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| author | Richard Sandiford <richard.sandiford@linaro.org> | 2017-11-01 11:49:34 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2017-11-01 11:49:34 +0000 |
| commit | ef1d3b57d2d00795c6eb01fe6b8ef6f413163c67 (patch) | |
| tree | af7a96746cc35a998026456f2e51bdbaea611a6a /gcc/gimple-ssa-store-merging.c | |
| parent | ef339d6e2e846ba7ff544def1d79f10762da223d (diff) | |
| download | gcc-ef1d3b57d2d00795c6eb01fe6b8ef6f413163c67.zip gcc-ef1d3b57d2d00795c6eb01fe6b8ef6f413163c67.tar.gz gcc-ef1d3b57d2d00795c6eb01fe6b8ef6f413163c67.tar.bz2 | |
Add a fixed_size_mode class
This patch adds a fixed_size_mode machine_mode wrapper
for modes that are known to have a fixed size. That applies
to all current modes, but future patches will add support for
variable-sized modes.
The use of this class should be pretty restricted. One important
use case is to hold the mode of static data, which can never be
variable-sized with current file formats. Another is to hold
the modes of registers involved in __builtin_apply and
__builtin_result, since those interfaces don't cope well with
variable-sized data.
The class can also be useful when reinterpreting the contents of
a fixed-length bit string as a different kind of value.
2017-11-01 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
gcc/
* machmode.h (fixed_size_mode): New class.
* rtl.h (get_pool_mode): Return fixed_size_mode.
* gengtype.c (main): Add fixed_size_mode.
* target.def (get_raw_result_mode): Return a fixed_size_mode.
(get_raw_arg_mode): Likewise.
* doc/tm.texi: Regenerate.
* targhooks.h (default_get_reg_raw_mode): Return a fixed_size_mode.
* targhooks.c (default_get_reg_raw_mode): Likewise.
* config/ia64/ia64.c (ia64_get_reg_raw_mode): Likewise.
* config/mips/mips.c (mips_get_reg_raw_mode): Likewise.
* config/msp430/msp430.c (msp430_get_raw_arg_mode): Likewise.
(msp430_get_raw_result_mode): Likewise.
* config/avr/avr-protos.h (regmask): Use as_a <fixed_side_mode>
* dbxout.c (dbxout_parms): Require fixed-size modes.
* expr.c (copy_blkmode_from_reg, copy_blkmode_to_reg): Likewise.
* gimple-ssa-store-merging.c (encode_tree_to_bitpos): Likewise.
* omp-low.c (lower_oacc_reductions): Likewise.
* simplify-rtx.c (simplify_immed_subreg): Take fixed_size_modes.
(simplify_subreg): Update accordingly.
* varasm.c (constant_descriptor_rtx::mode): Change to fixed_size_mode.
(force_const_mem): Update accordingly. Return NULL_RTX for modes
that aren't fixed-size.
(get_pool_mode): Return a fixed_size_mode.
(output_constant_pool_2): Take a fixed_size_mode.
Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r254300
Diffstat (limited to 'gcc/gimple-ssa-store-merging.c')
| -rw-r--r-- | gcc/gimple-ssa-store-merging.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c index 5a5b776..0bc4813 100644 --- a/gcc/gimple-ssa-store-merging.c +++ b/gcc/gimple-ssa-store-merging.c @@ -415,8 +415,11 @@ encode_tree_to_bitpos (tree expr, unsigned char *ptr, int bitlen, int bitpos, The awkwardness comes from the fact that bitpos is counted from the most significant bit of a byte. */ + /* We must be dealing with fixed-size data at this point, since the + total size is also fixed. */ + fixed_size_mode mode = as_a <fixed_size_mode> (TYPE_MODE (TREE_TYPE (expr))); /* Allocate an extra byte so that we have space to shift into. */ - unsigned int byte_size = GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr))) + 1; + unsigned int byte_size = GET_MODE_SIZE (mode) + 1; unsigned char *tmpbuf = XALLOCAVEC (unsigned char, byte_size); memset (tmpbuf, '\0', byte_size); /* The store detection code should only have allowed constants that are |