From: Pan Li <pan2...@intel.com> Similar to the avg_floor, the avg_ceil has the rounding mode towards +inf, while the vaadd.vv has the rnu which totally match the sematics. From RVV spec, the fixed vaadd.vv with rnu,
roundoff_signed(v, d) = (signed(v) >> d) + r r = v[d - 1] For vaadd, d = 1, then we have roundoff_signed(v, 1) = (signed(v) >> 1) + v[0] If v[0] is bit 0, nothing need to do as there is no rounding. If v[0] is bit 1, there will be rounding with 2 cases. Case 1: v is positive. roundoff_signed(v, 1) = (signed(v) >> 1) + 1, aka round towards +inf roundoff_signed(2 + 3, 1) = (5 >> 1) + 1 = 3 Case 2: v is negative. roundoff_signed(v, 1) = (signed(v) >> 1) + 1, aka round towards +inf roundoff_signed(-9 + 2, 1) = (-7 >> 1) + 1 = -4 + 1 = -3 Thus, we can leverage the vaadd with rnu directly for avg_ceil. The below test suites are passed for this patch series. * The rv64gcv fully regression test. Pan Li (3): RISC-V: Leverage vaadd.vv for signed standard name avg_ceil RISC-V: Reconcile the existing test for avg_ceil RISC-V: Add test cases for avg_ceil vaadd implementation gcc/config/riscv/autovec.md | 25 +-- .../gcc.target/riscv/rvv/autovec/avg.h | 17 ++ .../rvv/autovec/avg_ceil-1-i16-from-i32.c | 12 ++ .../rvv/autovec/avg_ceil-1-i16-from-i64.c | 12 ++ .../rvv/autovec/avg_ceil-1-i32-from-i64.c | 12 ++ .../rvv/autovec/avg_ceil-1-i8-from-i16.c | 12 ++ .../rvv/autovec/avg_ceil-1-i8-from-i32.c | 12 ++ .../rvv/autovec/avg_ceil-1-i8-from-i64.c | 12 ++ .../rvv/autovec/avg_ceil-run-1-i16-from-i32.c | 16 ++ .../rvv/autovec/avg_ceil-run-1-i16-from-i64.c | 16 ++ .../rvv/autovec/avg_ceil-run-1-i32-from-i64.c | 16 ++ .../rvv/autovec/avg_ceil-run-1-i8-from-i16.c | 16 ++ .../rvv/autovec/avg_ceil-run-1-i8-from-i32.c | 16 ++ .../rvv/autovec/avg_ceil-run-1-i8-from-i64.c | 16 ++ .../gcc.target/riscv/rvv/autovec/avg_data.h | 176 ++++++++++++++++++ .../gcc.target/riscv/rvv/autovec/vls/avg-4.c | 6 +- .../gcc.target/riscv/rvv/autovec/vls/avg-5.c | 6 +- .../gcc.target/riscv/rvv/autovec/vls/avg-6.c | 6 +- .../riscv/rvv/autovec/widen/vec-avg-rv32gcv.c | 2 +- .../riscv/rvv/autovec/widen/vec-avg-rv64gcv.c | 2 +- 20 files changed, 375 insertions(+), 33 deletions(-) create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-1-i16-from-i32.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-1-i16-from-i64.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-1-i32-from-i64.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-1-i8-from-i16.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-1-i8-from-i32.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-1-i8-from-i64.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-run-1-i16-from-i32.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-run-1-i16-from-i64.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-run-1-i32-from-i64.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-run-1-i8-from-i16.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-run-1-i8-from-i32.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/avg_ceil-run-1-i8-from-i64.c -- 2.43.0
