diff options
| author | Richard Sandiford <richard@codesourcery.com> | 2006-09-27 15:27:38 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2006-09-27 15:27:38 +0000 |
| commit | 63a7a62b25dcea2f63b2f50ee7502084ac8991f1 (patch) | |
| tree | ae805c7684178f9920bbee449d77cb2bf5c4d45b /gcc/reload1.c | |
| parent | 0d1187867f0c2f92dc4458ed0bffce479b1c11c0 (diff) | |
| download | gcc-63a7a62b25dcea2f63b2f50ee7502084ac8991f1.zip gcc-63a7a62b25dcea2f63b2f50ee7502084ac8991f1.tar.gz gcc-63a7a62b25dcea2f63b2f50ee7502084ac8991f1.tar.bz2 | |
reload1.c (alter_reg): Require the alignment of the stack slot to be at least reg_max_ref_width bytes.
gcc/
* reload1.c (alter_reg): Require the alignment of the stack slot to
be at least reg_max_ref_width bytes.
(scan_paradoxical_subregs): Record the largest width in
reg_max_ref_width.
From-SVN: r117252
Diffstat (limited to 'gcc/reload1.c')
| -rw-r--r-- | gcc/reload1.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index 58f77cb..4244b29 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -1996,8 +1996,11 @@ alter_reg (int i, int from_reg) && reg_equiv_memory_loc[i] == 0) { rtx x; + enum machine_mode mode = GET_MODE (regno_reg_rtx[i]); unsigned int inherent_size = PSEUDO_REGNO_BYTES (i); + unsigned int inherent_align = GET_MODE_ALIGNMENT (mode); unsigned int total_size = MAX (inherent_size, reg_max_ref_width[i]); + unsigned int min_align = reg_max_ref_width[i] * BITS_PER_UNIT; int adjust = 0; /* Each pseudo reg has an inherent size which comes from its own mode, @@ -2011,8 +2014,9 @@ alter_reg (int i, int from_reg) if (from_reg == -1) { /* No known place to spill from => no slot to reuse. */ - x = assign_stack_local (GET_MODE (regno_reg_rtx[i]), total_size, - inherent_size == total_size ? 0 : -1); + x = assign_stack_local (mode, total_size, + min_align > inherent_align + || total_size > inherent_size ? -1 : 0); if (BYTES_BIG_ENDIAN) /* Cancel the big-endian correction done in assign_stack_local. Get the address of the beginning of the slot. @@ -2028,7 +2032,8 @@ alter_reg (int i, int from_reg) else if (spill_stack_slot[from_reg] != 0 && spill_stack_slot_width[from_reg] >= total_size && (GET_MODE_SIZE (GET_MODE (spill_stack_slot[from_reg])) - >= inherent_size)) + >= inherent_size) + && MEM_ALIGN (spill_stack_slot[from_reg]) >= min_align) x = spill_stack_slot[from_reg]; /* Allocate a bigger slot. */ @@ -2036,7 +2041,6 @@ alter_reg (int i, int from_reg) { /* Compute maximum size needed, both for inherent size and for total size. */ - enum machine_mode mode = GET_MODE (regno_reg_rtx[i]); rtx stack_slot; if (spill_stack_slot[from_reg]) @@ -2046,11 +2050,14 @@ alter_reg (int i, int from_reg) mode = GET_MODE (spill_stack_slot[from_reg]); if (spill_stack_slot_width[from_reg] > total_size) total_size = spill_stack_slot_width[from_reg]; + if (MEM_ALIGN (spill_stack_slot[from_reg]) > min_align) + min_align = MEM_ALIGN (spill_stack_slot[from_reg]); } /* Make a slot with that size. */ x = assign_stack_local (mode, total_size, - inherent_size == total_size ? 0 : -1); + min_align > inherent_align + || total_size > inherent_size ? -1 : 0); stack_slot = x; /* All pseudos mapped to this slot can alias each other. */ @@ -3828,7 +3835,8 @@ scan_paradoxical_subregs (rtx x) case SUBREG: if (REG_P (SUBREG_REG (x)) - && GET_MODE_SIZE (GET_MODE (x)) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) + && (GET_MODE_SIZE (GET_MODE (x)) + > reg_max_ref_width[REGNO (SUBREG_REG (x))])) reg_max_ref_width[REGNO (SUBREG_REG (x))] = GET_MODE_SIZE (GET_MODE (x)); return; |