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| author | Eric Botcazou <ebotcazou@adacore.com> | 2017-01-11 11:27:43 +0000 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2017-01-11 11:27:43 +0000 |
| commit | 849fccf8312f734dddf4e3ea84eeabd2e243a10d (patch) | |
| tree | 293439ba584fbb7053bd43b36c0c1d62e28925c7 /gcc/lra-constraints.c | |
| parent | e325277522ec7a72286f1faa5bfb47f4b4be3d81 (diff) | |
| download | gcc-849fccf8312f734dddf4e3ea84eeabd2e243a10d.zip gcc-849fccf8312f734dddf4e3ea84eeabd2e243a10d.tar.gz gcc-849fccf8312f734dddf4e3ea84eeabd2e243a10d.tar.bz2 | |
re PR rtl-optimization/79032 (unaligned memory access generated with LRA and optimization)
PR rtl-optimization/79032
* lra-constraints.c (simplify_operand_subreg): In the MEM case, test
the alignment of the adjusted memory reference against that of MODE,
instead of the alignment of the original memory reference.
From-SVN: r244311
Diffstat (limited to 'gcc/lra-constraints.c')
| -rw-r--r-- | gcc/lra-constraints.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c index 5ada67a..7b0d2f4 100644 --- a/gcc/lra-constraints.c +++ b/gcc/lra-constraints.c @@ -1505,15 +1505,15 @@ simplify_operand_subreg (int nop, machine_mode reg_mode) MEM_ADDR_SPACE (subst)))) { /* If we change the address for a paradoxical subreg of memory, the - address might violate the necessary alignment or the access might - be slow. So take this into consideration. We need not worry + new address might violate the necessary alignment or the access + might be slow; take this into consideration. We need not worry about accesses beyond allocated memory for paradoxical memory subregs as we don't substitute such equiv memory (see processing equivalences in function lra_constraints) and because for spilled pseudos we allocate stack memory enough for the biggest corresponding paradoxical subreg. */ - if (!(MEM_ALIGN (reg) < GET_MODE_ALIGNMENT (mode) - && SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (reg))) + if (!(MEM_ALIGN (subst) < GET_MODE_ALIGNMENT (mode) + && SLOW_UNALIGNED_ACCESS (mode, MEM_ALIGN (subst))) || (MEM_ALIGN (reg) < GET_MODE_ALIGNMENT (innermode) && SLOW_UNALIGNED_ACCESS (innermode, MEM_ALIGN (reg)))) return true; |