From cd5ff7bc323a8fa6eafc4513bc814e4e7fa24120 Mon Sep 17 00:00:00 2001 From: Richard Sandiford Date: Tue, 2 Jan 2018 18:28:14 +0000 Subject: [PATCH] Make CONST_VECTOR_ELT handle implicitly-encoded elements This patch makes CONST_VECTOR_ELT handle implicitly-encoded elements, in a similar way to VECTOR_CST_ELT. 2018-01-02 Richard Sandiford gcc/ * rtl.h (CONST_VECTOR_ELT): Redefine to const_vector_elt. (const_vector_encoded_nelts): New function. (CONST_VECTOR_NUNITS): Redefine to use GET_MODE_NUNITS. (const_vector_int_elt, const_vector_elt): Declare. * emit-rtl.c (const_vector_int_elt_1): New function. (const_vector_elt): Likewise. * simplify-rtx.c (simplify_immed_subreg): Avoid taking the address of CONST_VECTOR_ELT. From-SVN: r256104 --- gcc/ChangeLog | 11 +++++++++ gcc/emit-rtl.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++ gcc/rtl.h | 14 ++++++++++-- gcc/simplify-rtx.c | 6 ++--- 4 files changed, 82 insertions(+), 5 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 32396b98c64..c6d87f41c3d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,14 @@ +2018-01-02 Richard Sandiford + + * rtl.h (CONST_VECTOR_ELT): Redefine to const_vector_elt. + (const_vector_encoded_nelts): New function. + (CONST_VECTOR_NUNITS): Redefine to use GET_MODE_NUNITS. + (const_vector_int_elt, const_vector_elt): Declare. + * emit-rtl.c (const_vector_int_elt_1): New function. + (const_vector_elt): Likewise. + * simplify-rtx.c (simplify_immed_subreg): Avoid taking the address + of CONST_VECTOR_ELT. + 2018-01-02 Richard Sandiford * expr.c: Include rtx-vector-builder.h. diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c index c9599e19ec0..e282b3d13cd 100644 --- a/gcc/emit-rtl.c +++ b/gcc/emit-rtl.c @@ -5862,6 +5862,62 @@ init_emit (void) #endif } +/* Return the value of element I of CONST_VECTOR X as a wide_int. */ + +wide_int +const_vector_int_elt (const_rtx x, unsigned int i) +{ + /* First handle elements that are directly encoded. */ + machine_mode elt_mode = GET_MODE_INNER (GET_MODE (x)); + if (i < (unsigned int) XVECLEN (x, 0)) + return rtx_mode_t (CONST_VECTOR_ENCODED_ELT (x, i), elt_mode); + + /* Identify the pattern that contains element I and work out the index of + the last encoded element for that pattern. */ + unsigned int encoded_nelts = const_vector_encoded_nelts (x); + unsigned int npatterns = CONST_VECTOR_NPATTERNS (x); + unsigned int count = i / npatterns; + unsigned int pattern = i % npatterns; + unsigned int final_i = encoded_nelts - npatterns + pattern; + + /* If there are no steps, the final encoded value is the right one. */ + if (!CONST_VECTOR_STEPPED_P (x)) + return rtx_mode_t (CONST_VECTOR_ENCODED_ELT (x, final_i), elt_mode); + + /* Otherwise work out the value from the last two encoded elements. */ + rtx v1 = CONST_VECTOR_ENCODED_ELT (x, final_i - npatterns); + rtx v2 = CONST_VECTOR_ENCODED_ELT (x, final_i); + wide_int diff = wi::sub (rtx_mode_t (v2, elt_mode), + rtx_mode_t (v1, elt_mode)); + return wi::add (rtx_mode_t (v2, elt_mode), (count - 2) * diff); +} + +/* Return the value of element I of CONST_VECTOR X. */ + +rtx +const_vector_elt (const_rtx x, unsigned int i) +{ + /* First handle elements that are directly encoded. */ + if (i < (unsigned