From: Christoph Müllner <christoph.muell...@vrull.eu> Some constants can be built up using rotate-right instructions. The code that enables this can be found in riscv_build_integer_1(). However, this functionality is only available for Zbb, which includes the rori instruction. This patch enables this also for XTheadBb, which includes the th.srri instruction.
Signed-off-by: Christoph Müllner <christoph.muell...@vrull.eu> gcc/ChangeLog: * config/riscv/riscv.cc (riscv_build_integer_1): Enable constant synthesis with rotate-right for XTheadBb. gcc/testsuite/ChangeLog: * gcc.target/riscv/xtheadbb-li-rotr.c: New test. --- gcc/config/riscv/riscv.cc | 2 +- .../gcc.target/riscv/xtheadbb-li-rotr.c | 34 +++++++++++++++++++ 2 files changed, 35 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/gcc.target/riscv/xtheadbb-li-rotr.c diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc index 2db9c81ac8b..ef63079de8e 100644 --- a/gcc/config/riscv/riscv.cc +++ b/gcc/config/riscv/riscv.cc @@ -566,7 +566,7 @@ riscv_build_integer_1 (struct riscv_integer_op codes[RISCV_MAX_INTEGER_OPS], } } - if (cost > 2 && TARGET_64BIT && TARGET_ZBB) + if (cost > 2 && TARGET_64BIT && (TARGET_ZBB || TARGET_XTHEADBB)) { int leading_ones = clz_hwi (~value); int trailing_ones = ctz_hwi (~value); diff --git a/gcc/testsuite/gcc.target/riscv/xtheadbb-li-rotr.c b/gcc/testsuite/gcc.target/riscv/xtheadbb-li-rotr.c new file mode 100644 index 00000000000..ecd50448d77 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/xtheadbb-li-rotr.c @@ -0,0 +1,34 @@ +/* { dg-do compile } */ +/* { dg-options "-march=rv64gc_xtheadbb" } */ + +long +li_rori (void) +{ + return 0xffff77ffffffffffL; +} + +long +li_rori_2 (void) +{ + return 0x77ffffffffffffffL; +} + +long +li_rori_3 (void) +{ + return 0xfffffffeefffffffL; +} + +long +li_rori_4 (void) +{ + return 0x5ffffffffffffff5L; +} + +long +li_rori_5 (void) +{ + return 0xaffffffffffffffaL; +} + +/* { dg-final { scan-assembler-times "th.srri\t" 5 } } */ -- 2.41.0