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| author | Jakub Jelinek <jakub@redhat.com> | 2013-05-17 10:31:32 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2013-05-17 10:31:32 +0200 |
| commit | 52d8441318ecc69f8b63e6d2b595034f8245662f (patch) | |
| tree | fa001879de1e1721e6e595c1a4a3c784b7c0e612 | |
| parent | 17b962bd33aa88fbe170ffd67a5273d56350066e (diff) | |
| download | gcc-52d8441318ecc69f8b63e6d2b595034f8245662f.zip gcc-52d8441318ecc69f8b63e6d2b595034f8245662f.tar.gz gcc-52d8441318ecc69f8b63e6d2b595034f8245662f.tar.bz2 | |
re PR tree-optimization/57051 (Optimization regression in 4.8.0 from 4.7.2)
PR tree-optimization/57051
* fold-const.c (const_binop) <case VEC_LSHIFT_EXPR,
case VEC_RSHIFT_EXPR>: Fix BYTES_BIG_ENDIAN handling.
From-SVN: r199002
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/fold-const.c | 6 |
2 files changed, 11 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e47c760..e537c4b 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2013-05-17 Jakub Jelinek <jakub@redhat.com> + + PR tree-optimization/57051 + * fold-const.c (const_binop) <case VEC_LSHIFT_EXPR, + case VEC_RSHIFT_EXPR>: Fix BYTES_BIG_ENDIAN handling. + 2013-05-16 Nick Clifton <nickc@redhat.com> * config/rl78/rl78.c (rl78_attribute_table): Add naked. diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 97b5216..a2b7ac1 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -1393,7 +1393,11 @@ const_binop (enum tree_code code, tree arg1, tree arg2) if (shiftc >= outerc || (shiftc % innerc) != 0) return NULL_TREE; int offset = shiftc / innerc; - if (code == VEC_LSHIFT_EXPR) + /* The direction of VEC_[LR]SHIFT_EXPR is endian dependent. + For reductions, compiler emits VEC_RSHIFT_EXPR always, + for !BYTES_BIG_ENDIAN picks first vector element, but + for BYTES_BIG_ENDIAN last element from the vector. */ + if ((code == VEC_RSHIFT_EXPR) ^ (!BYTES_BIG_ENDIAN)) offset = -offset; tree zero = build_zero_cst (TREE_TYPE (type)); for (i = 0; i < count; i++) |