int) XVECLEN (x, 0)) + return CONST_VECTOR_ENCODED_ELT (x, i); + + /* If there are no steps, the final encoded value is the right one. */ + if (!CONST_VECTOR_STEPPED_P (x)) + { + /* Identify the pattern that contains element I and work out the index of + the last encoded element for that pattern. */ + unsigned int encoded_nelts = const_vector_encoded_nelts (x); + unsigned int npatterns = CONST_VECTOR_NPATTERNS (x); + unsigned int pattern = i % npatterns; + unsigned int final_i = encoded_nelts - npatterns + pattern; + return CONST_VECTOR_ENCODED_ELT (x, final_i); + } + + /* Otherwise work out the value from the last two encoded elements. */ + return immed_wide_int_const (const_vector_int_elt (x, i), + GET_MODE_INNER (GET_MODE (x))); +} + /* Return true if X is a valid element for a CONST_VECTOR of the given mode. */ diff --git a/gcc/rtl.h b/gcc/rtl.h index 64012d0058b..ee0ce22e8e7 100644 --- a/gcc/rtl.h +++ b/gcc/rtl.h @@ -1969,7 +1969,7 @@ set_regno_raw (rtx x, unsigned int regno, unsigned int nregs) ((HOST_WIDE_INT) (CONST_FIXED_VALUE (r)->data.low)) /* For a CONST_VECTOR, return element #n. */ -#define CONST_VECTOR_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR) +#define CONST_VECTOR_ELT(RTX, N) const_vector_elt (RTX, N) /* See rtl.texi for a description of these macros. */ #define CONST_VECTOR_NPATTERNS(RTX) \ @@ -1988,8 +1988,16 @@ set_regno_raw (rtx x, unsigned int regno, unsigned int nregs) #define CONST_VECTOR_ENCODED_ELT(RTX, N) XCVECEXP (RTX, 0, N, CONST_VECTOR) +/* Return the number of elements encoded directly in a CONST_VECTOR. */ + +inline unsigned int +const_vector_encoded_nelts (const_rtx x) +{ + return CONST_VECTOR_NPATTERNS (x) * CONST_VECTOR_NELTS_PER_PATTERN (x); +} + /* For a CONST_VECTOR, return the number of elements in a vector. */ -#define CONST_VECTOR_NUNITS(RTX) XCVECLEN (RTX, 0, CONST_VECTOR) +#define CONST_VECTOR_NUNITS(RTX) GET_MODE_NUNITS (GET_MODE (RTX)) /* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of. SUBREG_BYTE extracts the byte-number. */ @@ -3001,6 +3009,8 @@ unwrap_const_vec_duplicate (T x) } /* In emit-rtl.c. */ +extern wide_int const_vector_int_elt (const_rtx, unsigned int); +extern rtx const_vector_elt (const_rtx, unsigned int); extern bool const_vec_series_p_1 (const_rtx, rtx *, rtx *); /* Return true if X is an integer constant vector that contains a linear diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index fd6cba7ce02..22cabc5e534 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -5991,13 +5991,11 @@ simplify_immed_subreg (fixed_size_mode outermode, rtx op, if (GET_CODE (op) == CONST_VECTOR) { num_elem = CONST_VECTOR_NUNITS (op); - elems = &CONST_VECTOR_ELT (op, 0); elem_bitsize = GET_MODE_UNIT_BITSIZE (innermode); } else { num_elem = 1; - elems = &op; elem_bitsize = max_bitsize; } /* If this asserts, it is too complicated; reducing value_bit may help. */ @@ -6008,7 +6006,9 @@ simplify_immed_subreg (fixed_size_mode outermode, rtx op, for (elem = 0; elem < num_elem; elem++) { unsigned char * vp; - rtx el = elems[elem]; + rtx el = (GET_CODE (op) == CONST_VECTOR + ? CONST_VECTOR_ELT (op, elem) + : op); /* Vectors are kept in target memory order. (This is probably a mistake.) */ -- 2.30.2