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author | Richard Sandiford <richard.sandiford@linaro.org> | 2017-10-26 16:53:43 +0000 |
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committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2017-10-26 16:53:43 +0000 |
commit | bd5a2c67cfd636b6c78f213c8ee6dac62323eff9 (patch) | |
tree | 793d74fec25534f3062be8641413cfa6430d1cf0 /gcc/rtl.h | |
parent | 204d2c03acff4bf3b73cb5d2c9578b50c2aac703 (diff) | |
download | gcc-bd5a2c67cfd636b6c78f213c8ee6dac62323eff9.zip gcc-bd5a2c67cfd636b6c78f213c8ee6dac62323eff9.tar.gz gcc-bd5a2c67cfd636b6c78f213c8ee6dac62323eff9.tar.bz2 |
Add wider_subreg_mode helper functions
This patch adds helper functions that say which of the two modes
involved in a subreg is the larger, preferring the outer mode in
the event of a tie. It also converts IRA and reload to track modes
instead of byte sizes, since this is slightly more convenient when
variable-sized modes are added later.
2017-10-26 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
gcc/
* rtl.h (wider_subreg_mode): New function.
* ira.h (ira_sort_regnos_for_alter_reg): Take a machine_mode *
rather than an unsigned int *.
* ira-color.c (regno_max_ref_width): Replace with...
(regno_max_ref_mode): ...this new variable.
(coalesced_pseudo_reg_slot_compare): Update accordingly.
Use wider_subreg_mode.
(ira_sort_regnos_for_alter_reg): Likewise. Take a machine_mode *
rather than an unsigned int *.
* lra-constraints.c (uses_hard_regs_p): Use wider_subreg_mode.
(process_alt_operands): Likewise.
(invariant_p): Likewise.
* lra-spills.c (assign_mem_slot): Likewise.
(add_pseudo_to_slot): Likewise.
* lra.c (collect_non_operand_hard_regs): Likewise.
(add_regs_to_insn_regno_info): Likewise.
* reload1.c (regno_max_ref_width): Replace with...
(regno_max_ref_mode): ...this new variable.
(reload): Update accordingly. Update call to
ira_sort_regnos_for_alter_reg.
(alter_reg): Update to use regno_max_ref_mode. Call wider_subreg_mode.
(init_eliminable_invariants): Update to use regno_max_ref_mode.
(scan_paradoxical_subregs): Likewise.
Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r254115
Diffstat (limited to 'gcc/rtl.h')
-rw-r--r-- | gcc/rtl.h | 18 |
1 files changed, 18 insertions, 0 deletions
@@ -2877,6 +2877,24 @@ subreg_lowpart_offset (machine_mode outermode, machine_mode innermode) GET_MODE_SIZE (innermode)); } +/* Given that a subreg has outer mode OUTERMODE and inner mode INNERMODE, + return the mode that is big enough to hold both the outer and inner + values. Prefer the outer mode in the event of a tie. */ + +inline machine_mode +wider_subreg_mode (machine_mode outermode, machine_mode innermode) +{ + return partial_subreg_p (outermode, innermode) ? innermode : outermode; +} + +/* Likewise for subreg X. */ + +inline machine_mode +wider_subreg_mode (const_rtx x) +{ + return wider_subreg_mode (GET_MODE (x), GET_MODE (SUBREG_REG (x))); +} + extern unsigned int subreg_size_highpart_offset (unsigned int, unsigned int); /* Return the SUBREG_BYTE for an OUTERMODE highpart of an INNERMODE value. */ |