.patch
