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Tue, 19 Dec 2023 01:53:52 -0800 (PST) Received: from slewis-laptop.ba.rivosinc.com ([51.52.155.69]) by smtp.gmail.com with ESMTPSA id q19-20020a05600c46d300b0040b632f31d2sm2079985wmo.5.2023.12.19.01.53.50 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Dec 2023 01:53:51 -0800 (PST) From: Sergei Lewis To: gcc-patches@gcc.gnu.org Subject: [PATCH v2 3/3] RISC-V: cmpmem for RISCV with V extension Date: Tue, 19 Dec 2023 09:53:48 +0000 Message-Id: <20231219095348.356551-4-slewis@rivosinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231219095348.356551-1-slewis@rivosinc.com> References: <20231219095348.356551-1-slewis@rivosinc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,GIT_PATCH_0,KAM_SHORT,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: gcc/ChangeLog: * config/riscv/riscv-protos.h (riscv_vector::expand_vec_cmpmem): New function declaration. * config/riscv/riscv-string.cc (riscv_vector::expand_vec_cmpmem): New function; this generates an inline vectorised memory compare, if and only if we know the entire operation can be performed in a single vector load per input * config/riscv/riscv.md (cmpmemsi): Try riscv_vector::expand_vec_cmpmem for constant lengths gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/base/cmpmem-1.c: New codegen tests * gcc.target/riscv/rvv/base/cmpmem-2.c: New execution tests * gcc.target/riscv/rvv/base/cmpmem-3.c: New codegen tests * gcc.target/riscv/rvv/base/cmpmem-4.c: New codegen tests --- gcc/config/riscv/riscv-protos.h | 1 + gcc/config/riscv/riscv-string.cc | 100 ++++++++++++++++++ gcc/config/riscv/riscv.md | 15 +++ .../gcc.target/riscv/rvv/base/cmpmem-1.c | 88 +++++++++++++++ .../gcc.target/riscv/rvv/base/cmpmem-2.c | 74 +++++++++++++ .../gcc.target/riscv/rvv/base/cmpmem-3.c | 45 ++++++++ .../gcc.target/riscv/rvv/base/cmpmem-4.c | 62 +++++++++++ 7 files changed, 385 insertions(+) create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-1.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-2.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-3.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-4.c diff --git a/gcc/config/riscv/riscv-protos.h b/gcc/config/riscv/riscv-protos.h index c4531589300..301aa9b8889 100644 --- a/gcc/config/riscv/riscv-protos.h +++ b/gcc/config/riscv/riscv-protos.h @@ -638,6 +638,7 @@ void expand_rawmemchr (machine_mode, rtx, rtx, rtx, bool = false); bool expand_strcmp (rtx, rtx, rtx, rtx, unsigned HOST_WIDE_INT, bool); void emit_vec_extract (rtx, rtx, rtx); bool expand_vec_setmem (rtx, rtx, rtx, rtx); +bool expand_vec_cmpmem (rtx, rtx, rtx, rtx); /* Rounding mode bitfield for fixed point VXRM. */ enum fixed_point_rounding_mode diff --git a/gcc/config/riscv/riscv-string.cc b/gcc/config/riscv/riscv-string.cc index e506b92a552..3b634851753 100644 --- a/gcc/config/riscv/riscv-string.cc +++ b/gcc/config/riscv/riscv-string.cc @@ -1337,4 +1337,104 @@ expand_vec_setmem (rtx dst_in, rtx length_in, rtx fill_value_in, return true; } +/* Used by cmpmemsi in riscv.md. */ + +bool +expand_vec_cmpmem (rtx result_out, rtx blk_a_in, rtx blk_b_in, rtx length_in) +{ + HOST_WIDE_INT lmul; + /* Check we are able and allowed to vectorise this operation; + bail if not. */ + if (!check_vectorise_memory_operation (length_in, lmul)) + return false; + + /* Strategy: + load entire blocks at a and b into vector regs + generate mask of bytes