From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1005) id 89E903858D28; Wed, 15 Dec 2021 05:56:50 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 89E903858D28 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Michael Meissner To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-5985] Add new constant data structure. X-Act-Checkin: gcc X-Git-Author: Michael Meissner X-Git-Refname: refs/heads/master X-Git-Oldrev: 71cc9b8c39148d19a8043b74ca8b6b4e8b8072ca X-Git-Newrev: c6756b3bc1d2af1c8e86f0ad1711e9b9134520ba Message-Id: <20211215055650.89E903858D28@sourceware.org> Date: Wed, 15 Dec 2021 05:56:50 +0000 (GMT) X-BeenThere: gcc-cvs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 15 Dec 2021 05:56:50 -0000 https://gcc.gnu.org/g:c6756b3bc1d2af1c8e86f0ad1711e9b9134520ba commit r12-5985-gc6756b3bc1d2af1c8e86f0ad1711e9b9134520ba Author: Michael Meissner Date: Wed Dec 15 00:56:25 2021 -0500 Add new constant data structure. This patch provides the data structure and function to convert a CONST_INT, CONST_DOUBLE, CONST_VECTOR, or VEC_DUPLICATE of a constant) to an array of bytes, half-words, words, and double words that can be loaded into a 128-bit vector register. The next patches will use this data structure to generate code that generates load of the vector/floating point registers using the XXSPLTIDP, XXSPLTIW, and LXVKQ instructions that were added in power10. 2021-12-15 Michael Meissner gcc/ * config/rs6000/rs6000-protos.h (VECTOR_128BIT_BITS): New macro. (VECTOR_128BIT_BYTES): Likewise. (VECTOR_128BIT_HALF_WORDS): Likewise. (VECTOR_128BIT_WORDS): Likewise. (VECTOR_128BIT_DOUBLE_WORDS): Likewise. (vec_const_128bit_type): New structure type. (vec_const_128bit_to_bytes): New declaration. * config/rs6000/rs6000.c (constant_int_to_128bit_vector): New helper function. (constant_fp_to_128bit_vector): New helper function. (vec_const_128bit_to_bytes): New function. Diff: --- gcc/config/rs6000/rs6000-protos.h | 28 +++++ gcc/config/rs6000/rs6000.c | 253 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 281 insertions(+) diff --git a/gcc/config/rs6000/rs6000-protos.h b/gcc/config/rs6000/rs6000-protos.h index c01ae005d0b..81345d80952 100644 --- a/gcc/config/rs6000/rs6000-protos.h +++ b/gcc/config/rs6000/rs6000-protos.h @@ -222,6 +222,34 @@ address_is_prefixed (rtx addr, return (iform == INSN_FORM_PREFIXED_NUMERIC || iform == INSN_FORM_PCREL_LOCAL); } + +/* Functions and data structures relating to 128-bit constants that are + converted to byte, half-word, word, and double-word values. All fields are + kept in big endian order. We also convert scalar values to 128-bits if they + are going to be loaded into vector registers. */ +#define VECTOR_128BIT_BITS 128 +#define VECTOR_128BIT_BYTES (128 / 8) +#define VECTOR_128BIT_HALF_WORDS (128 / 16) +#define VECTOR_128BIT_WORDS (128 / 32) +#define VECTOR_128BIT_DOUBLE_WORDS (128 / 64) + +typedef struct { + /* Constant as various sized items. */ + unsigned HOST_WIDE_INT double_words[VECTOR_128BIT_DOUBLE_WORDS]; + unsigned int words[VECTOR_128BIT_WORDS]; + unsigned short half_words[VECTOR_128BIT_HALF_WORDS]; + unsigned char bytes[VECTOR_128BIT_BYTES]; + + unsigned original_size; /* Constant size before splat. */ + bool fp_constant_p; /* Is the constant floating point? */ + bool all_double_words_same; /* Are the double words all equal? */ + bool all_words_same; /* Are the words all equal? */ + bool all_half_words_same; /* Are the half words all equal? */ + bool all_bytes_same; /* Are the bytes all equal? */ +} vec_const_128bit_type; + +extern bool vec_const_128bit_to_bytes (rtx, machine_mode, + vec_const_128bit_type *); #endif /* RTX_CODE */ #ifdef TREE_CODE diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index 4481ba57ed7..819314d9fe9 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -28334,6 +28334,259 @@ rs6000_output_addr_vec_elt (FILE *file, int value) fprintf (file, "\n"); } + +/* Copy an integer constant to the vector constant structure. */ + +static void +constant_int_to_128bit_vector (rtx op, + machine_mode mode, + size_t byte_num, + vec_const_128bit_type *info) +{ + unsigned HOST_WIDE_INT uvalue = UINTVAL (op); + unsigned bitsize = GET_MODE_BITSIZE (mode); + + for (int shift = bitsize - 8; shift >= 0; shift -= 8) + info->bytes[byte_num++] = (uvalue >> shift) & 0xff; +} + +/* Copy a floating point constant to the vector constant structure. */ + +static void +constant_fp_to_128bit_vector (rtx op, + machine_mode mode, + size_t byte_num, + vec_const_128bit_type *info) +{ + unsigned bitsize = GET_MODE_BITSIZE (mode); + unsigned num_words = bitsize / 32; + const REAL_VALUE_TYPE *rtype = CONST_DOUBLE_REAL_VALUE (op); + long real_words[VECTOR_128BIT_WORDS]; + + /* Make sure we don't overflow the real_words array and that it is + filled completely. */ + gcc_assert (num_words <= VECTOR_128BIT_WORDS && (bitsize % 32) == 0); + + real_to_target (real_words, rtype, mode); + + /* Iterate over each 32-bit word in the floating point constant. The + real_to_target function puts out words in target endian fashion. We need + to arrange the order so that the bytes are written in big endian order. */ + for (unsigned num = 0; num < num_words; num++) + { + unsigned endian_num = (BYTES_BIG_ENDIAN + ? num + : num_words - 1 - num); + + unsigned uvalue = real_words[endian_num]; + for (int shift = 32 - 8; shift >= 0; shift -= 8) + info->bytes[byte_num++] = (uvalue >> shift) & 0xff; + } + + /* Mark that this constant involves floating point. */ + info->fp_constant_p = true; +} + +/* Convert a vector constant OP with mode MODE to a vector 128-bit constant + structure INFO. + + Break out the constant out to bytes, half words, words, and double words. + Return true if we have successfully converted the constant. + + We handle CONST_INT, CONST_DOUBLE, CONST_VECTOR, and VEC_DUPLICATE of + constants. Integer and floating point scalar constants are splatted to fill + out the vector. */ + +bool +vec_const_128bit_to_bytes (rtx op, + machine_mode mode, + vec_const_128bit_type *info) +{ + /* Initialize the constant structure. */ + memset ((void *)info, 0, sizeof (vec_const_128bit_type)); + + /* Assume CONST_INTs are DImode. */ + if (mode == VOIDmode) + mode = CONST_INT_P (op) ? DImode : GET_MODE (op); + + if (mode == VOIDmode) + return false; + + unsigned size = GET_MODE_SIZE (mode); + bool splat_p = false; + + if (size > VECTOR_128BIT_BYTES) + return false; + + /* Set up the bits. */ + switch (GET_CODE (op)) + { + /* Integer constants, default to double word. */ + case CONST_INT: + { + constant_int_to_128bit_vector (op, mode, 0, info); + splat_p = true; + break; + } + + /* Floating point constants. */ + case CONST_DOUBLE: + { + /* Fail if the floating point constant is the wrong mode. */ + if (GET_MODE (op) != mode) + return false; + + /* SFmode stored as scalars are stored in DFmode format. */ + if (mode == SFmode) + { + mode = DFmode; + size = GET_MODE_SIZE (DFmode); + } + + constant_fp_to_128bit_vector (op, mode, 0, info); + splat_p = true; + break; + } + + /* Vector constants, iterate over each element. On little endian + systems, we have to reverse the element numbers. */ + case CONST_VECTOR: + { + /* Fail if the vector constant is the wrong mode or size. */ + if (GET_MODE (op) != mode + || GET_MODE_SIZE (mode) != VECTOR_128BIT_BYTES) + return false; + + machine_mode ele_mode = GET_MODE_INNER (mode); + size_t ele_size = GET_MODE_SIZE (ele_mode); + size_t nunits = GET_MODE_NUNITS (mode); + + for (size_t num = 0; num < nunits; num++) + { + rtx ele = CONST_VECTOR_ELT (op, num); + size_t byte_num = (BYTES_BIG_ENDIAN + ? num + : nunits - 1 - num) * ele_size; + + if (CONST_INT_P (ele)) + constant_int_to_128bit_vector (ele, ele_mode, byte_num, info); + else if (CONST_DOUBLE_P (ele)) + constant_fp_to_128bit_vector (ele, ele_mode, byte_num, info); + else + return false; + } + + break; + } + + /* Treat VEC_DUPLICATE of a constant just like a vector constant. + Since we are duplicating the element, we don't have to worry about + endian issues. */ + case VEC_DUPLICATE: + { + /* Fail if the vector duplicate is the wrong mode or size. */ + if (GET_MODE (op) != mode + || GET_MODE_SIZE (mode) != VECTOR_128BIT_BYTES) + return false; + + machine_mode ele_mode = GET_MODE_INNER (mode); + size_t ele_size = GET_MODE_SIZE (ele_mode); + rtx ele = XEXP (op, 0); + size_t nunits = GET_MODE_NUNITS (mode); + + if (!CONST_INT_P (ele) && !CONST_DOUBLE_P (ele)) + return false; + + for (size_t num = 0; num < nunits; num++) + { + size_t byte_num = num * ele_size; + + if (CONST_INT_P (ele)) + constant_int_to_128bit_vector (ele, ele_mode, byte_num, info); + else + constant_fp_to_128bit_vector (ele, ele_mode, byte_num, info); + } + + break; + } + + /* Any thing else, just return failure. */ + default: + return false; + } + + /* Splat the constant to fill 128 bits if desired. */ + if (splat_p && size < VECTOR_128BIT_BYTES) + { + if ((VECTOR_128BIT_BYTES % size) != 0) + return false; + + for (size_t offset = size; + offset < VECTOR_128BIT_BYTES; + offset += size) + memcpy ((void *) &info->bytes[offset], + (void *) &info->bytes[0], + size); + } + + /* Remember original size. */ + info->original_size = size; + + /* Determine if the bytes are all the same. */ + unsigned char first_byte = info->bytes[0]; + info->all_bytes_same = true; + for (size_t i = 1; i < VECTOR_128BIT_BYTES; i++) + if (first_byte != info->bytes[i]) + { + info->all_bytes_same = false; + break; + } + + /* Pack half words together & determine if all of the half words are the + same. */ + for (size_t i = 0; i < VECTOR_128BIT_HALF_WORDS; i++) + info->half_words[i] = ((info->bytes[i * 2] << 8) + | info->bytes[(i * 2) + 1]); + + unsigned short first_hword = info->half_words[0]; + info->all_half_words_same = true; + for (size_t i = 1; i < VECTOR_128BIT_HALF_WORDS; i++) + if (first_hword != info->half_words[i]) + { + info->all_half_words_same = false; + break; + } + + /* Pack words together & determine if all of the words are the same. */ + for (size_t i = 0; i < VECTOR_128BIT_WORDS; i++) + info->words[i] = ((info->bytes[i * 4] << 24) + | (info->bytes[(i * 4) + 1] << 16) + | (info->bytes[(i * 4) + 2] << 8) + | info->bytes[(i * 4) + 3]); + + info->all_words_same + = (info->words[0] == info->words[1] + && info->words[0] == info->words[1] + && info->words[0] == info->words[2] + && info->words[0] == info->words[3]); + + /* Pack double words together & determine if all of the double words are the + same. */ + for (size_t i = 0; i < VECTOR_128BIT_DOUBLE_WORDS; i++) + { + unsigned HOST_WIDE_INT d_word = 0; + for (size_t j = 0; j < 8; j++) + d_word = (d_word << 8) | info->bytes[(i * 8) + j]; + + info->double_words[i] = d_word; + } + + info->all_double_words_same + = (info->double_words[0] == info->double_words[1]); + + return true; +} + struct gcc_target targetm = TARGET_INITIALIZER; #include "gt-rs6000.h"