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| author | Richard Biener <rguenther@suse.de> | 2016-06-13 07:34:45 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2016-06-13 07:34:45 +0000 |
| commit | f57f53d3a5a0b18fdf5cef76247aed5f4b1e5610 (patch) | |
| tree | 67f378aa91a113aa2504bf2746b17d80db874e88 | |
| parent | f423253bd71fe25fc97e9aef002e33dd1619f0d4 (diff) | |
| download | gcc-f57f53d3a5a0b18fdf5cef76247aed5f4b1e5610.zip gcc-f57f53d3a5a0b18fdf5cef76247aed5f4b1e5610.tar.gz gcc-f57f53d3a5a0b18fdf5cef76247aed5f4b1e5610.tar.bz2 | |
re PR middle-end/64516 (arm: wrong unaligned load generated)
2016-06-13 Richard Biener <rguenther@suse.de>
PR middle-end/64516
* fold-const.c (fold_unary_loc): Preserve alignment when
folding a VIEW_CONVERT_EXPR into a MEM_REF.
* gcc.dg/align-3.c: New testcase.
From-SVN: r237355
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/fold-const.c | 2 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/align-3.c | 11 |
4 files changed, 24 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3ea7a01..690bd02 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2016-06-13 Richard Biener <rguenther@suse.de> + + PR middle-end/64516 + * fold-const.c (fold_unary_loc): Preserve alignment when + folding a VIEW_CONVERT_EXPR into a MEM_REF. + 2016-06-13 Martin Liska <mliska@suse.cz> PR sanitizer/71458 diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 7f8803c..1a464ec 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -7975,6 +7975,8 @@ fold_unary_loc (location_t loc, enum tree_code code, tree type, tree op0) case VIEW_CONVERT_EXPR: if (TREE_CODE (op0) == MEM_REF) { + if (TYPE_ALIGN (TREE_TYPE (op0)) != TYPE_ALIGN (type)) + type = build_aligned_type (type, TYPE_ALIGN (TREE_TYPE (op0))); tem = fold_build2_loc (loc, MEM_REF, type, TREE_OPERAND (op0, 0), TREE_OPERAND (op0, 1)); REF_REVERSE_STORAGE_ORDER (tem) = REF_REVERSE_STORAGE_ORDER (op0); diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index f324515..a596a54 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-06-13 Richard Biener <rguenther@suse.de> + + PR middle-end/64516 + * gcc.dg/align-3.c: New testcase. + 2016-06-13 Martin Liska <mliska@suse.cz> * gcc.target/i386/pr71458.c: New test. diff --git a/gcc/testsuite/gcc.dg/align-3.c b/gcc/testsuite/gcc.dg/align-3.c new file mode 100644 index 0000000..5c97d5a --- /dev/null +++ b/gcc/testsuite/gcc.dg/align-3.c @@ -0,0 +1,11 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-rtl-expand" } */ + +typedef struct { char a[2]; } __attribute__((__packed__)) TU2; +unsigned short get16_unaligned(const void *p) { + unsigned short v; + *(TU2 *)(void *)(&v) = *(const TU2 *)p; + return v; +} + +/* { dg-final { scan-rtl-dump "MEM\[^\n\r\]*A8\\\]" "expand" } } */ |