gnu /
gcc /
60d2bcc55bcc0991c0e58e97edf4a69e847e82c6 RISC-V: Handle "(a & twobits) == singlebit" in branches using Zbs
Use Zbs when generating a sequence for
"if ((a & twobits) == singlebit) ..."
that can be expressed as
bexti + bexti + andn.
gcc/ChangeLog:
* config/riscv/bitmanip.md
(*branch<X:mode>_mask_twobits_equals_singlebit):
Handle "if ((a & T) == C)" using Zbs, when T has 2 bits set and C
has one of these tow bits set.
* config/riscv/predicates.md (const_twobits_not_arith_operand):
New predicate.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/zbs-if_then_else-01.c: New test.
3 files changed