that differ + find first set bit in mask + find offset of first set bit in mask, use 0 if none set + result is ((char*)a[offset] - (char*)b[offset]) + */ + + machine_mode vmode + = riscv_vector::get_vector_mode (QImode, BYTES_PER_RISCV_VECTOR * lmul) + .require (); + rtx blk_a_addr = copy_addr_to_reg (XEXP (blk_a_in, 0)); + rtx blk_a = change_address (blk_a_in, vmode, blk_a_addr); + rtx blk_b_addr = copy_addr_to_reg (XEXP (blk_b_in, 0)); + rtx blk_b = change_address (blk_b_in, vmode, blk_b_addr); + + rtx vec_a = gen_reg_rtx (vmode); + rtx vec_b = gen_reg_rtx (vmode); + + machine_mode mask_mode = get_mask_mode (vmode); + rtx mask = gen_reg_rtx (mask_mode); + rtx mismatch_ofs = gen_reg_rtx (Pmode); + + rtx ne = gen_rtx_NE (mask_mode, vec_a, vec_b); + rtx vmsops[] = { mask, ne, vec_a, vec_b }; + rtx vfops[] = { mismatch_ofs, mask }; + + /* If the length is exactly vlmax for the selected mode, do that. + Otherwise, use a predicated store. */ + + if (known_eq (GET_MODE_SIZE (vmode), INTVAL (length_in))) + { + emit_move_insn (vec_a, blk_a); + emit_move_insn (vec_b, blk_b); + emit_vlmax_insn (code_for_pred_cmp (vmode), riscv_vector::COMPARE_OP, + vmsops); + + emit_vlmax_insn (code_for_pred_ffs (mask_mode, Pmode), + riscv_vector::CPOP_OP, vfops); + } + else + { + if (!satisfies_constraint_K (length_in)) + length_in = force_reg (Pmode, length_in); + + rtx memmask = CONSTM1_RTX (mask_mode); + + rtx m_ops_a[] = { vec_a, memmask, blk_a }; + rtx m_ops_b[] = { vec_b, memmask, blk_b }; + + emit_nonvlmax_insn (code_for_pred_mov (vmode), + riscv_vector::UNARY_OP_TAMA, m_ops_a, length_in); + emit_nonvlmax_insn (code_for_pred_mov (vmode), + riscv_vector::UNARY_OP_TAMA, m_ops_b, length_in); + + emit_nonvlmax_insn (code_for_pred_cmp (vmode), riscv_vector::COMPARE_OP, + vmsops, length_in); + + emit_nonvlmax_insn (code_for_pred_ffs (mask_mode, Pmode), + riscv_vector::CPOP_OP, vfops, length_in); + } + + /* Mismatch_ofs is -1 if blocks match, or the offset of + the first mismatch otherwise. */ + rtx ltz = gen_reg_rtx (Xmode); + emit_insn (gen_slt_3 (LT, Xmode, Xmode, ltz, mismatch_ofs, const0_rtx)); + /* mismatch_ofs += (mismatch_ofs < 0) ? 1 : 0. */ + emit_insn ( + gen_rtx_SET (mismatch_ofs, gen_rtx_PLUS (Pmode, mismatch_ofs, ltz))); + + /* Unconditionally load the bytes at mismatch_ofs and subtract them + to get our result. */ + emit_insn (gen_rtx_SET (blk_a_addr, + gen_rtx_PLUS (Pmode, mismatch_ofs, blk_a_addr))); + emit_insn (gen_rtx_SET (blk_b_addr, + gen_rtx_PLUS (Pmode, mismatch_ofs, blk_b_addr))); + + blk_a = change_address (blk_a, QImode, blk_a_addr); + blk_b = change_address (blk_b, QImode, blk_b_addr); + + rtx byte_a = gen_reg_rtx (SImode); + rtx byte_b = gen_reg_rtx (SImode); + do_zero_extendqi2 (byte_a, blk_a); + do_zero_extendqi2 (byte_b, blk_b); + + emit_insn (gen_rtx_SET (result_out, gen_rtx_MINUS (SImode, byte_a, byte_b))); + + return true; +} } diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md index dd34211ca80..08dd22ea733 100644 --- a/gcc/config/riscv/riscv.md +++ b/gcc/config/riscv/riscv.md @@ -2401,6 +2401,21 @@ FAIL; }) +(define_expand "cmpmemsi" + [(set (match_operand:SI 0 "register_operand" "") + (compare:SI (match_operand:BLK 1 "memory_operand" "") + (match_operand:BLK 2 "memory_operand" ""))) + (use (match_operand:SI 3 "general_operand" "")) + (use (match_operand:SI 4 "" ""))] + "TARGET_VECTOR" +{ + if (riscv_vector::expand_vec_cmpmem (operands[0], operands[1], + operands[2], operands[3])) + DONE; + else + FAIL; +}) + ;; Expand in-line code to clear the instruction cache between operand[0] and ;; operand[1]. (define_expand "clear_cache" diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-1.