On 4/25/25 9:25 PM, Andrew Pinski wrote:
This adds the simplification of a ZERO_EXTEND of an AND. This optimization
was already handled in combine via combine_simplify_rtx and the handling
there of compound_operations (ZERO_EXTRACT).
Build and tested for aarch64-linux-gnu.
Bootstrapped and tested on x86_64-linux-gnu.
gcc/ChangeLog:
* simplify-rtx.cc (simplify_context::simplify_unary_operation_1) <case
ZERO_EXTEND>:
Add simplifcation for and with a constant.
Funny. That might allow simplification of a patch Shreya and I were
about to submit.
On the RISC-V port we do not define SHIFT_COUNT_TRUNCATED so if we want
to eliminate any explicit masking of the shift count/bit position we
need patterns which incorporate the masking operation.
While putting those together recently we found that we often had an
extraneous zero_extend. That was the last technical question on that
patchkit.
OK for the trunk.
jeff
