https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115921
--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jeff Law <l...@gcc.gnu.org>: https://gcc.gnu.org/g:c8957c8779954c3b0bade1dde0a8987b4db157b4 commit r15-4224-gc8957c8779954c3b0bade1dde0a8987b4db157b4 Author: Jovan Vukic <jovan.vu...@rt-rk.com> Date: Wed Oct 9 16:53:38 2024 -0600 RISC-V: Optimize branches with shifted immediate operands After the valuable feedback I received, itâs clear to me that the oversight was in the tests showing the benefits of the patch. In the test file, I added functions f5 and f6, which now generate more efficient code with fewer instructions. Before the patch: f5: li a4,2097152 addi a4,a4,-2048 li a5,1167360 and a0,a0,a4 addi a5,a5,-2048 beq a0,a5,.L4 f6: li a5,3407872 addi a5,a5,-2048 and a0,a0,a5 li a5,1114112 beq a0,a5,.L7 After the patch: f5: srli a5,a0,11 andi a5,a5,1023 li a4,569 beq a5,a4,.L5 f6: srli a5,a0,11 andi a5,a5,1663 li a4,544 beq a5,a4,.L9 PR target/115921 gcc/ChangeLog: * config/riscv/iterators.md (any_eq): New code iterator. * config/riscv/riscv.h (COMMON_TRAILING_ZEROS): New macro. (SMALL_AFTER_COMMON_TRAILING_SHIFT): Ditto. * config/riscv/riscv.md (*branch<ANYI:mode>_shiftedarith_<optab>_shifted): New pattern. gcc/testsuite/ChangeLog: * gcc.target/riscv/branch-1.c: Additional tests.