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-1.c new file mode 100644 index 00000000000..d4c665dc791 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-1.c @@ -0,0 +1,88 @@ +/* { dg-do compile } */ +/* { dg-add-options riscv_v } */ +/* { dg-additional-options "-O3 --param=riscv-autovec-lmul=dynamic" } */ +/* { dg-final { check-function-bodies "**" "" } } */ + +#define MIN_VECTOR_BYTES (__riscv_v_min_vlen / 8) + +/* Trivial memcmp should use inline scalar ops. +** f1: +** lbu\s+a\d+,0\(a0\) +** lbu\s+a\d+,0\(a1\) +** subw?\s+a0,a\d+,a\d+ +** ret +*/ +int +f1 (void *a, void *b) +{ + return __builtin_memcmp (a, b, 1); +} + +/* Tiny __builtin_memcmp should use libc. +** f2: +** li\s+a\d,\d+ +** tail\s+memcmp +*/ +int +f2 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES - 1); +} + +/* Vectorise+inline minimum vector register width with LMUL=1 +** f3: +** ( +** vsetivli\s+zero,\d+,e8,m1,ta,ma +** | +** li\s+a\d+,\d+ +** vsetvli\s+zero,a\d+,e8,m1,ta,ma +** ) +** ... +** ret +*/ +int +f3 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES); +} + +/* Vectorised code should use smallest lmul known to fit length +** f4: +** ( +** vsetivli\s+zero,\d+,e8,m2,ta,ma +** | +** li\s+a\d+,\d+ +** vsetvli\s+zero,a\d+,e8,m2,ta,ma +** ) +** ... +** ret +*/ +int +f4 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES + 1); +} + +/* Vectorise+inline up to LMUL=8 +** f5: +** li\s+a\d+,\d+ +** vsetvli\s+zero,a\d+,e8,m8,ta,ma +** ... +** ret +*/ +int +f5 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES * 8); +} + +/* Don't inline if the length is too large for one operation. +** f6: +** li\s+a2,\d+ +** tail\s+memcmp +*/ +int +f6 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES * 8 + 1); +} diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-2.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-2.c new file mode 100644 index 00000000000..81c8bdb33ca --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-2.c @@ -0,0 +1,74 @@ +/* { dg-do run { target { riscv_v } } } */ +/* { dg-add-options riscv_v } */ +/* { dg-options "-O2 --param=riscv-autovec-lmul=dynamic" } */ + +#include + +#define MIN_VECTOR_BYTES (__riscv_v_min_vlen / 8) + +static inline __attribute__ ((always_inline)) void +do_one_test (int const size, int const diff_offset, int const diff_dir) +{ + unsigned char A[size]; + unsigned char B[size]; + unsigned char const fill_value = 0x55; + __builtin_memset (A, fill_value, size); + __builtin_memset (B, fill_value, size); + + if (diff_dir != 0) + { + if (diff_dir < 0) + { + A[diff_offset] = fill_value - 1; + } + else + { + A[diff_offset] = fill_value + 1; + } + } + + if (__builtin_memcmp (A, B, size) != diff_dir) + { + abort (); + } +} + +int +main () +{ + do_one_test (0, 0, 0); + + do_one_test (1, 0, -1); + do_one_test (1, 0, 0); + do_one_test (1, 0, 1); + + do_one_test (MIN_VECTOR_BYTES - 1, 0, -1); + do_one_test (MIN_VECTOR_BYTES - 1, 0, 0); + do_one_test (MIN_VECTOR_BYTES - 1, 0, 1); + do_one_test (MIN_VECTOR_BYTES - 1, 1, -1); + do_one_test (MIN_VECTOR_BYTES - 1, 1, 0); + do_one_test (MIN_VECTOR_BYTES - 1, 1, 1); + + do_one_test (MIN_VECTOR_BYTES, 0, -1); + do_one_test (MIN_VECTOR_BYTES, 0, 0); + do_one_test (MIN_VECTOR_BYTES, 0, 1); + do_one_test (MIN_VECTOR_BYTES, MIN_VECTOR_BYTES - 1, -1); + do_one_test (MIN_VECTOR_BYTES, MIN_VECTOR_BYTES - 1, 0); + do_one_test (MIN_VECTOR_BYTES, MIN_VECTOR_BYTES - 1, 1); + + do_one_test (MIN_VECTOR_BYTES + 1, 0, -1); + do_one_test (MIN_VECTOR_BYTES + 1, 0, 0); + do_one_test (MIN_VECTOR_BYTES + 1, 0, 1); + do_one_test (MIN_VECTOR_BYTES + 1, MIN_VECTOR_BYTES, -1); + do_one_test (MIN_VECTOR_BYTES + 1, MIN_VECTOR_BYTES, 0); + do_one_test (MIN_VECTOR_BYTES + 1, MIN_VECTOR_BYTES, 1); + + do_one_test (MIN_VECTOR_BYTES * 8, 0, -1); + do_one_test (MIN_VECTOR_BYTES * 8, 0, 0); + do_one_test (MIN_VECTOR_BYTES * 8, 0, 1); + do_one_test (MIN_VECTOR_BYTES * 8, MIN_VECTOR_BYTES * 8 - 1, -1); + do_one_test (MIN_VECTOR_BYTES * 8, MIN_VECTOR_BYTES * 8 - 1, 0); + do_one_test (MIN_VECTOR_BYTES * 8, MIN_VECTOR_BYTES * 8 - 1, 1); + + return 0; +} diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-3.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-3.c new file mode 100644 index 00000000000..dfad1b96c60 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-3.c @@ -0,0 +1,45 @@ +/* { dg-do compile } */ +/* { dg-add-options riscv_v } */ +/* { dg-additional-options "-O3 --param riscv-autovec-lmul=m1" } */ +/* { dg-final { check-function-bodies "**" "" } } */ + +#define MIN_VECTOR_BYTES (__riscv_v_min_vlen / 8) + +/* Tiny __builtin_memcmp should use libc. +** f1: +** li\s+a\d,\d+ +** tail\s+memcmp +*/ +int +f1 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES - 1); +} + +/* Vectorise+inline minimum vector register width with LMUL=1 +** f2: +** ( +** vsetivli\s+zero,\d+,e8,m1,ta,ma +** | +** li\s+a\d+,\d+ +** vsetvli\s+zero,a\d+,e8,m1,ta,ma +** ) +** ... +** ret +*/ +int +f2 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES); +} + +/* Don't inline if the length is too large for one operation. +** f3: +** li\s+a2,\d+ +** tail\s+memcmp +*/ +int +f3 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES + 1); +} diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-4.c b/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-4.c new file mode 100644 index 00000000000..55a61eae029 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/base/cmpmem-4.c @@ -0,0 +1,62 @@ +/* { dg-do compile } */ +/* { dg-add-options riscv_v } */ +/* { dg-additional-options "-O3 --param riscv-autovec-lmul=m8" } */ +/* { dg-final { check-function-bodies "**" "" } } */ + +#define MIN_VECTOR_BYTES (__riscv_v_min_vlen / 8) + +/* Tiny __builtin_memcmp should use libc. +** f1: +** li\s+a\d,\d+ +** tail\s+memcmp +*/ +int +f1 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES - 1); +} + +/* Vectorise+inline minimum vector register width with LMUL=8 as requested +** f2: +** ( +** vsetivli\s+zero,\d+,e8,m8,ta,ma +** | +** li\s+a\d+,\d+ +** vsetvli\s+zero,a\d+,e8,m8,ta,ma +** ) +** ... +** ret +*/ +int +f2 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES); +} + +/* Vectorise+inline anything that fits +** f3: +** ( +** vsetivli\s+zero,\d+,e8,m8,ta,ma +** | +** li\s+a\d+,\d+ +** vsetvli\s+zero,a\d+,e8,m8,ta,ma +** ) +** ... +** ret +*/ +int +f3 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES * 8); +} + +/* Don't inline if the length is too large for one operation. +** f4: +** li\s+a2,\d+ +** tail\s+memcmp +*/ +int +f4 (void *a, void *b) +{ + return __builtin_memcmp (a, b, MIN_VECTOR_BYTES * 8 + 1); +} -- 2.34.1